CN109431460A - A kind of flexible high flexible nanofiber covering yarn strain gauge with pleated structure and preparation method thereof - Google Patents
A kind of flexible high flexible nanofiber covering yarn strain gauge with pleated structure and preparation method thereof Download PDFInfo
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- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0069—Electro-spinning characterised by the electro-spinning apparatus characterised by the spinning section, e.g. capillary tube, protrusion or pin
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/441—Yarns or threads with antistatic, conductive or radiation-shielding properties
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0247—Pressure sensors
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
- D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/10—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes
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Abstract
The invention discloses a kind of flexible high flexible nanofiber covering yarn strain gauges with pleated structure and preparation method thereof.The heart yarn elastomeric matrices flexible as height are used as using high-performance elastic long filament, electrostatic spinning nano fiber is then coated on the elastic filament surface that prestretching extends to certain length by conjugation electrostatic spinning technique and prepares continuous nanofiber covering yarn.By liquid polymerization method in situ in shell nanofiber surface polymerization one layer of conductive polymer polypyrrole of cladding of covering yarn, one layer of gel mould for having conductive copper wire finally is coated in yam surface, obtains strain gauge, and be applied on wearable electronic skin.When being stretched, be bent and when the outside stimulus such as pressure, this nano-fibre yams strain gauge not only has preferable mechanics self-adaptability, it is shown that the sensitivity of superelevation and wider sensing scope., it can be achieved that the limb motion from the rhythm of the heart of faint stress variation to larger stress variation monitors in human body monitoring system.
Description
Technical field
The invention belongs to flexible sensor technical fields, are related to a kind of flexible high flexible Nanowire with pleated structure
Tie up covering yarn strain gauge and preparation method thereof, and in particular to a kind of to utilize electrostatic spinning technique and liquid deposition polymerization technique
The flexible high flexible nanofiber cored yarn sensor with pleated structure of preparation, is applied to human body health monitoring system.
Background technique
Various mechanical stimulus can be transmitted to brain from external environment by human skin.This function is realized in artificial skin
Can create advanced anthropomorphic robot, biomedical prosthese, the key of perform the operation electronic gloves and wearable health supervision device.
In order to imitate the property of human skin, artificial skin should have measurement by such as normal pressure, and transverse strain and buckling etc. are more
The ability of the spatial distribution of stress caused by kind mechanical stimulus, in order to grasp control and record body kinematics, second, it can stretch
Contracting is the key property of artificial skin, it is ensured that it adaptively covers any bending and mobile surface, such as robot
The joint of arm, and bear to repeat and extended mechanically deform, such as bending and distortion, third, in order to realize that artificial skin exists
Extensive use in daily life, artificial skin should be compatible with large area preparation, lower cost for material.In the past decade, it is based on
The development of the artificial skin of array of pressure sensors on flexible base board has been achieved for very big progress, has high sensitivity,
Fast-response speed and the resolution ratio of tactile mapping etc., but have a long way to go with human skin, these array of pressure sensors lack
Tensility can only provide the function of space pressure distributed intelligence.In order to solve these problems, essential retractable material is selected
New construction design sensor is the available strategy that manufacture has the sensitive and scalable mechanical pick-up device of multiple machine power, therefore is set
Count that a kind of compact, flexibility are good and high flexible hypersensitive nanofiber covering yarn strain gauge is to solve the above problems
Key.
