JP4664282B2 - 真空蒸着により機能化された多孔性材料 - Google Patents
真空蒸着により機能化された多孔性材料 Download PDFInfo
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- JP4664282B2 JP4664282B2 JP2006513264A JP2006513264A JP4664282B2 JP 4664282 B2 JP4664282 B2 JP 4664282B2 JP 2006513264 A JP2006513264 A JP 2006513264A JP 2006513264 A JP2006513264 A JP 2006513264A JP 4664282 B2 JP4664282 B2 JP 4664282B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D1/60—Deposition of organic layers from vapour phase
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- B05D1/62—Plasma-deposition of organic layers
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- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0493—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases using vacuum
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
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- C23C8/20—Carburising
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
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- D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
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- D06M14/22—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin of vegetal origin, e.g. cellulose or derivatives thereof
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- D06M14/24—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of natural origin of animal origin, e.g. wool or silk
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
- B05D3/144—Pretreatment of polymeric substrates
Description
本発明は、概して、材料の性質を特定の用途に合わせて向上させる目的で材料表面を機能化することに関する。本発明は、詳細には、紙、膜、並びに他の織物状及び不織の多孔性材料を機能化するためのプラズマ処理と蒸気蒸着工程との組み合わせに関する。
「機能化」という言葉及びそれに関連した用語は本発明の分野で使用されており、本明細書では、特定用途の特定要件を満足するように材料を処理することで、その表面性質を変化させる工程をいう。例えば、材料の表面エネルギーを処理して、所与の用途に望ましくなるように特に疎水性又は親水性とすることができる。従って、表面の機能化は最終製品に付加価値を与えるので、多くの材料の製造で一般的に実施されるようになった。こうした異なる最終効果を得るため、機能化は、湿式分析から様々な様態の蒸気蒸着、真空金属被覆、及びスパッタリングに至る様々な方法で実行できる。
メルトブローン・ポリプロピレン不織織物を疎水性/疎油性のフッ化アクリレート・ポリマー被覆により機能化し、撥水(油)表面を形成した。このモノマーを約100ミリトールでフラッシュ蒸発させた。この織物をプラズマ場で前処理し、次に1秒以内に約50m/分の速度で移動させつつ、凝結させるためモノマー蒸気に曝露した。凝結したモノマー層は、100ミリ秒以内に電子ビーム照射によりインラインで硬化させた。この処理段階から約0.1μmのポリマー被覆厚さが得られるが、これが約27ダイン/cmの表面エネルギーを備えた水及び油には十分な疎水性及び疎油性を提供することが分かった。この機能化した織物は、水性及び油性流体をはじく一方、それが元々持つ透過性は概ね保持した。この被覆材料は、静電濾過材として高性能を発揮した。同じフルオロアクリレート・モノマーを用いた同じ被覆工程を、不織ポリエチレン、紙、フルオロポリマー、ポリエステル繊維、ナイロン繊維、レイヨン繊維、ウール織物、及び綿織物でも繰り返した。この機能化モノマーを、0.02乃至3.0μmの範囲の厚さで蒸着した全ての種類の織物材料について、同様の撥水性/撥油性が得られた。疎水性及び疎油性に加え、この被覆された材料は低い摩擦係数を示し、被覆された繊維では絹様の手触りとなった。速度を速くした(200メートル/分)の同様の実験では、機能化被覆は織物材料の露出した表面に限定されていた。被覆されたウェブの裏面は元々の性質を保持していた。(ウェブの片面のみを選択的に被覆するオプションは、本発明による工程の更なる独自の特徴である。)図6に示したように(左中央側)、これら被覆配合は、これら織物に所望の撥水/油性を与え、処理した織物の撥油性は、10回の洗浄サイクルを経ても実質的に変化しなかった。
