It's caused by the micro phase separation degree of TPU is increased as well as the soft hard segment structure is perfected.
研究认为热处理提高了TPU的微相分离程度，完善了TPU中的软硬段结构。
The effects of hard segment structure, hard segment content and chain extender with different structure on physical mechanical properties of dry films and water absorption were studied.
研究了不同硬段结构和硬段含量和扩链剂对其干膜物理机械性能和吸水率的影响。
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