热致液晶聚酯/聚醚醚酮复合纤维的制备与表征  

Preparation and Characterization of Thermotropic Liquid Crystalline Polyarylate/Poly(ether ether ketone)s Composite Fibers

作　　者：陈鹏[1] 曾栌贤 牟浩[1] 徐建军[1] 叶光斗[1] 刘鹏清[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2017年第6期157-162,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金青年基金资助项目(51403133)

摘　　要：将热致液晶聚酯(VA)与聚醚醚酮(PEEK)共混后,通过熔融纺丝制备了热致液晶聚酯/聚醚醚酮复合纤维,并对复合纤维的热性能、聚集态结构、相态结构和力学性能进行了研究。结果表明,VA的加入能够降低PEEK纤维的玻璃化温度和冷结晶温度,同时PEEK的结晶温度也随着VA的加入而升高;VA的加入有利于提高PEEK的结晶性能,使得PEEK晶粒尺寸变大,晶面间距变小,晶体更加完善,晶区取向增强;随着VA添加量的增大,VA相逐渐由球状或椭球状向微纤状变化;随着喷丝头拉伸比的增大,VA相的长径比呈现先增大后减小的趋势;添加1%和2%的VA后,复合纤维的断裂强度有少许下降,而当VA的添加量增大到4%后,复合纤维的总拉伸倍数提高,并且断裂强度有一定的提升。Thermotropic liquid crystalline polyarylate / poly（ether ether ketone）s composite fibers was prepared by blending Vectra A950（VA） and poly（ether ether ketone）（PEEK） via melt spinning. The thermal property, aggregation structure, phase structure and mechanical property were studied. The results show that the glass transition temperature and cold crystallization temperature of PEEK fiber decrease and crystallization temperature of PEEK fiber increases after adding VA; The grain size of PEEK increases and the crystal plane spacing decreases with the addition of VA, and the orientation of PEEK crystal is enhanced by VA; The VA phase gradually changes from spherical or ellipsoidal to microfibril with increasing the content of VA; the aspect ratio of VA phase firstly increases and then decreases with increasing jet stretch ratio; after adding 1% and 2% VA, the fracture strength of the composite fiber decreases slightly; after the content of VA increases to 4%, the total tensile ratio of the composite fiber and the fracture strength increase.

关 键 词：聚醚醚酮纤维 热致液晶 共混纺丝 复合纤维 相形态 

分 类 号：TQ342.94[化学工程—化纤工业]