メルトブローン・ポリプロピレン不織織物を、ヒドロキシル、カルボキシル、スルホン酸、アミノ、アミド及びエーテル基で機能化した親水性アクリレート・ポリマー被膜により被覆し、吸水性表面を作製した。このモノマーを約10ミリトールでフラッシュ蒸発させた。この織物をプラズマ場で前処理し、1秒以内に約30m/分の速度で移動させつつ、凝結させるためモノマー蒸気に曝露した。凝結したモノマー層は、150ミリ秒以内に電子ビーム照射によりインラインで硬化させた。この処理段階で約0.1μmのポリマー被覆厚さが得られるが、これは、約70乃至72ダイン/cmの表面エネルギーの水に関して十分な湿潤性を提供することが分かった。この機能化した織物は水を吸収する一方、それが元々持つ透過性は概ね保持した。この被覆材料は、水吸収媒体として高性能を発揮した。同じ親水性アクリレート・モノマーを用いた同じ被覆工程を、不織ポリエチレン、フルオロポリマー、ポリエステル繊維、及びフルオロポリマー織物でも繰り返した。厚さが0.1乃至3.0μmの範囲のモノマー層を備えた全ての種類の織物材料に関して同様の結果が得られた。速度を速くした(200メートル/分)の同様の実験では、機能化被覆は織物材料の露出した表面に限定されていた。被覆されたウェブの裏面は、元々の性質を保持していた。図6は、上述したように、被覆の前後における、実施例で使用した不織ポリプロピレン濾過材の表面での水試験を示す。被覆前に、この材料は図の右下に示したように疎水性であった。本発明による機能化の後、織物に吸収された水滴により図の右上部分で示したように、この材料は明確に親水性となった。従って、これら被覆基材を、おむつ、フィルタ、電池セパレーター、及びイオン移動膜として有利に使用できる。下の表3は、2つの親水性アクリレートを基剤とした配合で被覆した不織ポリプロピレンに関する3回の水撃(原語:water-strike)試験を示す。フィルタ紙は吸収性が高いことが知られているが、これを対照標準材料として用いた(未処理のおむつ材料であるポリプロピレンは疎水性であることが知られているので)。
3乃至5%の有機染料(例えば、赤の分散染料)をフッ化アクリレート・モノマー中に混合して、実施例1と同じ実験を繰り返した。被覆した基材は、上述の染料を被覆に付加した状態で、同レベルの撥水性及び撥油性を示し、デュポン(登録商標)社のテフロン(登録商標)撥水/撥油性(原語:repellency)試験でそれぞれ約6と5が測定された。色の純度は、有機染料の量又は被覆の厚みを監視することで調節できる。
親水性アクリレート・モノマー中に3乃至5%の有機染料(例えば、マラカイトグリーン)を混合して、実施例2と同じ実験を繰り返した。この被覆基材は、同程度の高い吸水性を備えた着色表面となった。
2乃至4%の有機抗菌性添加物(例えば、塩素化芳香族化合物)をフッ化アクリレート・モノマー中に入れて、実施例1と同じ実験を繰り返した。この被覆基材は、後述するように抗菌性を備えた撥水性及び撥油性を示した。
3乃至5%の有機抗菌性添加物(例えば、塩素化芳香族化合物)を親水性アクリレート・モノマー中に入れて、実施例2と同じ実験を繰り返した。この被覆基材は、抗菌性及び高い吸水性を示した。
5乃至20%の臭素化化合物をジアクリレート・モノマー中に入れて、実施例1及び2と同じ実験を繰り返した。被覆基材は、実施例1及び2と同程度の疎水性/疎油性及び親水性を備える一方、耐火性を示した。
5乃至20%の、フェノール・フタレイン(原語:phthaleine)のようなpH指示薬化合物をジアクリレート・モノマー中に入れて、実施例1及び2と同じ実験を繰り返した。得られた被覆基材は、環境のpHにおける変化に合わせて可逆的に変色した。温度が摂氏約50度に達すると透明から灰色へと変色する、4−ペンチルー4−シアノビフェニルなどの感熱性分子を5乃至30%用いて同じ実験を繰り返した。この被覆材料は、環境の温度変化に合わせて変色した。
5乃至20%の合成フルーツ風味化合物をジアクリレート・モノマー中に入れて、実施例1及び2と同じ実験を繰り返した。例えば、4−(2,6,6−トリメチル−1−シクロヘキセン−1−基)−3−ブテン−2−1がイチゴ風味を出すため使われている。被覆基材は、実施例1及び2と同等の疎水性/疎油性及び親水性に加え、目的とする果物の香りを示した。
実施例1及び2と同様の実験をより低速(100フィート/分未満)で繰り返して、モノマー蒸気を紙材料の繊維を完全に透過させ、個別繊維の使用可能な全表面を被覆させた(材料の多孔度は維持した)。得られた被覆紙は、実施例1及び2と同等の疎水性/疎油性及び親水性に加え、高い湿潤引張強さを示した。