Static Spinning be one kind be simple and efficient, most attractive nanotechnology.The nanometer prepared using electrostatic spinning technique
Fiber shows preferable applicability more multi-field because size is small, voidage is high and large specific surface area.Therefore, originally
Invention is used as the heart yarn elastomeric matrices flexible as height using high-performance elastic long filament, is existed first by being conjugated electrostatic spinning technique
The elastic filament surface cladding electrostatic spinning nano fiber that prestretching extends to certain length prepares continuous nanofiber covering yarn, discharges
The nanofiber covering yarn with pleated structure is obtained after the elastic filament (heart yarn) of pre-stretching.Then in the Nanowire of covering yarn
One layer of conducting polymer of surface grafting is tieed up, the gel mould of conductive copper wire is finally had in the surface recombination of yarn, is obtained flexible high
The flexible nanofiber covering yarn strain gauge with pleated structure, and be applied on wearable electronic skin.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of flexible high flexible yarn with pleated structure
The preparation method of strain gauge.The heart yarn elastomeric matrices flexible as height are used as using high-performance elastic long filament, are then passed through
Conjugation electrostatic spinning technique is continuous in the elastic filament surface cladding electrostatic spinning nano fiber preparation that prestretching extends to certain length
Nanofiber covering yarn.Since the rigidity between nanofiber and high flexible elastic filament mismatches, the bullet of pre-stretching is discharged
Property long filament can obtain the nanofiber covering yarn with periodical pleated structure.On this basis, pass through liquid phase polymerization side in situ
Method finally coats one layer in yam surface and has in shell nanofiber surface polymerization one layer of conducting polymer of cladding of covering yarn
The gel mould of conductive copper wire obtains the flexible high flexible nanofiber covering yarn strain gauge with pleated structure, and answers
For wearable electronic skin.When being stretched, be bent and when the outside stimulus such as pressure, this nano fibre yarn uniaxial stress
Sensor not only has preferable mechanics self-adaptability, but also shows the stress sensitivity and wider sensing model of superelevation
It encloses., it can be achieved that the limb motion from the rhythm of the heart of faint stress variation to larger stress variation is supervised in human body monitoring system
It surveys.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of flexible high flexible nanofiber cored yarn sensor with pleated structure, it is by electrostatic spinning nano fiber packet
Overlay on the nanofiber covering yarn with pleated structure that high flexible elastic filament surface is constituted.Specifically use high-performance bullet
Property long filament be used as heart yarn as high flexible elastomeric matrices, then extend to certain length in prestretching by being conjugated electrostatic spinning technique
Elastic filament surface cladding electrostatic spinning nano fiber prepare continuous nanofiber covering yarn.Since nanofiber and height are flexible
Elastic filament between rigidity mismatch, the elastic filament for discharging pre-stretching can obtain the nanometer with periodical pleated structure
Fabric core-spun yarn.On this basis, the shell nanofiber surface by liquid polymerization method in situ in covering yarn polymerize cladding
One layer of conducting polymer finally coats one layer of gel mould for having conductive copper wire in yam surface, obtains flexible high flexible tool
There is the nanofiber covering yarn strain gauge of pleated structure.
The elongation of the high telescopic resilience long filament is more than or equal to 100%, and the diameter of elastic filament is 60-500 μm.
The nanofiber is made of high molecular polymer, the diameter 100-900 nm of nanofiber.
The polymer is the one or more of Kynoar (PVDF), polyurethane (PU), polyacrylonitrile (PAN),
The molecular weight of polymer is more than or equal to 100000.
The diameter of the nanofiber covering yarn is 60-500 μm, and elongation is more than or equal to 0.01%.The gel
Film is polydimethylsiloxane (PDMS) film, thickness 0.01-10 mm.The brass wire diameter is 0.1-10 mm.
The flexible high flexible nanofiber covering yarn strain gauge with pleated structure of the invention uses following steps:
(1) high molecular polymer is dissolved in N, N-dimethylformamide (DMF) or N, N-dimethylformamide (DMF) and tetrahydro furan
The in the mixed solvent muttered stirs 1-10 h at 30-100 DEG C and obtains the polymer solution that mass fraction is 8%-30%；
(2) 1 electrostatic spinning apparatus is built as illustrated, first unwinds elastic filament from unwinding device, pass through metal loudspeaker
Mouth is wound up on winding device.The ratio of the winding speed of the withdrawal speed and winding device of unwinding device is 0-1.It then will step
Suddenly the spinning solution in (1), which is added in syringe pump, prepares continuous nanofiber composite yarn.Electrostatic spinning voltage is 14-22
KV, spinning solution total flow are 0.5-0.9 mL/h, and the diameters of metal loudspeaker is 10-20cm, metal loudspeaker and winding device
Vertical range is 40-60cm, and the vertical range of spray head and metal loudspeaker is 4-8cm, and the horizontal distance of spray head and metal loudspeaker is
3-5cm, the number of spray head are 2-16, spray head internal diameter 0.26-0.86 mm, positive and negative spray head liquid inventory ratio 1:0.5-1, positive and negative
Distance 13-17.5 cm, winding speed 10-1000 mm/min between spray head.
(3) the nanofiber covering yarn prepared in step (2) is unwound from winding device, is rewound to another volume
On winding apparatus.The ratio of the withdrawal speed of the winding speed and unwinding device of winding device is 0-1, it is ensured that is prepared during unwinding
Nanofiber covering yarn in heart yarn (elastic filament) be restored to just beginning and end elongation state, so that being formed has pleated structure
Nanofiber covering yarn.
