Hydrogel was moderate crosslinded, branched polymers, widely studied and applied because of the ability to absorb large quantities of water, swell quickly, soft, elastine and biologic consistence.

水凝胶是一种具有三维网络结构的新型功能高分子材料，以其含水量高、溶胀快、柔软、具有橡胶般的粘稠性和良好的生物相容性等优点得到广泛应用及研究。

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Polymers may consist of long chains of unbranched or branched monomers or may be cross-linked networks of monomers in two or three dimensions.

聚合物可能包含由无支链的或有支链的单体组成的长链，也可能是单体连接的耳维或三维网状结构。

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These catalyst systems are generally used to produce polyolefins having broad molecular weight distributions, especially polyethylene. Some systems are used to produce branched or block polymers.

大多数含茂金属的双组分或多组分催化体系用于制备宽分子量分布聚烯烃，尤其是宽分布聚乙烯，少数用于制备支化或嵌段聚合物。

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