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首页> 外文期刊>Journal of Applied Polymer Science >Emulsion Polymerization of Styrene with Amphiphilic Random Copolymer as Surfactant: Predominant Droplet Nucleation
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Emulsion Polymerization of Styrene with Amphiphilic Random Copolymer as Surfactant: Predominant Droplet Nucleation

机译：两亲无规共聚物作为表面活性剂的苯乙烯乳液聚合：主要的液滴成核

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摘要

Amphiphilic random copolymer consisting of monomeric units of poly (butyl acrylate) and poly (maleic acid salt) was synthesized and characterized. The emulsion polymerization kinetics of styrene stabilized by this copolymer was investigated. The influencing factors, including polymeric surfactant concentration, initiator concentration and polymerization temperature, were systematically studied. The kinetic data show that the polymerization rate (R-P) increased with the increase of the polymeric surfactant concentration ([S]) and polymerization temperature (T). At the higher [S], droplets nucleation and micelle nucleation coexisted in the polymerization system; at the lower [S], only the droplets nucleation process existed. The polymerization did not follow Smith-Ewart Case 11 kinetics. Dynamic light scatter and transmission electron microscope were utilized to measure the sizes and shapes of the particles, respectively. It would be speculated that a kind of large heterogeneous particles with multiple-active-sites was formed in the polymerization system. The increasing of R-P with increasing initiator concentration ([KPS]) was rapid at a medium [KPS], but the slowly increasing was observed at a lower or higher [KPS]. It was attributed to the barrier effect of the polymeric surfactant around the monomer droplets. The polymerization activation energy was 60.29 kJ/mol.
机译：合成并表征了由聚（丙烯酸丁酯）和聚（马来酸盐）的单体单元组成的两亲无规共聚物。研究了用该共聚物稳定的苯乙烯的乳液聚合动力学。系统地研究了影响因素，包括聚合物表面活性剂浓度，引发剂浓度和聚合温度。动力学数据表明，聚合速率（R-P）随聚合物表面活性剂浓度（[S]）和聚合温度（T）的增加而增加。在较高的[S]下，聚合体系中同时存在液滴形核和胶束形核。在较低的[S]处，仅存在液滴成核过程。聚合反应没有遵循Smith-Ewart Case 11动力学。动态光散射和透射电子显微镜分别用于测量颗粒的大小和形状。可以推测，在聚合体系中形成了具有多个活性位点的大的异质大颗粒。 R-P随引发剂浓度（[KPS]）的增加而增加，在中等[KPS]时迅速，但是在较低或较高[KPS]时观察到缓慢的增加。这归因于聚合物表面活性剂在单体液滴周围的阻挡作用。聚合活化能为60.29kJ / mol。

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