(4) the nanofiber covering yarn with pleated structure prepared in step (3) is immersed in concentration is 30-100
Ferric trichloride (the FeCl of mol/L3) 30-100 min in solution；
(5) the nanofiber covering yarn in step (4) is immersed in pyrroles (Py) solution that concentration is 30-100 mol/L, it is low
1-5 h under warm (0-4 DEG C), is cleaned after taking-up with deionized water, is subsequently placed in 30-90 DEG C of vacuum drying oven dry；
(6) the nanofiber covering yarn surface coating in step (5) is had to the gel mould dimethyl silicone polymer of conductive copper wire
(PDMS) film obtains nano-fibre yams strain gauge.
Beneficial effects of the present invention: (1) present invention is using electrostatic spinning technique in the elastic filament with high scalability energy
Surface coats the nanofiber covering yarn that nanofiber preparation has pleated structure, obtains the nanofiber with larger elongation
Covering yarn.(2) the nanofiber covering yarn strain gauge prepared by the present invention has sensitive with more power are bent to pressure, stretching
Performance, be provided simultaneously with that high sensitivity, fast response time, conductivity are high, can bear the features such as range of strain is wide, stability is good.
(3) prepare nanofiber covering yarn strain gauge have preferable mechanics self-adaptability, it can be achieved that truly can
Dress sensor.
Detailed description of the invention
Fig. 1 is electrostatic spinning apparatus schematic diagram, and 1 winding device, 2 spray heads, 3 syringe pumps, 4 metal loudspeaker, 5 high pressures occur
Device, 51 anodes, 52 cathode；
Fig. 2 is nanofiber covering yarn strain gauge structural schematic diagram, 6 copper conductors, 7 PDMS elastic membranes, 8 nanofiber packets
Heart yarn；
Fig. 3 has the nanofiber covering yarn of pleated structure and the SEM picture of single fiber；
In Fig. 4 embodiment 1 under different pressures nanofiber covering yarn strain gauge sensitivity.
Specific embodiment
Combined with specific embodiments below, the present invention will be further described.It should be understood that following embodiment is merely to illustrate this
The person skilled in the art of the range of invention and is not intended to limit the present invention, the field can make one according to the content of foregoing invention
A little nonessential modifications and adaptations.
Embodiment 1
The preparation method of the high flexible nanofiber covering yarn strain gauge with pleated structure of the flexibility of the present embodiment is such as
Under:
(1) polyacrylonitrile (PAN) is dissolved in n,N dimethylformamide (DMF) solvent, 6 h is stirred at 80 DEG C and obtain matter
Measure the PAN solution that score is 8%；
(2) 1 electrostatic spinning apparatus is built as illustrated, the PAN solution in step (1) is added in syringe pump and is prepared continuously
Nano-fibre yams, the elongation of elastic filament are equal to 100%, and electrostatic spinning voltage is 17.5 kV, and spinning solution total flow is
0.6 mL/h, the diameters of metal loudspeaker are 10 cm, and the vertical range of metal loudspeaker and winding device is 50 cm, spray head and gold
Belong to the vertical range of loudspeaker for 4 cm, the horizontal distance of spray head and metal loudspeaker is 3 cm, and the number of spray head is 4, in spray head
Diameter 0.4 mm, positive and negative spray head liquid inventory ratio 2:1,17 cm of distance, 50 mm/min of winding speed between positive and negative spray head；
(3) the nanofiber covering yarn prepared in step (2) is immersed in the ferric trichloride (FeCl that concentration is 50 mol/L3) molten
30 min in liquid；
(4) the nanofiber covering yarn in step (3) is immersed in low temperature (0- in pyrroles (Py) solution that concentration is 50 mol/L
4 DEG C) under 3 h, cleaned after taking-up with deionized water, be subsequently placed in 60 DEG C of vacuum drying oven dry, obtain the nanometer of PPy PAN
Fabric core-spun yarn；
(5) the nanofiber covering yarn surface recombination in step (4) is had to the dimethyl silicone polymer (PDMS) of conductive copper wire
Film obtains PPy@PAN nano-fibre yams strain gauge.
(6) the PPy@PAN nano-fibre yams strain gauge prepared in step (5) is stretched to different length, can obtained
It obtains and stretches sensitivity accordingly, as shown in the figure, it is shown that higher sensitivity and the wider stretching range of sensitivity.
