摘要
研究了表面处理剂(钛酸酯和硅烷偶联剂)对聚丙烯/纳米氢氧化镁(MH)阻燃复合材料性能的影响。通过高压毛细管流变仪、LO I、力学测试、DSC和SEM对PP/纳米MH复合体系的结构与性能进行了研究。结果表明,所选偶联剂能有效地降低复合体系的表观黏度,改善体系的流动性。未改性的纳米MH对PP基体有异相成核作用;而表面改性剂能削弱填料对基体的异相成核作用。改性后的纳米MH粒子以独立形式均匀分散在基体中,PP与纳米MH界面的粘接力得到了加强,复合材料的拉伸性能和冲击强度有较大幅度的提高,阻燃性能也得到了改善。
Nano-magnesium hydroxide (MH), which was modified by titanate and silane, respectively, was filled into polypropylene as a fire retardant. The effects of surface treatment on the structure and the properties of PP/MH composites were studied by rheological behaviors, mechanical tests, LOI, DSC and morphology studies. The results show that addition of nano-MH can improve flame retardancy of PP/MH composites, but deteriorate mechanical properties of composites. However, PP matrix filled with treated nano-MH can improve significantly tensile and impact strength of PP/MH composites and has little effect on flame retardancy and elongation at break of the composites. PP filled with treated nano-MH powders decreases melt viscosity of PP/MH composites, which improves their processing behavior. Nano-MH has heterogeneous nucleation on PP matrix and makes crystallization peak temperature increased. However, surface modifier can weaken heterogeneous nucleation of MH on PP/MH composites. Interfacial adhesion of PP/MH composites is significantly improved, as seen in morphology studies in the changed fracture mechanism.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2006年第5期170-174,共5页
Polymer Materials Science & Engineering
基金
国家863计划项目(2003AA32X230)
国家重点基础研究发展计划(973)项目(2005CB623800)资助
关键词
聚丙烯
纳米氢氧化镁
表面处理
力学性能
流变性
结晶
polypropylene
nano-Mg (OH)2
surface treatment
mechanical properties
rheology
crystallization