A novel diamine, 4′-phenylphenyl 4-(3",5"-diaminobenzoyloxy)benzoate and longer side-chain polyimide

被引:0
|
作者
Yang, J [1 ]
Ren, LG [1 ]
Liu, XY [1 ]
Gu, Y [1 ]
机构
[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Peoples R China
关键词
polyimide; film materials; side-chain; synthesis;
D O I
暂无
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This is a part of our systematic research work on polyimides with mesogenic unit side chain. In this study, a new 4'-phenylphenyl 4-(3 '',5 ''-diaminobenzoyloxy)benzoate and polyimide were synthesized, and characterized by FrIR, H-1-NMR, inherent viscosity, mechanical properties, and solubility measurements. The diamine composed with mesogenic unit aryl ester groups and biphenyl group with longer L/D ratio, was synthesized by two key steps. Firstly, the hydroxy group of 4-hydroxybenzoic acid was protected by acetoxy group for avoiding self-polymerization of 4-hydroxybenzoic acid, and then selectively hydrolyzed after esterification of carboxyl. Secondly, a selective catalysis hydrogenation was adopted to prevent the aryl ester from deoxidation. Based on this diamine, a novel polyimide was prepared by polycondensation of 4'-phenylphenyl 4-(3 '', 5 ''-diaminobenzoyloxy)benzoate and 4-aminophenyl ether(ODA) with 4, 4'-oxydiphthalic anhydride(ODPA) in N-methyl-2-pyrrolidone (NMP). The resulting polyimide with longer side chain showed better solubility and more regular structure. Its inherent viscosity is lower than that without side chains, but its modulus and strength not only maintained, even improved.
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页码:1151 / 1154
页数:4
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