阻燃剂在提升尼龙(PA)材料阻燃性能的同时,会对其结晶性能产生影响,并进一步影响PA材料的力学性能。为探究10-(2,5-二羟基苯基)-10-氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO-HQ)和三聚氰胺氰尿酸盐(MCA)这两种阻燃剂对尼龙56(PA56)结晶行为和拉伸性能的影响,采用熔融共混法制备了阻燃剂添加质量为5%的PA56阻燃复合材料,分析了复合材料的等温结晶过程、拉伸性能和断裂机制。结果表明:MCA的加入提高了PA56的熔融结晶温度和等温结晶速率,降低了PA56的半结晶时间、结晶活化能和断裂伸长率,DOPO-HQ具有与MCA相反的作用;MCA和DOPO-HQ的加入均能使PA56的Avrami指数由1.99～2.25提高至2.40～3.05,晶体生长模式由二维片状转变为三维球状。
Flame retardants can enhance the flame-retardant properties of PA materials,while can also alter the crystallinity,which in turn affects the mechanical properties of PA materials.To comparatively investigate the effects of 10-(2,5-dihydroxyphenyl)-10-hydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO-HQ) and melamine cyanurate (MCA) on the crystallization behavior and tensile properties of nylon 56 (PA56),flame-retardant PA56 composites with flame retardants addition of 5wt% were prepared by melt blending method.The isothermal crystallization behavior,tensile properties and tensile fracture mechanism of PA56 were analyzed.The results revealed that the addition of MCA increased the melting crystallization temperature and isothermal crystallization rate of PA56,while reducing the half crystallization time,crystallization activation energy,and elongation at break of PA56.The addition of DOPO-HQ had the opposite effect as MCA.Both MCA and DOPO-HQ could increase the Avrami index of PA56 from 1.99～2.25 to 2.40～3.05,shifting the crystallization growth model of PA56 from two-dimensional sheet-like to three-dimensional spherical structure.
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基金资助
国家级大学生创新创业训练项目(202411765034);河南城建学院博士科研启动基金项目(K-Q2021019)
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