Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2008-01-01

Journal: POLYMER JOURNAL

Included Journals: EI、SCIE

Volume: 40

Issue: 1

Page Number: 46-49

ISSN: 0032-3896

Key Words: copolymerization; phthalazinone; thermotropic liquid crystalline polymers (LCPs); poly(aryl ether ketones)

Abstract: A novel thermotropic liquid crystalline poly(aryl ether ketones) copolymer containing phthalazinone, moiety and biphenyl mesogen named P-5050 was developed by a mild solution polycondensation reaction. The thermotropic liquid crystalline properties were characterized by the means of differential scanning calorimetry (DSC), polarized light microscopy (PLM) and wide-angel X-ray diffraction (WAX-D). A thread-like texture was achieved when P-5050 was annealed at 320 degrees C for I h, and a typical schlieren texture was observed when shear forces were induced at that temperature. The crystalline-to-liquid crystalline transition (T-m) and the liquid crystalline-to-isotropic phase transition (T-i) appeared in both the first cooling and second heating DSC thermograms. The glass transition temperature (T-g) was 160 degrees C and the value for 5% weight loss temperature was 510 degrees C in nitrogen from DSC and TGA determinations, respectively.