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。
The isothermal crystallization behavior of casting nylon6 (MC nylon6)/TiO_2 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 TiO_2 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 TiO_2 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.
出处
《塑料工业》
CAS
CSCD
北大核心
2005年第B05期142-145,共4页
China Plastics Industry
基金
福建省青年科技人才创新项目(2003J023)资助课题
