以N,N′-二（ω-羟乙基）苯均四甲酰二亚胺（BHDI）、对苯二甲酰氯（TPC）、4,4′-二（β-羟己氧基）联苯（BP6）为单体,通过改变BHDI和BP6的物质的量比,制备了三种主链上同时含有联苯基和亚胺基的聚酯液晶（PBHT）。采用傅里叶红外光谱（FT-IR）、差示扫描量热分析仪（DSC）、偏光显微镜（POM）、广角X射线衍射（WAXD）及热重分析（TGA）等手段对聚合物结构及性能进行表征。结果表明,当BP6和BHDI物质的量比为4∶3时,聚酯液晶（PBHT）的液晶区间最宽,为116℃-190℃;该类液晶在液晶态温度区间呈现出向列型液晶丝状织构,WAXD分析显示为半结晶性聚合物;随着BHDI含量的增大,液晶聚酯热性能有所提高。
Three kinds of liquid crystalline polyester （PBHT） containing biphenylnate and imide units were synthesized by polyaddition reaction of 4,4＇-bis- （6-hydroxyhexoxy） biphenyl （BP6） with terephthaloy chloride（TPC） and N, N＇-bis （2-hydroxyhexyl） dicarboxyimide （BHDI） through changing the molar ratio of BP6 and BHDI. PBHTs were characteristied by using infrared spectroscopy （FT-IR）, differential scanning calorimetry （D S C）, polarized light microscopy （POM）, X-ray diffraction （WAXD） and thermogravimetric analyse（TGA）. The results show that the type of PBHT has the most extensive liquid crystalline range for 116 ＊C -190 ＊（2, when molar ratio of BP6 and BHDI is 4 ： 3. All of the liquid crystalline polyester exhibit thermotropic nematic liquid crystalline textures at the liquid crystalline temperature range. WAXD analysis shows that PBHTs is the semi-crystalline polymers. The TGA observation confirms that the thermal performance of PBHT can be improved much by adding imide units.
参考文献
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