Preparation and characterization of some star‐and comb‐type branched polystyrenes
Preparation and characterization of some star‐and comb‐type branched polystyrenes
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星型和梳型支化聚苯乙烯的制备及表征
DOI：
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发表时间：
1965
期刊：
影响因子：
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通讯作者：
Klaus Meyersen
中科院分区：
文献类型：
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作者：
T. Altares;D. P. Wyman;V. Allen;Klaus Meyersen
星型聚苯乙烯（具有连接到共同多官能中心的p支链的聚合物）和梳型聚苯乙烯（平均具有随机连接到聚合物主链的p支链的聚合物）分别通过窄链长分布的聚苯乙烯基锂与适当的p-官能分子或与窄链长分布的聚苯乙烯主链的反应制备，含有必要数量的苄基型氯甲基。这些类型的聚合物的合成，分离和表征的说明通过具体的例子。系统固有的问题，例如，讨论了金属-卤素交换反应、氯甲基的不同反应性、聚苯乙烯基锂的异构化以及其他可能的反应及其后果。
Star-type polystyrenes, polymers with p branches attached to a common multifunctional center, and comb-type polystyrenes, polymers with an average of p branches attached at random to a polymeric backbone, have been prepared by the reactions, respectively, of polystyryllithium of narrow chain length distribution with appropriate p-functional molecules or with backbone polystyrene chains of narrow chain length distribution, containing the prerequisite number of benzylic-type chloromethyl groups. The synthesis, isolation, and characterization of these types of polymers are illustrated by specific examples. Problems which are inherent to the system, e.g., metal–halogen interchange reactions, different reactivities of the chloromethyl groups, isomerization of the polystyryllithium, and other possible reactions and their consequences are discussed.