全芳热致性液晶高分子/玻纤原位复合材料的合成与表征  

Synthesis and Characterization of All-Aromatic Thermotropic Liquid Crystalline Polymer/Glass Fiber In-Situ Composites

作　　者：张传吉[1] 黄志雄[1] 石敏先[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《液晶与显示》2010年第3期311-315,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金项目(No.50772083)

摘　　要：以对羟基苯甲酸(HBA)、4,4′-联苯二酚(HB)、1,3-二溴丙烷(DP)、对苯二甲酸(TA)为共聚物单体,玻纤为增强共聚组分,采用原位熔融缩聚的方法,一步混合直接投料聚合出全芳香族液晶共聚酯/玻纤原位复合材料。用核磁共振(1HNMR)、差热分析(DSC)、偏光显微镜(POM)、扫描电镜(SEM)等测试分析手段对复合材料的结构、热性能和液晶特性进行了表征。研究结果表明,合成所得的复合材料呈现明显的向列性热致液晶的特性,取代基的引入降低了复合材料的熔点,而取代基链长直接影响复合材料的熔点。玻纤的加入增强了复合材料的强度,在TLCP的基体中,玻纤拥有良好的取向性,同时TLCP也有自纤化现象的产生。Melt poly-condensation reaction has been applied for the synthesis of a new all-aromaitc thermotropic liquid crystalline polymer derived from 4-acetoxybenzoic,4,4＇-diacetoxybiphenyl,1,3-dibromobutane and terephthalic acid.All the obtained composites were chara-cterized by conventional spectroscopic methods.Their liquid crystalline behaviors and thermal properties of the all-aromatic polyesters were characterized with polarized optical microscopy（POM）,thermogravimetric analysis,and differential scanning calorimetry（DSC）.An obvious birefringence phenomenon with nematic texture was found.The wholly rigidity backbone aromatic series ester has a high glass transition,when substituent is leaded-in,the glass transition will reduce obviously.The mechanical properties of TLCP/GF had been improved greatly as the content of glass fiber was increased.That＇s because glass fiber formed oriented structures and TLCP also show a self-fibrosis phenomenon.

关 键 词：全芳香共聚酯 热致性液晶 原位复合 玻纤 增强 

分 类 号：O753.2[理学—晶体学]