被覆の架橋及び密度を増加し、結果的に耐化学性を増強するため、5乃至40%のトリアクリレート・モノマーを含んだモノマーを用いて実施例1及び2と同様の実験を繰り返した。被覆基材は、実施例1及び2と同等の疎水性/疎油性及び親水性を保持する一方、トリアクリレート・モノマーの付加により、酸性溶液及び基礎液に加え有機溶剤に対する耐化学性が増強したことを示した。
10乃至20%のアクリレート化アセチルアセトネート(原語:acrylated acetyl acetonate)モノマーをジアクリレート・モノマー中に入れて、実施例2と同じ実験を繰り返した。この被覆基材は、金属イオン(例えば、Cu、Pb、Cr)に結合することで金属キレート化特性を示した。従って、これらは、水から金属イオンを除去する濾過材となることが試験により示された。
上述の実施例と同様に、多孔性ポリプロピレン及びフルオロポリマーを硫酸化化合物モノマーで被覆し、その後、電子ビームで硬化させた。被覆基材はプロトン伝導性を示し、燃料電池膜としての使用可能性が示された。
上述の実施例と同様に、多孔性ポリプロピレン及びフルオロポリマー被膜を、スルホン酸リチウム(原語:lithium sulfonate)を形成するため金属リチウムで共蒸着した(原語:co-deposited)硫酸化化合物で被覆し、その後、電子ビームで硬化させた。被覆基材はリチウム・イオン伝導性を示し、電池セパレーター及び電解質としての使用可能性が示された。
Claims (42)
- 透過性を維持しつつ、特定の機能性を与えるために透過孔壁を有する多孔性基材を機能化する工程であって、
(a)前記基材をプラズマ場で前処理する段階と、
(b)真空チャンバ内で前記機能性を備えたモノマーをフラッシュ蒸発させて、蒸気を発生させる段階と、
(c)前記多孔性基材の前記孔壁を被覆している前記モノマーの被膜を形成するため、前記前処理する段階の1秒以内に前記多孔性基材に前記蒸気を凝結させる段階と、
(d)前記多孔性基材の前記孔壁に機能化された高分子層を形成するため前記被膜を硬化させる段階とを含み、
前記凝結させる段階が、前記高分子層を最大で3.0μmの厚さに制限する蒸気密度及び滞在時間の条件下で実行される、工程。 - 無機物層を前記高分子層上に真空蒸着する段階を更に含む、請求項1に記載の工程。
- 前記無機物層が、金属及びセラミックからなるグループから選択される、請求項2に記載の工程。
- モノマーをフラッシュ蒸発させ、前記無機物層に当該モノマーの第2被膜を凝結させる段階と、前記無機物層に第2高分子層を形成するため、前記第2被膜を硬化させる更なる段階とを含む、請求項2に記載の工程。
- モノマーをフラッシュ蒸発させ、前記無機物層に当該モノマーの第2被膜を凝結させる段階と、前記無機物層に第2高分子層を形成するため、前記第2被膜を硬化させる更なる段階とを含む、請求項3に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが、撥水性及び撥油性機能を提供するフッ化モノマーである、請求項1に記載の工程。
- 前記モノマーが着色添加物を含む、請求項6に記載の工程。
- 前記モノマーが殺生物添加物を含む、請求項6に記載の工程。
- 前記モノマーが難燃性機能を提供する臭素化モノマーを含む、請求項6に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、ポリエステル、ナイロン、レイヨン、紙、綿、ウール、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが、親水性機能を提供するヒドロキシル、カルボキシル、スルホン酸、アミノ、アミド、又はエーテルからなるグループから選択される官能基で機能化される、請求項1に記載の工程。
- 前記モノマーが着色添加物を含む、請求項10に記載の工程。
- 前記モノマーが殺生物添加物を含む、請求項10に記載の工程。
- 前記モノマーが難燃性機能を提供する臭素化物質を含む、請求項10に記載の工程。
- 前記モノマーが、金属キレート化機能を提供するアクリレート化アセチルアセトネート・モノマーを含む、請求項10に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、綿、ウール、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが、プロトン伝導性機能を提供するスルホン酸基である、請求項1に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーがスルホン酸基を含み、イオン伝導性機能を備えた高分子電解質を提供するため、前記硬化段階に先だって前記モノマー上に金属リチウムを共蒸着する段階を更に含む、請求項1に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含む、請求項2に記載の工程。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含む、請求項4に記載の工程。
- 機能化された多孔性基材であって、
前記基材をプラズマ場で前処理する段階と、
蒸気を発生させるため真空チャンバ内で所望の機能性を備えたモノマーをフラッシュ蒸発させる段階と、
