CN112225839B - 一种超高分子量聚甲基丙烯酸甲酯的合成方法 - Google Patents
一种超高分子量聚甲基丙烯酸甲酯的合成方法 Download PDFInfo
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Abstract
一种超高分子量聚甲基丙烯酸甲酯(PMMA)的合成方法:将28320~188800重量份甲基丙烯酸甲酯、1~53重量份羰基金属催化剂、20~277重量份有机溴化物引发剂混合均匀,在惰性气体保护、75~85℃的条件下反应10~48h,之后经后处理,即得所述超高分子量PMMA;该聚合反应具有工艺简单、产品纯度高、产物无色透明等优点,且聚合得到的PMMA分子量大于1.0×106道尔顿。
Description
技术领域
本发明属于聚甲基丙烯酸甲酯(PMMA)聚合物材料的制备领域,涉及一种在羰基金属催化作用下、有机溴化物引发甲基丙烯酸甲酯(MMA)单体本体聚合反应制备超高分子量PMMA的新方法。
背景技术
聚甲基丙烯酸甲酯(PMMA)是由甲基丙烯酸甲酯单体(MMA)通过加成聚合反应而得,俗称有机玻璃,是一种重要的热塑性有机聚合物,具有质轻性韧,透光率高和加工性能良好等特点。普通的PMMA耐热性、耐磨性和耐有机溶剂性较差,使用温度不高,表面易擦毛,抗冲击性能不强,抗蠕变性不好,长时间大负荷作用下可导致应力开裂现象,从而限制了它的应用范围。
PMMA的耐热性、耐磨性以及耐室温蠕变等特性都随着PMMA的分子量增加而增强,超高分子量的PMMA(分子量大于100万)在200℃的高温下也能保持一定的力学强度。超高分子量的PMMA还具有很强的韧性、耐磨性和抗冲击性,以及良好的电绝缘性、优异的抗电弧性、耐候性等,从而使超高分子量PMMA在航空、航天、军事、医药、卫生、汽车、建筑等众多领域具有十分广阔的应用前景。
目前,超高分子量PMMA的合成方法主要有自由基乳液聚合、自由基悬浮聚合以及低温等离子体聚合。悬浮聚合和乳液聚合法在生产过程中会产生大量含悬浮剂和乳化剂的废水,从而带来环保问题,后处理成本高,聚合物产品因含悬浮剂、乳化剂而透明性差、纯度低。低温等离子体聚合存在反应机理不详,生产需要高功率射频设备,难以产业化,且反应耗时长、生产效率低、聚合产物结构复杂等问题。
发明内容
本发明提供了一种由羰基金属催化、有机溴化物引发甲基丙烯酸甲酯(MMA)本体聚合反应制备超高分子量聚甲基丙烯酸甲酯(PMMA)的新方法。
本发明的技术方案如下:
一种超高分子量PMMA的合成方法,所述合成方法为:
将28320~188800重量份甲基丙烯酸甲酯、1~53重量份羰基金属催化剂、20~277重量份有机溴化物引发剂混合均匀,在惰性气体保护、75~85℃的条件下反应10~48h(优选24h),之后经后处理,即得所述超高分子量PMMA;
所述羰基金属催化剂为六羰基钼或六羰基铬;
所述有机溴化物引发剂为2-溴异丁酸乙酯、α-溴苯乙酸或2-溴丙酸乙酯;
所述惰性气体为氮气、氩气、氦气、氖气中的一种或多种;
所述后处理可采用本领域公知的常规手段,例如:反应结束后,将反应物取出在60℃进行真空干燥,即得最终产品;
按照本发明方法制备的聚合产物PMMA,其分子量介于1.0×106~6.8×106道尔顿,优选分子量为3.0×106~5.0×106道尔顿。
本发明的有益效果在于:提供了一种使用微量羰基金属做催化剂、有机溴化物引发MMA本体聚合反应制备超高分子量PMMA的新方法。该聚合反应具有工艺简单、产品纯度高、产物无色透明等优点,且聚合得到的PMMA具有超高的分子量(分子量大于1.0×106道尔顿)。
具体实施方式
下面通过具体实施例对本发明作进一步的描述,但本发明的保护范围并不仅限于此。
在具体实施过程中所用原料、仪器设备以及测试表征方法如下。
试剂材料:甲基丙烯酸甲酯(99%,Aladdin),六羰基钼(98%,Macklin),六羰基铬(99%,Aladdin),2-溴异丁酸乙酯(98%,Sigma-Aldrich),α-溴苯乙酸97%,Aladdin)、2-溴丙酸乙酯(98%,Aladdin)。
聚甲基丙烯酸甲酯的分子量测试方法:使用马尔文Viscotek 270Max凝胶渗透色谱仪(GPC)***测定PMMA的数均分子量(Mn)、重均分子量(Mw)以及分子量分布多分散系数PDI(PDI=Mw/Mn)。该***配置有Viscotek VE1122溶剂传输单元,Viscotek VE 3580折光指数检测器,Viscotek 270激光光散射-差式粘度计双检测器,Viscotek VE2585柱温箱以及Viscotek T6000M GPC色谱柱。测试条件:流动相,四氢呋喃;柱温,35℃;流动相流速:1.0mL/min。
