木粉/低熔点尼龙6复合材料的非等温结晶动力学

Non-isothermal crystallization kinetics of wood powder/low melting point polyamide 6 composites

利用LiCl改性尼龙6(PA6),并将其与木粉熔融共混制备了木粉/低熔点PA6复合材料,通过DSC法研究了木粉/低熔点PA6复合材料的非等温结晶动力学行为。结果表明,LiCl降低了PA6的熔点、结晶温度、结晶度和结晶速率,提高了PA6的结晶活化能。木粉是良好的成核剂,能够加快PA6的结晶速率,但却降低了其结晶度。通过Mo法分析木粉/低熔点PA6复合材料的非等温结晶动力学,结果表明,与纯PA6和木粉/PA6复合材料相比,低熔点PA6的F(T)值(表征聚合物结晶快慢参数)最大,LiCl提高了PA6在单位结晶时间内达到一定结晶度时所需的冷却速率,而木粉则与之相反。

The polyamide 6(PA6)modified by LiCl was compounded with wood powder in the molten state to prepare wood powder/low melting point PA6 composites.The non-isothermal crystallization kinetics of the wood powder/low melting point PA6 composites was investigated via DSC.The results show that LiCl reduces the melting point,crystallization temperature,crystallinity and crystallization rate of PA6,while increases the crystallization activation energy.As a nucleating agent,the wood powder increases the crystallization rate of PA6,but decreases the crystallinity.The non-isothermal crystallization kinetics of the wood powder/low melting point PA6 composites were analyzed by Mo equation.The results show that F(T)value(the parameters of crystallization rate)of the low melting point PA6 is higher than that of pure PA6 and the wood powder/PA6 composites.LiCl increases the cooling rate required for PA6 to reach a relative crystallinity in unit time.On the contrary,wood powder reduces the cooling rate.