Soluble polyimides from unsymmetrical diamine containing benzimidazole ring and trifluoromethyl pendent group

被引：104
作者：
Choi, Hyungsam [1 ]
Chung, Im Sik [2 ]
Hong, Kipyo [3 ]
Park, Chan Eon [3 ]
Kim, Sang Youl [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea
[2] Korea Res Inst Biosci & Biotechnol, Bionanotechnol Res Ctr, Taejon 305333, South Korea
[3] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 790784, South Korea
来源：
POLYMER | 2008年 / 49卷 / 11期
关键词：
soluble polyimides; benzimidazole ring; trifluoromethyl pendent group;
D O I：
10.1016/j.polymer.2008.04.019
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
New unsymmetrical diamine monomer containing both the benzimidazole ring and trifluoromethyl group, 6,4'-diamino-2'-trifluoromethyl-2-phenylbenzimidazole, was prepared from 2-bromo-5-nitro-benzotrifluoride and 4-nitro-1,2-phenylenediamine. The monomer was polymerized with ODPA, BTDA, and 6FDA by using one-pot synthetic method to obtain corresponding polyimides. All the prepared polyimides were soluble in aprotic polar solvents. Incorporation of trifluoromethyl groups unsymmetrically in the rigid polyimides improves their solubility without decreasing their physical properties. The polymers showed high glass transition temperature (T-g=289-352 degrees C), high thermal stability (Td(10) > 500 degrees C), and relatively low coefficient of thermal expansion (CTE = 26.1-46.4 ppm/degrees C) because of their rigid-rod like structure. Also, they showed low refractive indexes (n = 1.46-1.68) and low birefringence (Delta approximate to 0.02) due to the trifluoromethyl pendent groups that interrupt chain packing and increase free volume. (c) 2008 Elsevier Ltd. All rights reserved.
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页码：2644 / 2649
页数：6
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