封端剂

1
blocking agent
... free face 临空面 blocking agent 封端剂 water line 吃水线 ...
2
end capping agent
封端剂
3
capping agent
封端剂

1
带水剂、封端剂及其配比对产品粘度、溶解性、颜色等影响不大；
Water-taking agent, capping agent and their ratio didn't largely affect the viscosity, solubility and colourity of product.
2
讨论了封端剂用量、反应温度和时间等因素对封端反应的影响问题。
The effects of amounts of blocking agent, temperature and time on the blocking reaction were studied.
3
简要介绍了不饱和端羟基聚醚的封端方法。讨论了封端剂用量、反应温度和时间等因素对封端反应的影响问题。
The method of blocking unsaturated polyether has been described. The effects of amounts of blocking agent, temperature and time on the blocking reaction were studied.

封端剂
封端剂是指使用有被保护的官能基如缩醛基的烷氧基甲硅烷基化合物作为封端剂来封端阴离子聚合物，生产官能化的聚合物。在缩聚反应中，形成的聚合物两端通常都存在活性功能团，在适宜的功能团存在时，聚合物分子链端仍能继续参与反应，使链长大，为了消除端基的活性，可以加入单官能团化合物，使端基功能团消失，称为封端作用，这些单官能团化合物习惯上称为端基封闭剂，即封端剂。。

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