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用熔融共混法制备了长玻纤增强聚丙烯/膨胀阻燃剂(LGFPP/IFR)复合材料,采用热烘箱老化法研究了140℃下老化时间对复合材料热氧老化性能的影响。结果表明:随着老化时间的延长,复合材料的力学性能显著下降,说明其分子量降低,发生了明显的热氧化降解。SEM测试结果表明:LGFPP/IFR复合材料表面出现了明显的网状裂纹,局部还出现了较大的裂纹。PP基体分子链的断裂以及长玻纤与PP基体间发生界面脱黏是导致LGFPP/IFR复合材料宏观力学性能下降的主要原因。
The long glass fiber reinforced polypropylene / intumescent flame retardant (LGFPP / IFR) composites were prepared by melt blending method. The effects of aging time at 140 ℃ on the thermal aging properties of the composites were investigated by hot oven aging method. The results showed that the mechanical properties of the composites decreased significantly with the aging time, indicating that the molecular weight of the composites decreased and thermal oxidative degradation occurred obviously. SEM test results show that: LGFPP / IFR composite material surface obvious mesh cracks, local also appeared larger cracks. The fracture of the PP matrix molecular chain and the debonding of the interface between the long glass fiber and the PP matrix are the main reasons for the decrease of macroscopic mechanical properties of LGFPP / IFR composites.