Abstract Dispersion copolymerization of styrene (St) with either acrylonitrile (AN) or methyl methacrylate (MMA) in 1-propanol/deionized water medium were carried out using Bisomer S20W (polyethylene oxide macromonomer with a methacrylic end group) as stabilizer. The serums of the St/AN and St/MMA latexes were characterized in terms of molar mass and composition by the combination of Size Exclusion Chromatography (SEC) and Matrix Assisted Laser Desorption Ionization Time of Flight Mass Spectrometry (MALDI-TOF MS). This work demonstrates that the combination of SEC and MALDI techniques is necessary for an accurate identification of the composition and molar mass of the oligomeric species present in the continuous phase of a dispersion polymerization that cannot be achieved by using either SEC or MALDI alone. For the particular latexes analyzed in this work it was found that unreacted macromonomer was present in both copolymer systems. However, in the case of the copolymerization with AN besides the presence of the macromonomer there were also some pAN oligomers.

中文翻译：

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结合 SEC 和 MALDI 表征分散聚合中的连续相

摘要 使用 Bisomer S20W（具有甲基丙烯酸端基的聚环氧乙烷大分子单体）作为稳定剂，在 1-丙醇/去离子水介质中进行了苯乙烯 (St) 与丙烯腈 (AN) 或甲基丙烯酸甲酯 (MMA) 的分散共聚。St/AN 和 St/MMA 乳胶的血清通过尺寸排阻色谱 (SEC) 和基质辅助激光解吸电离飞行时间质谱 (MALDI-TOF MS) 的组合在摩尔质量和组成方面进行表征。这项工作表明，SEC 和 MALDI 技术的组合对于准确识别分散聚合连续相中存在的低聚物质的组成和摩尔质量是必要的，而单独使用 SEC 或 MALDI 无法实现这一点。对于在这项工作中分析的特定胶乳，发现两种共聚物体系中都存在未反应的大分子单体。然而，在与 AN 共聚的情况下，除了存在大分子单体外，还有一些 pAN 低聚物。