摘要
合成了一系列新的含X-型二维液晶基元和反式-4,4′-双(4-羟基苯基偶氮)二苯并-14-冠-4冠醚环的主链型液晶共聚酯.通过GPC,[η],DSC,TG,WAXD和POM对其液晶性研究发现,所有的共聚酯都呈现出向列相的丝状织构或纹影织构。共聚酯的熔融温度(T_m)和各向同性温度(T_i)随共聚酯分子中反式-4,4′-双(4-羟基苯基偶氮)二苯并-14-冠-4用量的改变呈规律性变化。
A novel series of main chain liquid crystalline copolyesters with X-shaped two-dimensional mesogenic units and crown ether cycles of trans-4,4＇-bis（4-hydroxyphenylazo）dibenzo-14-crown-4 were synthesized and their mesomorphic properties were studied through GPC, [η], DSC, TG, WAXD and POM. It was found that all the copolyesters showed the thread texture or schlieren texture. Their melting temperature （Tm） and isotropization temperature （TO were changed regularly with varying the trans-4,4＇-bis- （4-hydroxyphenylazo）dibenzo- 14-crown-4 unit content in the copolyesters.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2007年第8期755-759,共5页
Acta Chimica Sinica
基金
国家自然科学基金(No.29974026)
河南省自然科学基金(No.0211021100)
河南省教育厅自然科学基金(No.20021500004)资助项目。
