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武汉理工大学 材料科学与工程学院,湖北 武汉,430070
收稿日期:2009-10-25,
修回日期:1900-01-02,
网络出版日期:2010-06-30,
纸质出版日期:2010-06-30
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张传吉;黄志雄;石敏先. 全芳热致性液晶高分子/玻纤原位复合材料的合成与表征[J]. 液晶与显示, 2010,25(3): 311-315
ZHANG Chuan-ji;HUANG Zhi-xiong;SHI Min-xian. Synthesis and Characterization of All-Aromatic Thermotropic Liquid Crystalline Polymer/Glass Fiber In-Situ Composites[J]. 液晶与显示, 2010,25(3): 311-315
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(
1
H NMR)、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.Thats because glass fiber formed oriented structures and TLCP also show a self-fibrosis phenomenon.
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