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首页> 外文期刊>Journal of Applied Polymer Science >Comparison of Properties of Thermoplastic Polyurethane Elastomers with Two Different Soft Segments
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Comparison of Properties of Thermoplastic Polyurethane Elastomers with Two Different Soft Segments

机译：两种不同软链段的热塑性聚氨酯弹性体的性能比较

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摘要

Two series of thermoplastic polyurethand elastomers[poly(propylene glycol)(PPG)based PP smples and poly(oxytetramethylene)glycol (PTMG)based PT samples]were synthesized from isophorone diisocyanate(IPD)/1,4-butanediol(BD)/PPG and IPDI/BD/PTMG.The TPDI/BD based hard segments contents of polyurethane prepared in this study were 40-73 wt %.These polyurethane elastomers had a constant soft segment molecular weight (average M_n,2000) but a variable hard segment block length(n,3.5-17.5;average M_n,1318-5544).Studies were made on the effects of the hard segment content on the dynamic mechanical thermal properties and elastic behaviors of polyurethane elastomers.These properties of PPG based PP and PTMG based PT samples were compared.As the hard segment contents of PP and PT samples increased,hynamic tensile modulus and #alpha#-type glass transition temperature(T_g)increased;however,the #beta#-type T_g decreased.The permanent set (%) increased with increasing hard segment content and successive maximum elongation.The permanent set of the PT sample was lower than that of the PP sample at the same hard segment content.
机译：由异佛尔酮二异氰酸酯（IPD）/ 1,4-丁二醇（BD）/ PPG合成了两个系列的热塑性聚氨酯和弹性体[基于聚丙二醇（PPG）的PP样品和基于聚（氧四亚甲基）二醇（PTMG）的PT样品]本研究制备的基于TPDI / BD的聚氨酯硬链段含量为40-73 wt％，这些聚氨酯弹性体的软链段分子量恒定（平均M_n，2000），而硬链段嵌段可变长度（n，3.5-17.5;平均M_n，1318-5544）。研究硬链段含量对聚氨酯弹性体动态力学热性能和弹性行为的影响.PPG基PP和PTMG基PT随着PP和PT样品硬段含量的增加，动态拉伸模量和＃alpha＃型玻璃化转变温度（T_g）升高;而＃beta＃型T_g降低。永久变形（％）随着硬段内容的增加和成功而增加在相同的硬链段含量下，PT样品的永久变形低于PP样品的永久变形。

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