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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。
Poly (ethylene adipate) / polybutylene adipate (PEBA), 4,4’-diphenylmethane diisocyanate (MDI) and 1,4-butanediol (BDO) Body (TPU). By controlling the isocyanate index (R value) and the hard segment content of TPU, the influence of the relative molecular weight (PE) of PEBA on the overall properties of TPU was studied. The experimental results show that with the increase of polyester polyol Mr, the resilience, mechanical properties, abrasion resistance and low temperature resistance of TPU increase with the increase of R value and hard segment content.