选用三聚氰胺氰尿酸盐(MCA)和10-(2,5-二羟基苯基)-10-氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO-HQ)为阻燃剂,采用熔融共混法制备尼龙56(PA56)/DOPO-HQ、PA56/MCA阻燃复合材料,基于Jeziorny法和Mo法探讨了DOPO-HQ和MCA对PA56非等结晶行为的影响。结果表明:两种阻燃剂均能使PA56晶体的生长方式由二维片状转变为一维针状,但对结晶动力学的作用相反,其中加入DOPO-HQ使PA56的结晶速率减小,半结晶时间延长。Jeziorny法不能准确反映阻燃剂对PA56非等温结晶动力学的影响,而Mo法表明DOPO-HQ削弱了PA56结晶对降温速率的依赖性。可为优化PA复合材料的加工工艺参数和性能调控提供理论支持。
Melamine cyanurate (MCA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO-HQ) were selected as flame retardants,and nylon 56 (PA56)/DOPO-HQ and PA56/MCA flame-retardant composites were prepared via melt blending.The effects of DOPO-HQ and MCA on the non-isothermal crystallization behavior of PA56 were investigated using the Jeziorny and Mo methods.The results showed that both flame retardants altered the growth mode of PA56 crystals from two-dimensional lamellar to a one-dimensional needle-like structure.The effects of DOPO-HQ and MCA on the crystallization kinetics of PA56 were completely opposite.The addition of DOPO-HQ decreased the crystallization rate and prolonged the half crystallization time of PA56.The Jeziorny method was insufficient to adequately describe the influence of the two flame retardants on the non-isothermal crystallization kinetics of PA56.The Mo analysis revealed that incorporating DOPO-HQ effectively mitigated the dependence of PA56 crystallization on the cooling-rate.The results can provide theoretical support for optimizing the processing parameters and property regulation of PA composites.
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基金资助
国家级大学生创新创业训练项目(202411765034);河南省自然科学基金项目(252300421532)
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