侧链型芳香族偶氮基聚氨酯的合成及其液晶态的研究  

Synthesis and LC properties of a kind of side chain PU with aromatic azo - group

作　　者：章于川[1] 范程士[1] 杭德余[1] 黎群[1] 沈效峰[1] 姚海波[1] 

机构地区：[1]安徽大学化学化工学院,安徽合肥230039

出　　处：《安徽大学学报（自然科学版）》2003年第4期73-77,82,共6页Journal of Anhui University(Natural Science Edition)

基　　金：安徽省科技厅"十.五"攻关基金资助项目(200183)

摘　　要：采取两步法合成侧链型芳香族偶氮基聚氨酯,并应用FT-IR、VPO、DSC和TPOM表征聚氨酯的结构及液晶性。MDI系列聚氨酯由于其主链刚性较大,不出现液晶相,而HDI系列聚氨酯则可出现液晶相,并随着由扩链剂引入主链的“柔性间隔基”的柔性和长度增加,“去偶”作用增强,其液晶相的转变温度和有序性也随之提高。A series of side chain polyurethane (PU) with aromatic azo- group were synthesized by two step polymerization and the chemical structure and LC properties of PU were characterized by means of FT - IR, VPO, DSC and TPOM . Because of the hindrance of hard segment in the backbone, the LC phase of MDI - type PU could not be found, but HDI - type PU could form LC phase by decoupling of flexible spacer in its backbone. And as the flexibility and length of flexible spacer increased by different chain extender, the transition temperature and ordered degree of LC phase of HDI - type PU also rise.

关 键 词：侧链型芳香族偶氮基聚氨酯 合成 芳香族偶氮介晶基元 热致性液晶 去偶作用 液晶相转变温度 织构 合成 功能材料 

分 类 号：O635.2[理学—高分子化学] TB34[理学—化学]