【摘要】 采用差示扫描量热法(DSC)研究了阴离子原位聚合法制备的铸型尼龙6 (MC尼龙6 ) /TiO2 纳米复合材料的等温结晶行为,并应用Avrami方程分析了MC尼龙6的等温结晶动力学过程。结果表明:纳米TiO2 对MC尼龙6基体具有异相成核作用,使其原位纳米复合材料结晶速率常数变大,半结晶时间变小。Hoffman成核结晶理论计算结果表明,原位纳米复合材料的Kg (与结晶温度无关而与成核方式有关的参数)大于MC尼龙6且随着纳米含量的增加而增加,说明纳米TiO2 阻碍了MC尼龙6分子链的运动,同时尼龙6由晶核生长占主导地位逐渐向成核机制占主导地位转变。更多还原

【Abstract】 The isothermal crystallization behavior of casting nylon6 （MC nylon6）/TiO₂ nano-meter composite prepared by anionic in-situ polymerization was studied by DSC. A modified Avrami equation was applied to the kinetics analysis of the isothermal crystallization. The result showed that nano-meter TiO₂ particles had heterogeneous nucleating effect on MC nylon 6, thus enhanced the crystallization rate of MC nylon 6 and reduced the half time of crystallization. The results calculated by Hoffman theory indicated that the Kg of MC nylon6 in-situ nanocomposites was higher than that of pure MC nylon 6, which showed that the nano-meter TiO₂ was expected to be the obstacle of the molecular chain of MC nylon 6. Meanwhile, the mode of growth of MC nylon crystallite changed into the mode of nucleation gradually.更多还原