马来酸酐接枝SEBS对热塑性聚酯弹性体发泡性能的影响

摘要

以过氧化二异丙苯（DCP）为引发剂，采用双螺杆熔融挤出技术将马来酸酐（MAH）接枝到氢化聚苯乙烯一聚丁二烯一聚苯乙烯三嵌段共聚物（SEBS）分子链上，通过傅里叶变换红外光谱（FTIR）确定了挤出过程中有SEBS-g-MAH生成，采用酸碱滴定法测定了SEBS-g-MAH的接枝率。通过单螺杆熔融挤出法制备了热塑性聚酯弹性体（TPEE）发泡片材，研究了SEBS-g-MAH对TPEE发泡片材性能的影响。结果表明，接枝物的加入对TPEE的熔体流动速率有显著的降低作用；SEBS-g—MAH对TPEE发泡制品力学性能和表观密度有明显的影响；发泡制品的压缩永久形变和断裂伸长率随着接枝物含量的增多而下降，当接枝物含量加到4份后，压缩永久形变和断裂伸长率都趋于稳定，发泡材料的泡孔大小均匀，分布均一。%Using dicumyl peroxide （DCP） as an initiator agent, maleic anhydride grafted SEBS （SEBS-g-MAH） was prepared via melting reaction in a twin-screw extruder. FTIR indicated that MAH was grafted onto the molecular chain of SEBS. MAH grafting rate was determined by acid- base titration. TPEE foamed sheet was prepared by melting reaction in a single-screw extruder. The effects of SEBS-g-MAH on mechanical properties and apparent density of TPEE foamed sheet were studied. It showed that SEBS-g-MAH decreased the melt flow rate of TPEE obviously. SEBS-g-MAH had a significant impact on the mechanical properties and apparent density of TPEE foamed sheet. With increasing SEBS-g-MAH contents, the compression deformation and elongation at break of foamed sheet decreased. The compression deformation and elongation at break tended to be stable when the SEBS-g-MAH content was 4 phr, and the cells had well distributed in the foamed TPEE, and the cell size was uniform.