前記多孔性基材の孔壁を被覆するための前記モノマーの被膜を形成するため前記前処理する段階の1秒以内に前記多孔性基材に前記蒸気を凝結させる段階と、
前記多孔性基材の前記孔壁に機能化された高分子層を形成するため前記被膜を硬化させる段階とを含み、
前記凝結させる段階が、前記高分子層を最大で3.0μmの厚さに制限する蒸気密度及び滞在時間の条件下で実行される、
工程によって製造した機能化された多孔性基材。 - 前記工程が無機物層を前記高分子層上に真空蒸着する段階を更に含む、請求項19に記載の機能化された多孔性基材。
- 前記無機物層が、金属及びセラミックからなるグループから選択される、請求項20に記載の機能化された多孔性基材。
- 前記工程がモノマーをフラッシュ蒸発させ、前記無機物層に当該モノマーの第2被膜を凝結させる段階と、前記無機物層に第2高分子層を形成するため、前記第2被膜を硬化させる更なる段階とを含む、請求項20に記載の機能化された多孔性基材。
- 前記工程がモノマーをフラッシュ蒸発させ、前記無機物層に当該モノマーの第2被膜を凝結させる段階と、前記無機物層に第2高分子層を形成するため、前記第2被膜を硬化させる更なる段階とを含む、請求項21に記載の機能化された多孔性基材。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが撥水性及び撥油性機能を提供するフッ化モノマーである、請求項19に記載の機能化された多孔性基材。
- 前記モノマーが着色添加物を含む、請求項24に記載の機能化された多孔性基材。
- 前記モノマーが殺生物添加物を含む、請求項24に記載の機能化された多孔性基材。
- 前記モノマーが難燃性機能を提供する臭素化モノマーを含む、請求項24に記載の機能化された多孔性基材
- 前記多孔性基材が、多孔性材料からなるポリプロピレン、ポリエチレン、ポリエステル、ナイロン、レイヨン、紙、綿、ウール、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが、親水性機能を提供するヒドロキシル、カルボキシル、スルホン酸、アミノ、アミド、又はエーテルからなるグループから選択される官能基で機能化される、請求項19に記載の機能化された多孔性基材。
- 前記モノマーが着色添加物を含む、請求項28に記載の機能化された多孔性基材。
- 前記モノマーが殺生物添加物を含む、請求項28に記載の機能化された多孔性基材。
- 前記モノマーが難燃性機能を提供する臭素化物質を含む、請求項28に記載の機能化された多孔性基材。
- 前記モノマーが、金属キレート化機能を提供するアクリレート化アセチルアセトネート・モノマーを含む、請求項28に記載の機能化された多孔性基材。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、綿、ウール、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーが、プロトン伝導性機能を提供するスルホン酸基である、
請求項19に記載の機能化された多孔性基材。 - 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含み、前記モノマーがスルホン酸基を含み、イオン伝導性機能を備えた高分子電解質を提供するため、前記硬化段階に先だって前記モノマー上に金属リチウムを共蒸着する段階を更に含む、請求項19に記載の機能化された多孔性基材。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含む、請求項21に記載の機能化された多孔性基材。
- 前記多孔性基材が、ポリプロピレン、ポリエチレン、フルオロポリマー、ポリエステル、ナイロン、レイヨン、紙、ウール、綿、グラスファイバ、炭素繊維、セルロースに基づく繊維、及び金属からなるグループから選択される多孔性材料を含む、請求項23に記載の機能化された多孔性基材。
- 前記モノマーが親水性の静電散逸機能を組み込んだ、請求項19に記載の機能化された多孔性基材。
- 前記モノマーがpH感知機能を組み込んだ、請求項19に記載の機能化された多孔性基材。
- 前記モノマーが香気放出機能を組み込んだ、請求項19に記載の機能化された多孔性基材。
- 前記工程が前記基材の反対側に異なる機能をもたらすため使用される、請求項19に記載の機能化された多孔性基材。
- 前記モノマーがアクリレート・モノマーである、請求項1に記載の工程。
- 前記モノマーがアクリレート・モノマーである、請求項19に記載の機能化された多孔性基材。
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CN107365423B (zh) * | 2017-08-07 | 2019-12-24 | 武汉大学 | 一种纤维素的疏水改性方法 |
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CN1791701A (zh) | 2006-06-21 |
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JP2006524759A (ja) | 2006-11-02 |
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