- Lyotropic liquid crystalline polyamides containing aromatic, heterocyclic structures: Preparation and properties
- 点击次数：
- 论文类型： 期刊论文
- 发表时间： 2006-09-04
- 发表刊物： MACROMOLECULAR CHEMISTRY AND PHYSICS
- 收录刊物： SCIE、EI、Scopus
- 卷号： 207
- 期号： 17
- 页面范围： 1610-1615
- ISSN号： 1022-1352
- 关键字： amorphous; lyotropic liquid crystalline; polyamides; solubility
- 摘要： A series of novel lyotropic liquid crystalline polyamides derived from 1,2-dihydro-2-(4-aminophenyl)-4-[4-(4-(aminophenoxyl)phenyl)]-phthalazinone (DHPZ-DA), p-phenylene diamine (PPD) and terephthaloyl dichloride (TPC) have been successfully synthesized by the low temperature solution polycondensation method. The copolymers obtained with inherent viscosity of approximate to 1.21 to 3.29 dl . g(-1), determined in NMP (1 wt.-% LiCl) or concentrated H2SO4 at 25 degrees C, were confirmed to be amorphous by WAXD and differential scanning calorimetry (DSC). Their solubility was improved by the introduction of non-coplanar, twisted phthalazinone moieties and ether linkages into the main chain with the result that they can be soluble in some polar solvents containing a small amount of LiCl. Their T(g)s were all above 310 degrees C and 10% weight loss temperatures in nitrogen above 500 degrees C. Most of these polyamides can form an anisotropic phase in concentrated H2SO4, NMP (1 wt.-% LiCl) and DMAc (1 wt.-% LiCl) solutions, observed on a polarizing light microscope.
