Stereochemical configuration of 2‐hydroxyethyl methacrylate/styrene copolymers obtained in N,N′‐dimethylformamide solution over a whole range of conversion

Carmen Fernández-Monreal, M. Sánchez-Chaves, G. Martínez, E. Madruga
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引用次数: 11

Abstract

High resolution 1 H-NMR spectra of 2-hydroxyethyl methacrylate (HEMA)-styrene (S) copolymers prepared at low conversion by free radical copolymerization in N,N-dimethylformamide (DMF) solution at 50°C, have been analyzed in terms of sequence distribution and stereoregularity. The Bootstrap effect for the HEMA/S/DMF system was confirmed by comparison of the data obtained with those previously reported for the HEMA/S/bulk system. Reactivity ratios, statistical parameters, and the coisotacticity parameter σ HS = 0.40, estimated at low conversion, were used to describe the observed experimental changes in copolymer composition and triad fraction intensities over a wide range of conversions.
在N,N ' -二甲基甲酰胺溶液中获得的2‐甲基丙烯酸羟乙酯/苯乙烯共聚物的立体化学构型
用自由基共聚法在N,N-二甲基甲酰胺(DMF)溶液中低转化率制备了2-甲基丙烯酸羟乙酯(HEMA)-苯乙烯(S)共聚物,并在50℃下对其高分辨率1h - nmr谱进行了序列分布和立体规则性分析。通过与先前报道的HEMA/S/bulk系统的数据比较,证实了HEMA/S/DMF系统的Bootstrap效应。用反应性比、统计参数和低转化率时估计的共等规参数σ HS = 0.40来描述在大范围转化率下共聚物组成和三元分数强度的实验变化。
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