聚酯多元醇M_r对热塑性聚氨酯弹性体性能的影响

Influence of polyester polyol M_r on performance of thermoplastic polyurethane elastomer

以聚己二酸乙二醇/丁二醇酯(PEBA)、4,4′–二苯基甲烷二异氰酸酯(MDI)和1,4–丁二醇(BDO)为原料,合成了热塑性聚氨酯弹性体(TPU)。通过控制异氰酸酯指数(R值)和TPU硬段含量,研究了PEBA相对分子质量(Mr)对TPU综合性能的影响。实验结果表明:当R值和硬段含量维持不变时,随聚酯多元醇Mr增加,TPU的回弹性、力学性能、耐磨耗性能和耐低温性能增强。

The thermoplastic polyurethane elastomer （TPU） was synthesized by using polyethylene butylene adipate （PEBA）, 4,4＇-diphenylmethane diisocyanate （MDI） and 1,4-butanediol （BDO） as raw materials. The influence of PEBA relative molecular mass （Mr） on the comprehensive performance of TPU was investigated by controlling isocyanate index （R value） and rigid segment content of TPU. The experimental results show that when R value and rigid segment content remain unchanged, the resiliency, mechanical performance, abrasion resistance and low temperature resistance of TPU are improved with increase of polyester polyol Mr.