Isothermal Crystallization Kinetics of High-temperature Resistant Polyamides Prepared by Melt Polymerization
WANG Zhongqiang1,2, HU Guosheng1, ZHANG Jingting1, XU Jiusheng2, SHAO Zhengjie3
1 Institute of Macromolecules and Bioengineering,North University of China, Taiyuan 030051; 2 Guangdong Sinoplast Advanced Material Co. Ltd., Dongguan 523860; 3 School of Physics and Telecommunication Engineering,South China Normal University, Guangzhou 510006
Abstract: Poly(decamethylene terephthalamide) (PA10T) and decamethylene terephthalamide-aminoundecanoic copolyamide (PA10T/11) were prepared by melt polymerization. The isothermal crystallization behaviors of PA10T and PA10T/11 were studied by means of differential scanning calorimetry (DSC). The crystallization kinetics under isothermal conditions was analyzed by Avrami equation. It showed that the Avrami equation was applicable for isothermal crystallization very well, and the calculated Avrami index n was from 1.79 to 2.31, which demonstrated that the crystallization of PA10T and PA10T/11 were growing with one or two-dimensional growth crystals in this situation. And then the related kinetics parameters of isothermal crystallization were calculated by Avrami equation. The activation energies for isothermal crystallization of PA10T and PA10T/11 were calculated by Arrhenius equation. The equilibrium melting temperatures of PA10T and PA10T/11 were obtained from Hoffman-Weeks extrapolation. Moreover, the crystal growth mode for PA10T and PA10T/11 was studied by means of Turnbull-Fisher equation and Lauritzen-Hoffman equation. The results of polarized optical microscopy (POM) and X-ray diffraction (XRD) showed that the isothermal crystallization for PA10T and PA10T/11 were one or two-dimensional growth under the experimental conditions. And the spherulite size of PA10T/11 was reduced significantly by the addition of 11-aminoundecanoic acid compared with PA10T.
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2017, Vol. 31 
