PVDF/PA11交替多层原位微纤高介电复合材料的形态及性能  

Study on Morphology and Properties of PVDF/PA11 Alternating Multilayer In-situ Microfiber High Dielectric Composites

作　　者：朱永军 李陵洲 王廷 康冬雪 刘诗 雷勇 韦良强 ZHU Yong-jun;LI Ling-zhou;WANG Ting;KANG Dong-xue;LIU Shi;LEI Yong;WEI Liang-qiang(Hubei Heju Polymer Materials Co.,Ltd.,Jinzhou 434100,China;Guizhou University,National Engineering Research Center for Compouding and Modification of Polymer Materials,Guiyang 550025,China)

机构地区：[1]湖北合聚高分子材料有限公司,湖北荆州434100 [2]贵州大学国家复合改性聚合物材料工程技术研究中心,贵州贵阳550025

出　　处：《塑料工业》2021年第12期46-50,112,共6页China Plastics Industry

基　　金：湖北省揭榜制科技项目鄂科技发资[2020]24号(2020BED009新能源用汽车电器盒用新型高分子材料的研发)。

摘　　要：采用微纳层叠多层共挤技术,制备了聚偏氟乙烯(PVDF)/聚酰胺11(PA11)交替多层原位微纤复合材料,研究了PA11微纤对复合材料的结构与性能的影响。结果表明,随着PA11含量的增加,微纤含量增大,微纤直径变小,直径在2~4μm之间,微纤彼此缠结的倾向增大,尺寸倾向均一;PA11微纤是PVDF异相成核剂,可提高复合材料的结晶度;微纤含量低于5%时,PVDF相有双熔融峰现象,微纤含量不低于5%时,PVDF相的双熔融峰现象消失。PA11微纤可以提高复合材料的介电常数,且PA11含量为7.5%时,复合材料的介电常数最大,达到59.46,提高了77.17%;复合材料介电损耗略有提高;PA11微纤可以提高复合材料的拉伸强度和断裂伸长率,但是对弹性模量的提高意义不大。Micro-nano multilayer coextrusion technology was used to prepare poly(vinylidene fluoride)/polyamide11(PVDF/PA11)alternating multilayer in-situ microfiber high dieclectric composites.The effect of PA11 micro-fiber on structures and properties of PVDF/PA11 composites was researched.The results show that with the increasing contents of PA11,the contents of micro-fiber increase.The diameter of micro-fiber becomes slightly smaller and diameter is about 2~4 μm.The tendency of micro-fiber to entangle each other increases and the size uniformity increases.PA11 micro-fiber is heterogeneous nucleation agent of PVDF phase, and could improve the degree of crystallinity.When micro-fiber content is less than 5%,there are double endothermic peaks of PVDF.When micro-fiber content is not less than 5%,the double melting peaks could disappear.PA11 Micro-fiber increases dielectric constant of composites.When the content of PA11 is 7.5%,dielectric constant could reach a maximum of 59.46,which increases 77.17%.The dielectric loss of composites increases, but not large enough.PA11 microfiber can improve the tensile strength and elongation at break of the composites, but has little effect on the elastic modulus.

关 键 词：聚偏氟乙烯 聚酰胺11 原位微纤 结构 性能 微纳多层共挤 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TQ322.3