Embodiment 2
The preparation method of the high flexible nanofiber covering yarn strain gauge with pleated structure of the flexibility of the present embodiment is such as
Under:
(1) Kynoar (PVDF) is dissolved in N, the in the mixed solvent (matter of N-dimethylformamide (DMF) and tetrahydrofuran
Amount is than being 1:1), 6 h are stirred at 80 DEG C obtains the PVDF solution that mass fraction is 16.5%；
(2) 1 electrostatic spinning apparatus is built as illustrated, the spinning solution in step (1) is added in syringe pump and is prepared continuously
Nano-fibre yams, the elongation of elastic filament is equal to 150%, and electrostatic spinning voltage is 17.5 kV, spinning solution total flow
For 0.6 mL/h, the diameter of metal loudspeaker is 10 cm, and the vertical range of metal loudspeaker and winding device is 50 cm, spray head with
The vertical range of metal loudspeaker is 4 cm, and the horizontal distance of spray head and metal loudspeaker is 3 cm, and the number of spray head is 4, spray head
Internal diameter 0.4 mm, positive and negative spray head liquid inventory ratio 2:1,17 cm of distance, 50 mm/min of winding speed between positive and negative spray head；
(3) the nanofiber covering yarn prepared in step (2) is immersed in the ferric trichloride (FeCl that concentration is 30 mol/L3) molten
50 min in liquid；
(4) the nanofiber covering yarn in step (3) is immersed in low temperature (0- in pyrroles (Py) solution that concentration is 30 mol/L
4 DEG C) under 4 h, cleaned after taking-up with deionized water, be subsequently placed in 60 DEG C of vacuum drying oven dry, obtain receiving for PVDF PPy
Rice fabric core-spun yarn；
(5) the nanofiber covering yarn surface recombination in step (4) is had to the dimethyl silicone polymer (PDMS) of conductive copper wire
Film obtains the nano-fibre yams strain gauge of PVDF@PPy.
Embodiment 3
The preparation method of the high flexible nanofiber covering yarn strain gauge with pleated structure of the flexibility of the present embodiment is such as
Under:
(1) polyurethane (PU) is dissolved in N, (mass ratio is for the in the mixed solvent of N-dimethylformamide (DMF) and tetrahydrofuran
1:1), 8 h are stirred under room temperature obtains the PU solution that mass fraction is 12%；
(2) 1 electrostatic spinning apparatus is built as illustrated, the spinning solution in step (1) is added in syringe pump and is prepared continuously
Nano-fibre yams, the elongation of elastic filament is equal to 200%, and electrostatic spinning voltage is 20 kV, and spinning solution total flow is
0.6 mL/h, the diameters of metal loudspeaker are 10 cm, and the vertical range of metal loudspeaker and winding device is 50 cm, spray head and gold
Belong to the vertical range of loudspeaker for 4 cm, the horizontal distance of spray head and metal loudspeaker is 3 cm, and the number of spray head is 4, in spray head
Diameter 0.4 mm, positive and negative spray head liquid inventory ratio 2:1,17 cm of distance, 50 mm/min of winding speed between positive and negative spray head；
(3) the nanofiber covering yarn prepared in step (2) is immersed in the ferric trichloride (FeCl that concentration is 75 mol/L3) molten
70 min in liquid；
(4) the nanofiber covering yarn in step (3) is immersed in low temperature (0- in pyrroles (Py) solution that concentration is 75 mol/L
4 DEG C) under 1 h, cleaned after taking-up with deionized water, be subsequently placed in 60 DEG C of vacuum drying oven dry, obtain the nanometer of PU PPy
Fabric core-spun yarn；
(5) the nanofiber covering yarn surface recombination in step (4) is had to the dimethyl silicone polymer (PDMS) of conductive copper wire
Film obtains the nano-fibre yams strain gauge of PU@PPy.
(6) the PPy@PAN nano-fibre yams strain gauge prepared in step (5) is woven into fabric, passes through application
Different pressures can get corresponding pressure-sensitivity.
Embodiment 4
The preparation method of the high flexible nanofiber covering yarn strain gauge with pleated structure of the flexibility of the present embodiment is such as
Under:
(1) polyurethane (PU) is dissolved in N, (mass ratio is for the in the mixed solvent of N-dimethylformamide (DMF) and tetrahydrofuran
1:1), 8 h are stirred under room temperature obtains the PU solution that mass fraction is 12%；
(2) 1 electrostatic spinning apparatus is built as illustrated, the spinning solution in step (1) is added in syringe pump and is prepared continuously
Nano-fibre yams, the elongation of elastic filament is equal to 200%, and electrostatic spinning voltage is 20 kV, and spinning solution total flow is
0.6 mL/h, the diameters of metal loudspeaker are 10 cm, and the vertical range of metal loudspeaker and winding device is 50 cm, spray head and gold
Belong to the vertical range of loudspeaker for 4 cm, the horizontal distance of spray head and metal loudspeaker is 3 cm, and the number of spray head is 4, in spray head
Diameter 0.4 mm, positive and negative spray head liquid inventory ratio 2:1,17 cm of distance, 50 mm/min of winding speed between positive and negative spray head；
(3) the nanofiber covering yarn prepared in step (2) is immersed in the ferric trichloride (FeCl that concentration is 75 mol/L3) molten
70 min in liquid；
(4) the nanofiber covering yarn in step (3) is immersed in low temperature (0- in pyrroles (Py) solution that concentration is 75 mol/L
4 DEG C) under 1 h, cleaned after taking-up with deionized water, be subsequently placed in 60 DEG C of vacuum drying oven dry, obtain the nanometer of PU PPy
Fabric core-spun yarn；
(5) the nanofiber covering yarn surface recombination in step (4) is had to the dimethyl silicone polymer (PDMS) of conductive copper wire
Film obtains the nano-fibre yams strain gauge of PU@PPy.
