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论文类型：期刊论文

发表时间：2008-01-01

发表刊物：POLYMER JOURNAL

收录刊物：SCIE、EI

卷号：40

期号：1

页面范围：46-49

ISSN号：0032-3896

关键字：copolymerization; phthalazinone; thermotropic liquid crystalline polymers (LCPs); poly(aryl ether ketones)

摘要：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.