The effects of different chain extenders, amount of extenders, molecular weights of soft segments on the hydrolysis stability of polyurethane are studied and parameters Q, W are introduced.
研究和讨论了不同扩链剂、扩链剂的量以及软段分子量对聚酯型聚氨酯弹性体水解稳定性的影响，并引入了参数Q、W。
The influence of different molecular weights, crystallization behavior and branched chain structures on hard elastic behavior of PE cast films was investigated.
我们分别考察了不同分子量大小、不同结晶行为和不同支链结构对PE流延基膜硬弹性的影响。
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