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首页> 外文期刊>Journal of Applied Polymer Science >A kinetic investigation of thermally initiated emulsion copolymerization of styrene and methylmethacrylate without conventional initiators
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A kinetic investigation of thermally initiated emulsion copolymerization of styrene and methylmethacrylate without conventional initiators

机译：不使用常规引发剂的苯乙烯和甲基丙烯酸甲酯热引发乳液共聚的动力学研究

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摘要

The thermally initiated emulsion copolymerization of styrene (ST) and methyl methacrylate (MMA) was carried out in the absence of conventional initiators. The hydroperoxide (HPO) concentration in the monomers, sodium dodecyl sulfate (SDS), deionized water, and the formulation of those for emulsion copolymerization were measured. The HPO concentration in ST and MMA increased with the storage time, and were considered to be the major sources of HPO. The thermal decomposition of hydroperoxide in monomers, the thermal initiation of ST by Mayo mechanism, and the complex formation between SDS and the monomers were proposed to be three main sources of the radical generation. It was confirmed that new polymer particles were generated throughout the polymerization process, and consequently resulted in a broader distribution of polymer particle size, compared with that for conventional emulsion polymerization. Approximately 80 wt % of monomer conversion was obtained in the presence of SDS at 373 K in 24 h. The initiation rate of the 30 wt % monomer charge was faster than those of 10 wt % and 20 wt % monomer charge. The latex instability at higher solid content was improved by adding electrolyte to promote the electrostatic repulsion force between the polymer particles. (C) 2002 John Wiley Sons, Inc. [References: 35]
机译：在没有常规引发剂的情况下进行苯乙烯（ST）和甲基丙烯酸甲酯（MMA）的热引发乳液共聚。测量了单体中的过氧化氢（HPO）浓度，十二烷基硫酸钠（SDS），去离子水以及用于乳液共聚的配方。 ST和MMA中HPO的浓度随储存时间的增加而增加，被认为是HPO的主要来源。氢过氧化物在单体中的热分解，通过Mayo机理引起的ST的热引发以及SDS与单体之间的络合物形成被认为是自由基产生的三个主要来源。证实了与常规乳液聚合相比，在整个聚合过程中产生了新的聚合物颗粒，因此导致了聚合物粒径的更广泛分布。在SDS存在下于24小时内在373 K下获得约80 wt％的单体转化率。 30wt％单体进料的引发速率比10wt％和20wt％单体进料的引发速率快。通过添加电解质以提高聚合物颗粒之间的静电排斥力，可以改善较高固含量下的胶乳不稳定性。 （C）2002 John Wiley Sons，Inc. [参考：35]

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