聚甲基丙烯酸甲酯的转化率测试方法:聚甲基丙烯酸甲酯的反应转化率采用Bruker Avance III500MHz核磁共振波谱仪进行测定。测试条件:氘代试剂CDCl3;内标:四甲基硅烷(TMS);测试温度:室温。
实施例1
聚合反应的原料组成配方如下:甲基丙烯酸甲酯:2.832g;六羰基铬:5.0mg;2-溴异丁酸乙酯:13.5mg。
按照上述配方,将甲基丙烯酸甲酯、六羰基铬、2-溴异丁酸乙酯混合均匀,在惰性气体保护、80℃的条件下反应23h,反应结束后将反应物取出在60℃下进行真空干燥即得所述超高分子量聚甲基丙烯酸甲酯。
测试表征结果显示:聚合反应转化率78.0%。PMMA聚合物的数均分子量为141万,重均分子量为551万,PDI=3.91。
实施例2
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:2.832g;六羰基钼:1.0mg;2-溴丙酸乙酯:12.2mg;反应温度:80℃;反应时间:21小时。
测试表征结果显示:聚合反应转化率54.1%。PMMA聚合物的数均分子量为134万,重均分子量为322万,PDI=2.40。
实施例3
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:18.880g;六羰基钼:3.0mg;2-溴异丁酸乙酯:2.7mg;反应温度:80℃;反应时间:24小时。
测试表征结果显示:聚合反应转化率70.3%。PMMA聚合物的数均分子量为388万,重均分子量为1407万,PDI=3.63。
实施例4
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:18.880g;六羰基钼:0.3mg;2-溴异丁酸乙酯:6.8mg;反应温度:80℃;反应时间:48小时。
测试表征结果显示:聚合反应转化率47.2%。PMMA聚合物的数均分子量为675万,重均分子量为2316万,PDI=3.43。
实施例5
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:9.440g;六羰基钼:5.3mg;2-溴异丁酸乙酯:27.7mg;反应温度:80℃;反应时间:10小时。
测试表征结果显示:聚合反应转化率57.0%。PMMA聚合物的数均分子量为264万,重均分子量为832万,PDI=3.15。
实施例6
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:9.440g;六羰基钼:0.5mg;α-溴苯乙酸:3.0mg;反应温度:80℃;反应时间:24小时。
测试表征结果显示:聚合反应转化率95.8%。PMMA聚合物的数均分子量为102万,重均分子量为430万,PDI=4.22。
实施例7
合成方法同实施例1。聚合反应的原料组成配方如下:甲基丙烯酸甲酯:9.440g;六羰基钼:0.3mg;α-溴苯乙酸:2.0mg;反应温度:80℃;反应时间:24小时。
测试表征结果显示:聚合反应转化率56.3%。PMMA聚合物的数均分子量为269万,重均分子量为1188万,PDI=4.42。
对比例
张开闩等(化工新型材料,2007,35(12):42-43)以聚乙烯吡咯烷酮以及聚乙烯醇作为悬浮聚合分散剂,MgCO3粉末作为悬浮聚合保护剂,采用过氧化物作为引发剂,在65-70℃反应温度下通过悬浮聚合反应(甲基丙烯酸甲酯:水=1:5质量比)制备了粘均分子量20-150万的聚甲基丙烯酸甲酯,单体转化率约80%。该聚合反应体系中甲基丙烯酸甲酯只占16.6%,生产效率低下,并且所得甲基丙烯酸甲酯聚合物最高分子量仅为150万,且聚合物含有分散剂、保护剂等杂质。
Claims (2)
1.一种超高分子量聚甲基丙烯酸甲酯的合成方法,其特征在于,所述合成方法为:
将28320~188800重量份甲基丙烯酸甲酯、1~53重量份羰基金属催化剂、20~277重量份有机溴化物引发剂混合均匀,在惰性气体保护、75~85℃的条件下反应10~48h,之后经后处理,即得所述超高分子量聚甲基丙烯酸甲酯;
所述羰基金属催化剂为六羰基钼或六羰基铬;
所述有机溴化物引发剂为2-溴异丁酸乙酯、α-溴苯乙酸或2-溴丙酸乙酯;
所述超高分子量聚甲基丙烯酸甲酯的分子量介于1.0×106~6.8×106道尔顿。
2.如权利要求1所述超高分子量聚甲基丙烯酸甲酯的合成方法,其特征在于,反应时间为24h。
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