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首页> 外文期刊>Journal of Applied Polymer Science >Poly(styrene-co-N-butylmaleimide) Macroinitiators by Controlled Autopolymerization and Related Block Copolymers
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Poly(styrene-co-N-butylmaleimide) Macroinitiators by Controlled Autopolymerization and Related Block Copolymers

机译：受控自聚合的聚（苯乙烯-共-N-丁基马来酰亚胺）大分子引发剂及相关嵌段共聚物

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摘要

Autopolymerization of styrene-N-butylmaleimide mixtures at 125 or 140 deg C in the presence of a stable nitroxyl radical [2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO)] was found to proceed in a pseudoliving manner.Unimolecular initiators,which were originated by trapping self-generated radicla species with TEMPO,took part in the process.Under the studied experimental conditions,the TEMPO-controlled autopolymerization with a varying comonomer ratio provided virtually alternating copolymers of narrow molecular weight distributions.The molecular weights of the copolymers increased with conversions.The obtained styrene-N-butylmaleimide copolymers containing TEMPO end groups were used to initiate the polymeriation of styrene.The polymerization yielded poly(styrene-co-N-butylmaleimide)-polystyrene block copolymers with various polystyrene chain lengths and narrow nolecular weight distributions.The copositions,molecular weights,and molecular weight distributions of the synthesized block copolymers and the initial poly(styrene-co-N-butylmaleimide) precursors were evaluated usign nitrogen analysis,gel permeation chromatography,and ~1H- and ~(13)C-NMR spectroscopy.
机译：发现在稳定的硝酰基自由基[2,2,6,6-四甲基哌啶-1-基氧基（TEMPO）]存在下，苯乙烯-N-丁基马来酰亚胺混合物在125或140℃下自聚合以拟活性方式进行。引发剂是通过在TEMPO中捕获自生的辐射物种而产生的。在研究的实验条件下，具有不同共聚单体比率的TEMPO控制的自聚合提供了实际上窄分子量分布的交替共聚物。共聚物的数目随转化率的增加而增加。使用获得的具有TEMPO端基的苯乙烯-N-丁基马来酰亚胺共聚物引发苯乙烯的聚合。聚合反应产生了具有不同聚苯乙烯链长的聚（苯乙烯-co-N-丁基马来酰亚胺）-聚苯乙烯嵌段共聚物和窄的分子量分布。合成的嵌段共聚物的组成，分子量和分子量分布使用氮气分析，凝胶渗透色谱法和〜1H-和〜（13）C-NMR光谱对lymer和初始聚（苯乙烯-co-N-丁基-马来酰亚胺）前体进行了评估。

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