Polyacetaldehyde may exist in atactic , syndiotactic and isotactic forms .

聚乙醛可以以无规，间同和全同形式存在。

The best way to represent the isotactic structure is with molecular models .

表示等规结构的最好方法是用分子模型。

High isotactic poly ( 1-butene ) ( ipb ) was synthesized with ziegler-natta catalyst , and the effects of three external electron donors on polymerization of 1-butene were investigated .

用ziegler-natta催化剂合成高全同结构的聚1-丁烯，考察了3种硅烷类外给电子体对1-丁烯聚合的影响。