Abstract In this work, for a semicontinuous emulsion polymerization reaction, it is shown that using a redox initiation system at 40°C, substantial modifications in copolymer chain composition with conversion can be easily obtained. To test controllable trajectories for comonomer feeding, linear and parabolic profiles were chosen to get different types of chain composition variations for the 50/50 w/w styrene/n-butyl acrylate system. For the “forced composition copolymers,” the molecular weight averages and distribution were obtained by size exclusion chromatography. The composition along conversion was followed by proton nuclear magnetic resonance to determine the weight composition distribution (WCD) of the copolymer chains. Mechanodynamic (dynamic-mechanical analysis), tensile, and hardness tests exhibited consistent results depending on the WCD that outcomes from the respective feeding profile. The results confirm that this methodology is of great potential for industrial applications when looking for synergy in copolymer properties, and low-cost processes.

中文翻译：

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半连续聚合中的氧化还原引发以寻找共聚物的特定机械性能

摘要 在这项工作中，对于半连续乳液聚合反应，表明在 40°C 下使用氧化还原引发体系，可以很容易地获得共聚物链组成的实质性改变和转化。为了测试共聚单体进料的可控轨迹，选择线性和抛物线曲线以获得 50/50 w/w 苯乙烯/丙烯酸正丁酯系统的不同类型的链组成变化。对于“强制组合共聚物”，分子量平均值和分布是通过尺寸排阻色谱法获得的。伴随转化的组成随后进行质子核磁共振以确定共聚物链的重量组成分布(WCD)。机械动力学（动态-机械分析）、拉伸、和硬度测试显示出一致的结果，这取决于从各自喂食曲线得出的 WCD。结果证实，当寻求共聚物性能和低成本工艺的协同作用时，这种方法在工业应用方面具有巨大的潜力。