Cis 1,4-polybutadiene synthesized by rare-earth catalyst has high cis content, high degree of molecular reqularity and low degree of branching.
用稀土催化剂得到的顺-1，4-聚丁二烯具有顺式含量高，支化度小及分子链结构规整性好等特点。 在常温下为非晶态，但在低温下易于结晶，因而具有较高的力学性能。
The aim of the present invention is to provide a multi-branched polymer, in which branch terminals can be easily modified and which have a high degree of branching and narrow dispersion.
本发明的目的在于提供支链末端容易修饰、支化系数高、而且分散窄的多支链高分子。
Branching degree of the polyethylenes and the content of methyl branch rise quickly with reaction temperature, but the content of long branches drops remarkably.
随着温度的升高聚乙烯产物支化度和甲基支链含量都迅速增加，长支链含量则显著下降。
DSC analysis showed that polyethylene with higher branching degree had lower melting point when relative molecular masses of the polymers were approximate.
差示扫描量热分析结果表明，当相对分子质量相差不大时，支化度较高的聚乙烯具有较低的熔点。
The rheological behaviors of agarose derivatives with different branching chains, degree of substitute and gelling temperature were studied.
研究了具有不同支链、取代度和胶凝温度的琼脂糖衍生物的流变行为。
The rheological behaviors of agarose derivatives with different branching chains, degree of substitute and gelling temperature were studied.
研究了具有不同支链、取代度和胶凝温度的琼脂糖衍生物的流变行为。
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