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    张丽, 徐衡, 郎美东. 高分子量PCT聚酯的合成及性能表征[J]. 功能高分子学报, 2017, 30(4): 437-443. doi: 10.14133/j.cnki.1008-9357.2017.04.004
    引用本文: 张丽, 徐衡, 郎美东. 高分子量PCT聚酯的合成及性能表征[J]. 功能高分子学报, 2017, 30(4): 437-443. doi: 10.14133/j.cnki.1008-9357.2017.04.004
    ZHANG Li, XU Heng, LANG Mei-dong. Synthesis and Characterization of High Molecular Weight PCT Polyester[J]. Journal of Functional Polymers, 2017, 30(4): 437-443. doi: 10.14133/j.cnki.1008-9357.2017.04.004
    Citation: ZHANG Li, XU Heng, LANG Mei-dong. Synthesis and Characterization of High Molecular Weight PCT Polyester[J]. Journal of Functional Polymers, 2017, 30(4): 437-443. doi: 10.14133/j.cnki.1008-9357.2017.04.004

    高分子量PCT聚酯的合成及性能表征

    Synthesis and Characterization of High Molecular Weight PCT Polyester

    • 摘要: 以1,4-环己烷二甲醇(CHDM)、对苯二甲酸(PTA)、均苯四甲酸酐(PMDA)和异氰尿酸三缩水甘油酯(TGIC)为原料,通过直接酯化、减压缩聚和熔融扩链的方法制备了一系列分子量可控的芳香族聚酯——聚对苯二甲酸-1,4-环己烷二甲醇酯(PCT)。采用傅里叶红外光谱(FT-IR)、凝胶渗透色谱(GPC)、差示扫描量热(DSC)、热重分析(TG)、广角X-射线衍射(WXRD)、电子万能试验机分别研究了其分子结构、热性能和力学性能。结果表明:当n(CHDM):n(PTA)=1.2时,用复配催化剂钛酸四丁酯(TBT)、二氧化锗(GeO2)、三氧化二锑(Sb2O3)(用量均为0.1 mg/g)以及醋酸钴(Co(Ac)2)(用量为0.05 mg/g),290℃下缩聚3 h得到数均分子量较大的PCT,特性黏数(η)为0.560 dL/g。PMDA-TGIC联用扩链可以获得特性黏数为0.680 dL/g的扩链PCT,用其制备的薄膜拉伸强度可达27.6 MPa。

       

      Abstract: A series of poly(1, 4-cyclohexylenedimethylene terephthalate) (PCT) with controllable molecular weight was prepared by direct esterification, subsequent polycondensation and molten chain-extending reaction using 1, 4-cyclohexanedimethanol (CHDM), terephthalic acid (PTA), pyromellitic dianhydride (PMDA) and triglycidyl isocyanurate (TGIC) as materials. The molecular structure, thermal and mechanical properties of polymers were characterized by Fourier Transform Infrared Spectrum (FT-IR), Gel Permeation Chromatograph (GPC), Differential Scanning Calorimetry (DSC), Thermal Gravity (TG) analysis, Wide Angle X-ray Diffraction (WAXD) and electronic universal testing machine. Results showed that when n(CHDM):n(PTA) was 1.2, and combined catalysts including tetrabutyl titanate (TBT), germanium dioxide (GeO2), antimony trioxide (Sb2O3) (0.1 mg/g) and cobalt acetate (Co(Ac)2) (0.05 mg/g), reaction 3 h at 290℃, the intrinsic viscosity of PCT was 0.560 dL/g. Then the product was used to react with combination chain-extend agent of PMDA-TGIC, which had the intrinsic viscosity 0.680 dL/g. The films of PCT and chain-extend PCT had excellent mechanical property.

       

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