Smooth and algebraic invariants of a group action
Smooth and algebraic invariants of a group action
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群作用的光滑和代数不变量
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
I. Kogan
中科院分区：
文献类型：
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作者：
E. Hubert;I. Kogan
本文所述的方法包括在碱金属催化剂如丁基锂的存在下，通过与二乙烯基苯和在任何碳原子上具有不超过一个卤素原子的卤代烷烃的混合物的后反应来转化相对低分子量聚合物的方法，以得到具有改进的耐冷流性、加工性、绿色强度这些改进比单独与二乙烯基苯或卤代烷进行后反应或在共聚过程中存在二乙烯基苯所能实现的改进大得多。卤代烷烃包括氯、溴和碘化合物，并且每个分子可以具有1-4个或甚至更多个卤素原子，条件是在任何碳原子上存在不超过一个卤素原子。
The process described herein involves a method of converting relatively low molecular weight polymers by postreaction with a mixture of divinyl benzene and a haloalkane having no more than one halogen atom on any carbon atom, in the presence of an alkali metal catalyst, such as butyl lithium to give higher molecular weight polymers having improved cold flow resistance, processibility, green strength, etc. The improvements are much greater than can be effected by postreaction with either divinyl benzene or the haloalkane individually, or by having divinyl benzene present during the copolymerization. The haloalkanes include chloro, bromo, and iodo compounds and can have 1-4 or even more halogen atoms per molecule provided there are no more than one halogen atom on any carbon atom.