此外，高倍拉伸会提高上述二类多嵌段共聚物中软链段结晶的熔点和结晶速率。
In addition, high draw ratio will increase the melting point and crystallization rate of the soft segments for both types of segmented copolymers.
在软链段分子量相同时，聚醚为基础的PUU的相分离程度较聚酯为基础的PUU高。
The polyether-based PUU shows the better phase separation than polyester-based with the same molecular weight of soft segment.
研究表明：硬链段含量、软链段链长的提高和离子基团的增加均有利于拉伸强度的提高。
The results showed that increase hard segment content, soft segment sequence length and ionic group to be favourable for rising tensile strength.
当拉伸倍率大于80 %时，NH基团也发生取向，即在外力作用下，软链段较易取向，而硬链段的取向较难。
NH groups Orient too when draw ratio is beyond 80%, which indicates that it is easy for soft segments but difficult for hard segments to Orient under the effect of outside force.
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 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.
合成了系列水性聚氨酯分散液，就分子链软段中亲水性链段聚乙二醇(PEG)含量对聚氨酯涂膜结晶性的影响进行了探讨。
A series of water - borne polyurethanes were synthesized, and the effect of PEG content in soft - segment on the crystallization of their cast films was studied.
采用一步法合成以4 ，4 '-甲烷二环已基二异氰酸酯（HMDI）、扩链剂1，4 -丁二醇（BDO）为硬段，聚四氢呋喃醚（PTMG）为软段的脂肪族聚氨酯。
The one step method was adopted in this study to synthesize aliphatic polyurethane with 4,4 methylene dicyclohexyl diisocyanate(HMDI), 1,4 butanediol(BDO) and poly (tetrahydrofuran)(PTMG).
采用一步法合成以4 ，4 '-甲烷二环已基二异氰酸酯（HMDI）、扩链剂1，4 -丁二醇（BDO）为硬段，聚四氢呋喃醚（PTMG）为软段的脂肪族聚氨酯。
The one step method was adopted in this study to synthesize aliphatic polyurethane with 4,4 methylene dicyclohexyl diisocyanate(HMDI), 1,4 butanediol(BDO) and poly (tetrahydrofuran)(PTMG).
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