...玻璃化转变温度 但 树枝状聚合物和超支化聚合物之间也有显著的差别 超支化聚合物的最显著特 征是它的支化度(degree of branching )DB或者说是支化因素 branching factor 它决定了聚合物结构中支化单元 末端单元 线性单元之间的比例 据定义 树枝状聚合物的DB 为...
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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。
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