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首页> 外文期刊>Journal of Applied Polymer Science >Toughening and Phase Separation Behavior of Nylon 6-PEG Block Copolymers and In Situ Nylon 6-PEG Blend Via In Situ Anionic Polymerization
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Toughening and Phase Separation Behavior of Nylon 6-PEG Block Copolymers and In Situ Nylon 6-PEG Blend Via In Situ Anionic Polymerization

机译：尼龙6-PEG嵌段共聚物与原位尼龙6-PEG共混物通过原位阴离子聚合的增韧和相分离行为

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摘要

We have prepared in situ molded products of morphologically different nylon 6/polyethylene glycol (PEG) copolymers and their blends via anionic polymerization of #epsilon#-caprolactam in the presence of serveral kinds of PEG derivatives using sodium caprolactamate as a catalyst and carbamoyl caprolactam derivative as an initiator. Three carbamoyl caprolactams, such as tolylene dicarbamoyl dicaprolactam (TDC), hexamethylene dicarbamoyl dicaprolactam (HDC), and cyclohexyl carbamoyl caprolactam (CCC), with different functionalities and activities were used. Phase separation behavior was investigated by dynamic mechanical thermal analysis (DMTA) and DSC during in situ polymerization and melt crystallization. The mechanical properties of these molded rpoducts were evaluated. PEG segments in the block copolymers showed amorphous characteristics, whereas a large fraction of unreacted PEG segments was rystallized in as-polymerized samples, except for the products obtained using the CCC activator. The presence of PEG derivatives retarded the crystallization of nylon 6 part during in situ polymerization as melt crystallization. However, PEG segments did not alter the crystalline structure of onlyon 6, showing #alpha#-crystalline modification. The nylon 6-PEG-nylon 6 triblock copolymers showed the highest impact strength, whereas the nylon 6-PEG diblock copolymers and in situ nylon 6-PEG blends showed no improved toughness.
机译：我们通过使用己内酰胺酸钠作为催化剂和氨基甲酰基己内酰胺衍生物，在多种类型的PEG衍生物存在下，通过＃epsilon＃-己内酰胺的阴离子聚合，制备了形态不同的尼龙6 /聚乙二醇（PEG）共聚物及其共混物的原位模塑产品作为发起者。使用了三种具有不同功能和活性的氨基甲酰基己内酰胺，例如甲苯二氨基甲酰基双己内酰胺（TDC），六亚甲基二氨基甲酰基双己内酰胺（HDC）和环己基氨基甲酰基己内酰胺（CCC）。通过动态机械热分析（DMTA）和DSC在原位聚合和熔融结晶过程中研究了相分离行为。评价了这些模压产品的机械性能。嵌段共聚物中的PEG链段显示出无定形特征，而大部分未反应的PEG链段在聚合后的样品中被重结晶，除了使用CCC活化剂获得的产物。 PEG衍生物的存在阻碍了原位聚合过程中尼龙6部分的结晶，即熔融结晶。但是，PEG片段没有改变6号晶体的晶体结构，显示出＃alpha＃晶体修饰。尼龙6-PEG-尼龙6三嵌段共聚物显示出最高的冲击强度，而尼龙6-PEG二嵌段共聚物和原位尼龙6-PEG共混物则没有改善的韧性。

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