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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of thermoplastic polyurethanes as binder for novel thermoplastic propellant
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Synthesis and characterization of thermoplastic polyurethanes as binder for novel thermoplastic propellant

机译：热塑性聚氨酯作为新型热塑性推进剂的粘合剂的合成与表征

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Two series of thermoplastic polyurethanes (TPUs), which used nitroester plasticiable tetrahydrofuran-ethylene oxide random copolyether as soft segment and adduction products of isophorone diisocyanate (IPDI) and toluene diisocyanate (TDI) with 1,4-butanediol as hard segments respectively, were successfully synthesized as binders for novel thermoplastic propellant. Mechanical tests and DSC techniques were applied to make characterizations of the polymers in order to choose candidate materials. Results shown that the TPU based on IPDI with fraction of the hard segment around 45% will meet requirements of propellant in terms of mechanical properties and glass transition of the soft segment phase. The results were further manifested in detail by quantitative studies of the degree of microphase separation as well as hydrogen bonding within the hard segment domain based on the equations established through FTIR and DSC analyses. It was found that mixing of two phases, which mainly referred to the mount of the hard segment dissolving into the soft segment phase, was as little as 10% in IPDI series TPUs, whereas it was almost up to 30% in TDI series. This indicated that better phase separation was achieved in IPDI series TPU. By contrast, studies of hydrogen bonding in domain revealed that the domain of TPUs prepared with TDI was much oriented in comparison with that with IPDI, which indicated higher processing temperatures. The results were raised by the melting index results under required conditions. (C) 2002 John Wiley Sons, Inc. [References: 8]
机译：成功地使用了两个系列的热塑性聚氨酯（TPU），分别使用可硝基酯可塑的四氢呋喃-环氧乙烷无规共聚醚作为软链段，以及分别以1,4-丁二醇为硬链段的异佛尔酮二异氰酸酯（IPDI）和甲苯二异氰酸酯（TDI）的加合物。用作新型热塑性推进剂的粘合剂。应用机械测试和DSC技术对聚合物进行表征，以选择候选材料。结果表明，基于IPDI的TPU的硬链段比例约为45％，在机械性能和软链段相的玻璃化转变方面将满足推进剂的要求。通过基于FTIR和DSC分析建立的方程式，对硬段区域内的微相分离程度和氢键进行定量研究，结果进一步得到了详细证明。发现在IPDI系列TPU中，两相的混合（主要是指将硬链段溶解到软链段中）的比例仅为10％，而在TDI系列中则高达30％。这表明在IPDI系列TPU中实现了更好的相分离。相比之下，在域中氢键的研究表明，与IPDI相比，用TDI制备的TPU的域取向更强，这表明处理温度更高。在所需条件下，该结果由熔融指数结果提高。 （C）2002 John Wiley Sons，Inc. [参考：8]

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