硬链段

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 .

对苯二甲酸乙二醇酯-ε-己内酯共聚酯中硬链段结晶特性研究

Studies on the Crystallization Characteristics of the Hard Segments in Ethylene Terephthalate - ε - Caprolactone Copolyesters

聚合物的力学性能除了受化学结构影响以外，还与化学组成有关，随体系中PMMA含量和PU中硬链段含量增加，聚合物抗张强度升高，伸长率下降。

As the contents of PMMA and hard segment in PU increase in the system , the tensile strength increases while the elongation at break descends .

以聚酯多元醇作为软链段，以BDO、NPG和MDI作为硬链段一步法合成的鞋底喷漆用聚氨酯固体粒料，并溶解成15%固含量的胶粘剂。

Polyurethane contained soft and hard segment by one-step method which polyol is soft and BDO , NPG and MDI are hard segment .

聚酰胺-聚醚多嵌段共聚物是以结晶型饱和脂肪聚酰胺为硬链段（PA）和无定型脂肪聚醚（PTMG）为软链段的一种尼龙多嵌段共聚物。

The polyamide-polyether multiblock copolymers are the kind of Nylon block copolymers which consist of crystallizable aliphatic polyamide ( PA ) as hard segments and amorphous aliphatic polyether ( PTMG ) as soft segments .

考察了不同筛分方式处理的分子筛对PU/4A分子筛复合材料力学性能、耐溶剂性能的影响，并以DSC分析了分子筛对PU/4A复合材料的硬链段结晶形态及耐热性能。

It was investigated that the effect of different methods of screen separation to zeolite 4A particles on the mechanical properties and solvent resistance of PU / 4A composites . The heat resistance and morphology of hard segment of PU / 4A was analyzed by DSC .

硬链段结晶性嵌段聚醚聚氨酯的合成研究

Studies on crystal hard domain of segmented polyether urethanes

聚氨酯硬链段球晶生长与软硬链锻混容性的关系

Spherulite formation of hard segments and compatibility between soft and hard segments in polyurethanes

对苯二甲酸丁二酯-ε-己内酯多嵌段共聚物中硬链段的受限结晶

The Confined Crystallization of Hard Segments in Butylene Terephthalate - ε - Caprolactone Segmented Copolyesters

利用透射电镜技术对低硬链段含量聚酯-聚醚多嵌段共聚物中硬段结晶的形态进行了研究。

The morphology of segmented copolyether-esters with low hard segment content has been studied by TEM .

差示扫描量热分析表明，水分散过程破坏了亲水性硬链段的有序性。

Differential scanning calorimetry analysis revealed clearly that order of hydrophilic hard segments was destroyed after water dispersion .

利用丙烯酸酯改性以及丙烯酸酯-有机硅复合改性明显降低了聚氨酯分子中硬链段的微区结晶程度。

The acrylate modification and acrylate organosiloxane compound modification can obviously decrease the degree of micro crystal in the molecular of polyurethane .

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 .

对硬段含量超过50%的共聚酯来说，硬链段可以结晶，而软链段不能结晶；

For those copolyesters with hard segment content higher than 50 % , the hard segments can crystallize , while the soft segments can not .