(6) the PPy@PAN nano-fibre yams strain gauge prepared in step (5) is bent to different angle, can be obtained
Obtain corresponding Bending Sensitivity.
Therefore, flexible high flexible nano-fibre yams strain gauge prepared by the present invention, it is larger based on nanofiber
Specific surface area and the excellent performance characteristics of material, when being stimulated by external force, flexible high flexible nano-fibre yams are answered
Force snesor show superelevation sensitivity and wider sensing scope.In human body monitoring system, it can be achieved that from faint pressure
The limb motion of the rhythm of the heart of power to larger pressure monitors.In addition, manufacture craft is easy, low in cost, be conducive to big rule
Mould commercialization direction is developed.
Basic principles and main features and advantages of the present invention of the invention have been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (8)
1. a kind of flexible high flexible nanofiber covering yarn strain gauge with pleated structure, it is characterised in that: it is
It is twisted by electrostatic spinning nano fiber and forms nano-fibre yams, it is poly- then to coat one layer of conduction in nano-fibre yams surface aggregate
Object is closed, the gel mould by the surface recombination in yarn with conductive copper wire obtains flexible high flexible receiving with pleated structure
Rice fabric core-spun yarn strain gauge.
2. strain gauge according to claim 1, it is characterised in that: the nanofiber is by high molecular polymer structure
At the diameter of nanofiber is 100-900nm.
3. strain gauge according to claim 2, it is characterised in that: the high molecular polymer be Kynoar,
Polyurethane and polyacrylonitrile, molecular weight >=100000 of polymer.
4. strain gauge according to claim 1, it is characterised in that: the diameter of the nano-fibre yams is 60-
500μm。
5. strain gauge according to claim 1, it is characterised in that: the gel mould is dimethyl silicone polymer
Film, with a thickness of 0.01-10 mm.
6. strain gauge according to claim 1, it is characterised in that: the brass wire diameter is 0.1-10 mm.
7. the preparation method of -6 any strain gauges according to claim 1, it is characterised in that sequentially include the following steps:
(1) high molecular polymer is dissolved in N, N-dimethylformamide or N, the mixing of N-dimethylformamide and tetrahydrofuran is molten
In agent, 1-10 h is stirred at 30-100 DEG C and obtains the polymer solution that mass fraction is 8%-30%；
(2) electrostatic spinning apparatus is built, the spinning solution in step (1) is added in syringe pump and prepares continuous nanofiber
Composite yarn；
(3) the nanofiber covering yarn prepared in step (2) is immersed in the ferric trichloride that concentration is 30-100 mol/L
(FeCl3) 30-100 min in solution；
(4) the nanofiber covering yarn in step (3) is immersed in pyrroles (Py) solution that concentration is 30-100 mol/L,
1-5 h is impregnated at 0-4 DEG C, is cleaned after taking-up with deionized water, is subsequently placed in 30-90 DEG C of vacuum drying oven dry；
(5) gel mould that the nanofiber covering yarn surface coating in step (4) is had to conductive copper wire, obtains nano fibre yarn
Uniaxial stress sensor.
8. the preparation method of strain gauge according to claim 7, it is characterised in that: step (2) preparation is continuous
Nanofiber composite yarn when, elongation >=100% of elastic filament, electrostatic spinning voltage is 14-22 kV, and spinning solution is total
Flow is 0.5-0.9 mL/h, and the diameters of metal loudspeaker is 10-20cm, and the vertical range of metal loudspeaker and winding device is 40-
60cm, the vertical range of spray head and metal loudspeaker are 4-8cm, and the horizontal distance of spray head and metal loudspeaker is 3-5cm, the number of spray head
Mesh is 2-16, spray head internal diameter 0.26-0.86 mm, positive and negative spray head liquid inventory ratio 1:0.5-1, the distance 13- between positive and negative spray head
17.5 cm, winding speed 40-53mm/min.
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