液晶增强聚对苯二甲酸乙二醇酯复合材料的进展  

Progress of Liquid-Crystalline Polymer Reinforced Poly(Ethylene Terephthalate) Composite

作　　者：杨叶华[1,2,3] 袁俊杰 胡涛 罗锋[3] 龚兴厚 吴崇刚 YANG Yehua;YUAN Junjie;HU Tao;LUO Feng;GONG Xinghou;WU Chonggang(Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology,Wuhan, Hubei 430068,China;Collaborative Innovation Center of Green Light-Weight Materials and Processing, Hubei University of Technology, Wuhan, Hubei 430068. China;School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,湖北武汉430068 [2]绿色轻质材料与加工湖北工业大学协同创新中心,湖北武汉430068 [3]湖北工业大学材料与化学工程学院,湖北武汉430068

出　　处：《塑料》2017年第6期67-79,共13页Plastics

基　　金：湖北省自然科学基金(2014CFA094);人社部留学人员科技活动项目择优资助基金(人社厅函[2013]277号);湖北工业大学海外高层次人才科研启动基金(湖工大科[2005]2号)

摘　　要：系统介绍了液晶(聚合物)(LCP)的种类与含量对LCP增强聚对苯二甲酸乙二醇酯(PET)复合材料相容性、结晶性、流变及力学性能的影响。当LCP为刚性4-羟基苯甲酸-2-羟基萘-6-甲酸共聚物(HBA-HNA)(Vectra)时,由于热塑性PET与向列型HBA-HNA不发生熔融酯交换反应,复合材料的相容性差、力学性能弱。而当LCP为商业化、半柔性4-羟基苯甲酸-对苯二甲酸-乙二醇共聚物(PHB-PET)时,因PET与PHB-PET中的PET柔性链段之间发生了酯交换反应,两组分间的相容性增加,但PET基体相与PHB-PET分散相均因分子链规整性的降低而分别导致结晶性与液晶性减弱,因此复合材料的力学性能通常在酯交换反应程度时最佳。以癸二酸-4,4'-二羟基联苯-4-羟基苯甲酸共聚物(SBH)为代表的LCP与PET进行熔融共混;无论LCP中是否存在柔性链段(如:SBH),其对PET基体的影响都与PHB-PET或HBA-HNA基本类似。虽然可以向不相容PET/LCP复合物中填充无机填料以实现增强,但更多的是引入少量第三组分增容剂对PET/LCP进行增容,从而有效提高复合材料的力学性能。此外,探讨了拉伸比、剪切速率、加工温度、超声处理、模具温度与保温时间、共挤出等工艺条件对PET/LCP复合材料流变与力学性能的影响。当在PET熔体中引入少量离子基团时,PET的离子与LCP的酯基之间的离子-偶极相互作用改善了相容性,同时,离子静电自组装所形成离子簇的诱导成核增加了PET相的结晶度,两者协同提高了PET/LCP复合材料的力学性能;而且,该熔融离子化改性技术有望成为LCP增强PET复合材料的未来发展方向之一。Effects of the type and concentration of liquid-crystalline polymers （LCP） have been reviewed on the eompatibility,crystallinity,rheological and mechanical properties of the LCP reinforced poly （ethylene terephthalate） （PET） composite systematically. When the LCP is a rigid poly （4-hydroxybenzoie acid-ran-2-hydroxynaphthalene-6-carboxylic acid） （HBA-HNA） （Vectra）, the composite exhibit weak mechanical properties from their poor compatibility due to the failure of the thermoplastic PET to undergo melt transesterification with the nematie HBA-HNA. However,when the LCP is a commereialized,semiflexible copolymer of 4-hydroxybenzoic acid, terephthalie acid, and ethylene glycol （PHB-PET） , the compatibility of the composite is improved due to an occurrence of transesterification between the PET and the PET flexible chain segments of the PHB-PET,while concurrently the erystallinity of the PET matrix phase and the liquid crystallinity of the PHB-PET dispersed phase both are reduced as a consequence of their decreased chain tacticity from the transesterification, giving rise to maxima in the mechanical properties of the composite usually at an optimum degree of transesterification. Laboratory-synthesized LCP, such as a copolymer of sebacic acid ,4,4＇-dihydroxybiphenyl, and 4-hydroxybenzoie acid （SBH） as a representative, also are melt-compounded with PET; when the LCP contain （as SBH does） and do not contain flexible moieties （ i. e. , chain segments） ,respectively,their effects on the PET matrix essentially are similar to those of PHB-PET and HBA-HNA. Although inorganic fillers are filled into incompatible PET/LCP composite to mechanically strengthen them,a small amount of third-component compatibilizer has more predominantly been introduced to compatibilize the PET/LCP, thereby effectively improve their mechanical properties. In addition, influences have been discussed of the process conditions such as extension ratio, shear rate,processing temperature, ultrasonic treatment, mol

关 键 词：聚对苯二甲酸乙二醇酯 液晶聚合物 复合材料 相容性 增强 

分 类 号：TB332[一般工业技术—材料科学与工程]