- Synthesis and properties of lyotropic liquid crystalline copolyamides containing phthalazinone moiety and ether linkages
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- 论文类型： 期刊论文
- 发表时间： 2005-07-25
- 发表刊物： POLYMER
- 收录刊物： SCIE、EI、Scopus
- 卷号： 46
- 期号： 16
- 页面范围： 6258-6265
- ISSN号： 0032-3861
- 关键字： copolyamides; phthalazinone; lyotropic liquid crystalline
- 摘要： A series of aromatic copolyamides containing phthalazinone moiety and ether linkages were prepared from 1,2-dihydro-2-(4-aminophenyl)-4-[4-(4-(aminophenoxyl)phenyl)](2H)phthalazin-1-one (DHPZ-DA), p-phenylenediamine (PPD), 4,4'-diaminodiphenylether (DAPE) and terephthaloyl dichloride (TPC) by low temperature solution polycondensation. The copolyamides had relatively high inherent viscosities, ranging from 1.86 to 5.30 dl/g. The copolyamides showed T, values between 297 and 351 C. Solubility of these copolyamides was improved in NMP, DMAc, NMP (1 wt% LiCl) and DMAc (1 wt% LiCl) by introducing phthalazinone moiety and ether linkages into the main chain. And they had good thermal stability, associated with 5 and 10% weight loss temperatures in the range of 480-516 and 501532 C in nitrogen, respectively. WARD measures indicated these copolyamides were semicrystalline in nature. Some of these copolyamides exhibited lyotropic liquid crystalline behavior in concentrated H2SO4, NMP (1 wt% LiCl), and even in NMP solutions, as evidenced by polarizing light microscopy. (c) 2005 Elsevier Ltd. All rights reserved.
