回收聚对苯二甲酸丁二醇酯的强韧化与耐热改性

Reinforcement,Toughening and Heat⁃resistant Modification of Recycled Poly(butylene terephthalate)

以回收聚对苯二甲酸丁二醇酯(r-PBT)为原料,通过反应性熔融共混制备了r-PBT/环氧化弹性体(EVMG)共混物,并研究了EVMG添加量对r-PBT力学性能的影响规律。结果表明,当EVMG质量分数为20%时,EVMG能够均匀分散于r-PBT中,粒径仅为500 nm,致使r-PBT的缺口冲击强度提高了14倍,断裂伸长率提高了7倍;进一步添加玻璃纤维(GF),使r-PBT/EVMG共混物的拉伸强度和耐热性显著提高;与纯r-PBT相比,添加质量分数为30%GF后的r-PBT/EVMG/GF共混物在保持高韧性的同时,拉伸与弯曲强度提高70%以上,且共混物的热变形温度达到176℃,为回收PBT材料的高值再利用提供了新方法。

The recycled poly(butylene terephthalate)(r-PBT)/epoxidized elastomer(EVMG)blends were prepared by a reactive melt blending method using r-PBT as a raw materials.The effect of EVMG on the mechanical properties of r-PBT blends was studied systematically.The results indicated that EVMG was uniformly dispersed in the r-PBT matrix and its particle diameter was determined to be 500 nm.The notched impact strength and the elongation at break of the(r-PBT)/(EVMG)blends increased by 14 times and 7 times at an EVMG content of 20 wt%,respectively.Furthermore,glass fibers(GF)were incorporated to improve the mechanical strength and heat resistance of the blends.After adding 30 wt%GF,the tensile strength and flexural strength of r-PBT/EVMG/GF composites increased by 70%with good toughness maintained.In addition,the thermal deformation temperature of the blends increased up to 176℃.This work provides a new idea for the reuse of r-PBT.