聚脲酰亚胺共聚物的合成及表征  

Studies on Synthesis and Characterization of Polyureas-imide

作　　者：方昉[1] 杨晓慧[1] 姚洪喜[1] 王铭钧[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《化学世界》2006年第1期24-28,共5页Chemical World

摘　　要：为了改善聚酰亚胺对介质的粘附性和提高对液晶分子的定向功能，报道了用甲苯二异氰酸酯（TDI）作为扩链剂对含-NH2-端基的聚酰胺酸预聚体进行扩链改性，合成了新型结构的聚脲酰亚胺聚合物。通过红外分析和TGA对此聚合物的热稳定性进行了研究，以DSC和TMA对此聚合物的相分离进行了讨论。以DEA方法，在0．1—10^5Hz宽频范围和0—350℃区间完整地测定了聚脲酰亚胺的介电常数ε′-温度的频率谱和介电损耗tanδ-温度的频率谱，符合液晶分子定向膜材料的电性能要求。从测定的此聚合物对液晶分子定向性能参数可知，聚脲酰亚胺是一类可供TN—LCD、HTN—LCD等显示器生产的良好的定向膜材料。A novel type of polyureas-imide was prepared by a reaction of amino-terminated prepely （amic acid） and TDI, which was used as a chain extender to improve the adhesion to medium and the alignment ability for liquid crystal of polyureas-imide. The thermal stability was studied via IR and TGA. The results of DSC and TMA showed that polyureasimide exhibited a well phase-separated morphology. By dielectric analysis method, the charts of ε′ - T and tanδ - T were respectively determined on brand-frequency from 0.1 Hz to 105 Hz and temperature from 0℃ to 350℃, which showed that the polyureas-imide met the demand of alignment film material. From the values of the alignment ability of this material for liquid crystal, it could be concluded that polyureas-imide was a sort of good alignment film material for TN-LCD or HTN-LCD etc.

关 键 词：聚脲酰亚胺 合成方法 相分离 介电特性 液晶显示器定向膜 

分 类 号：TN204[电子电信—物理电子学]