不同树脂配比的GF增强PBT/PET复合材料体系性能

Performances of GF Reinforced PBT/PET Composites with Different Resin Ratios

使用双螺杆挤出机制备了一系列不同树脂配比的玻璃纤维(GF)增强聚对苯二甲酸丁二酯(PBT)/聚对苯二甲酸乙二酯(PET)复合材料,分为未阻燃体系和阻燃体系,研究了PBT/PET质量比、增韧剂甲基丙烯酸缩水甘油酯(GMA)接枝乙烯–辛烯共聚物(POE-g-GMA),GMA接枝乙烯–丙烯酸丁酯共聚物(EBA-g-GMA),乙烯–丙烯酸乙酯共聚物(EEA)及矿物填充对复合材料力学性能、热变形温度(HDT)及熔体流动速率(MFR)的影响。结果表明,当PBT/PET质量比为6∶4时,两种体系的综合性能最好。未阻燃体系中,HDT和MFR随PET含量增加总体呈下降趋势;阻燃体系中,随PET含量增加,HDT基本呈线性递减趋势而MFR总体呈上升趋势;当PET在树脂体系中的质量分数大于30%时,阻燃体系的MFR大于未阻燃体系。POE-g-GMA对未阻燃体系的增韧效果最好,EBA-g-GMA对阻燃体系的增韧效果最好,EEA增韧的两种体系MFR最大。矿物填充使复合材料的力学性能整体下降,滑石粉、硫酸钡在阻燃体系中力学性能保持率较好,云母填充复合材料的整体性能最差。

A series of glass fiber(GF)reinforced polybutylene terephthalate(PBT)/polyethylene terephthalate(PET)composites with different resin ratios were prepared by twin-screw extruder,which are divided into non-flame retardant system and flame retardant system.The effects of PBT/PET mass ratio,toughening agent[glycidyl methacrylate(GMA)grafted ethylene-octene copolymer(POE-g-GMA),GMA grafted ethylene-butyl acrylate copolymer(EBA-g-GMA),ethylene-ethyl acrylate copolymer(EEA)]and mineral filling on mechanical properties,heat distortion temperature(HDT)and melt flow rate(MFR)of composites were investigated.The results show that when PBT/PET mass ratio is 6∶4,the comprehensive properties of the two systems are the best.In the non-flame retardant system,HDT and MFR decrease with the increase of PET content.In the flame retardant system,HDT shows a linear decreasing trend basically while MFR shows a increasing trend with the increase of PET content.When the content of PET in PBT/PET is greater than 30wt%,MFR of the flame retardant system is greater than that of the non-flame retardant system.POEg-GMA has the best toughening effect on the non-flame retardant system while EBA-g-GMA has the best toughening effect on the flame retardant system.MFR of the two systems modified by EEA are the largest.Mechanical properties of PBT/PET composites are decreased by mineral filling.The mechanical properties of talc and BaSO4 are maintained well in the flame retardant system,and mica has the worst effect on the overall properties of the composites.