Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2006-09-04

Journal: MACROMOLECULAR CHEMISTRY AND PHYSICS

Included Journals: Scopus、EI、SCIE

Volume: 207

Issue: 17

Page Number: 1610-1615

ISSN: 1022-1352

Key Words: amorphous; lyotropic liquid crystalline; polyamides; solubility

Abstract: 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.