【摘要】 采用熔融二步法合成了以环氧乙烷-四氢呋喃无规共聚醚(PET)和聚己二酸乙二醇丙二酯(PEPA)的混合多元醇为软段,1,4-丁二醇(BDO)为扩链剂,不同硬段含量的异佛尔酮二异氰酸酯(IPDI)基和二环已基甲烷二异氰酸酯(HM-DI)基热塑性聚氨酯弹性体(TPU)。通过红外光谱(FT-IR)对TPU的结构进行了表征,利用差示扫描量热(DSC)研究了TPU的热行为,同时测试了两种TPU力学性能。结果表明,与IPDI基TPU相比,相同硬段含量的HMDI基TPU具有更高的力学强度和模量,以及更高的微相分离,同时还具有结晶的特性;IPDI基TPU中硬段与聚酯软段相互作用强于HMDI基TPU,IPDI基TPU不具备结晶特性。更多还原

【Abstract】 Isophorone diisocyanate(IPDI)-based thermoplastic polyurethane(TPU) and dicyclohexylmethane diisocyanate(HMDI)-based TPU,which used the mixtures of tetrahydrofuran-ethylene oxide copolyether(PET) and poly(ethylene-propylene adipate)(PEPA) as soft segment and 1,4-butanediol(BDO) as chain extender,were prepared by bulk polymerization.The experimental techniques utilized were Fourier transform infrared spectrum(FT-IR),differential scanning calorimetry(DSC) and tensile testing to study the properties of the IPDI-based TPU and HMDI-based TPU.The results show that,compared with IPDI-based TPU,HMDI-based TPU has higher tensile strength and Young′s modulus its hard segment is more immiscible with the polyester of the soft segment.Also HMDI-based TPU shows better microphase separation and obvious crystalline structures in contrast to IPDI-based TPU.更多还原