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Determination of reactivity ratios for the copolymerization of poly(acrylic acid-co-itaconic acid)

机译:测定聚丙烯酸-共-衣康酸的共聚反应率

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摘要

Monomer reactivity ratios are important parameters used in copolymerization kinetics to predict the rate of polymerization, copolymer composition and monomer sequence length, and by extension, molecular weight and distribution of the final product. Batch aqueous solution copolymerizations of acrylic acid (AA) and itaconic acid (IA) are performed at various feed compositions. Polymerizations are categorized into low (<11 wt %) conversion and higher (<30 wt %) conversion data sets for analysis. Due to the limited solubility of IA in the reaction mixture, the feed composition of IA in all polymerizations is constrained to lower than 25 mol %. Conversion is determined by gravimetric methods, and copolymer composition via H-1-NMR spectroscopy. All data are analyzed using the error-in-variables model (EVM) method. Two analyses are used, one with the EVM approach and another with a novel Direct Numerical Integration (DNI) coupled with the EVM method. The DNI/EVM approach yields values of r(AA) = 0.36 and r(IA) = 1.62 for the reactivity ratios. (C) 2016 Wiley Periodicals, Inc.
机译:单体反应性比率是用于共聚动力学的重要参数,可预测聚合速率,共聚物组成和单体序列长度,以及延伸,最终产物的分子量和分布。在各种进料组成下进行丙烯酸(AA)和衣康酸(IA)的间歇水溶液共聚。聚合可分为低(<11 wt%)转化率和更高(<30 wt%)转化率数据集以进行分析。由于IA在反应混合物中的溶解度有限,因此IA在所有聚合反应中的进料组成均被限制为低于25mol%。通过重量法确定转化率,并通过H-1-NMR光谱确定共聚物组成。使用变量误差模型(EVM)方法分析所有数据。使用了两种分析,一种是采用EVM方法,另一种是采用新颖的直接数值积分(DNI)与EVM方法相结合。对于反应率,DNI / EVM方法得出的值r(AA)= 0.36,r(IA)= 1.62。 (C)2016威利期刊公司

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