PVDF基双组分纤维的生产及其功能化

Production and functionalizing of bicomponent fibers based on PVDF

探究了由导电聚丙烯(PP)芯层和具有压电效应的聚偏氟乙烯(PVDF)皮层组成的双组分纤维的熔融纺丝过程。以往具有压电效应的PVDF被开发成传感器单丝。由于PP中掺杂了碳纳米管,因而纤维芯材可以导电。皮材的压电效应基于纤维在牵伸卷绕过程中β相所形成的全反式构象。通过广角X射线衍射(WAXD)分析纤维的皮芯结构,发现碳纳米管在聚合物基体中的分散状况会影响芯材的导电性,因此用透射电子显微镜(TEM)观察了碳纳米管在聚合物基体中的分布情况,纤维直径(皮、芯部分)的变化采用光学显微镜观察,并用流变仪测定了材料的黏度,用电感电容电阻测试仪(LCR)检测了芯材的比电阻。

This research explains the meh spinning of bicomponent fibers which consist of a conductive polypropylene （PP） core anti a sheath with piezoelectric characleristics （polyvinylidene fluoride）. Previously analyzed piezoelectric capabilities of polyvinylidene fluoride （PVDF） are to be exploited in sensor filaments. The fiber core is conductive due to a percolation CNT network in polypropylene. The sheath＇s piezoeleeh＇ic effect is based on the formalion of an all-trans confornmtion β phase, caused by draw-winding of the fibers. The core and sheath structure are characterized through wide-angle X-ray diffraction （WAXI））. The distribution of CNTs in the polymer matrix, which affects the conductivity of the core, was investigated bv transmission electron Inicrnscopy （TEM）. Optical microscopy is used to determine the fiber＇s diameter regularity （core and sheaath）. The materials＇s viscosity is determined by rheometry. Eventually, an LCR tester is used to determine the core＇s specific resistance.