Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2007-08-01

Journal: EUROPEAN POLYMER JOURNAL

Included Journals: Scopus、EI、SCIE

Volume: 43

Issue: 8

Page Number: 3683-3687

ISSN: 0014-3057

Key Words: copolymerization; liquid-crystalline polymers (LCP); lyotropic; poly(ether ketones); phthalazinone

Abstract: A novel lyotropic liquid crystalline material poly(aryl ether ketone) copolymer containing phthalazinone moiety and biphenyl mesogen named P-8515 was developed by a mild solution polycondensation method, The molecular weight (M-n) was 53,000 and the value of molecular weight distribution index (MDI) was 2.49 detected by GPC. The critical concentration (C*) of P-8515 was 36 wt% and P-8515 exhibited characteristic nematic lyotropic liquid crystalline phases in NMP solution at different concentrations and the phase morphology changed to a typical threaded texture when shear forces were induced from PLM observations. The T-g value was 238 degrees C and the value for 5% weight loss temperature was 515 degrees C in nitrogen from DSC and TGA determinations, respectively. (c) 2007 Elsevier Ltd. All rights reserved.