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Kinetics of polymerization and particle stabilization mechanism on dispersion copolymerization of styrene and divinylbenzene

机译：苯乙烯与二乙烯基苯分散共聚的聚合动力学及颗粒稳定机理

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摘要

Monodisperse highly crosslinked microspheres were prepared by dispersion copolymerization of styrene and divinylbenzene in an ethanol/water medium using poly(N-vinylpyrrolidone) (PVP) as the stabilizer. The locus of polymerization and growth of particles were investigated. The polymerization kinetics, average particle diameter (D-n), polydispersity index (PDI), and numbers of particles (N-p) were presented. When the initial styrene concentration is below 20%, the results indicate that the polymerization occurs in the particles, and the particles grow to their final size by the diffusion of monomer and oligomer into the existing particles. The polymerization rate can be described by the equation R-p = k[l](0.87) ([St](1.91) + [DVB](0.09)) (1 + [PVP](0.01)) exp(-45.35/RT). The data from infrared spectroscopy demonstrated that the graft stabilizer was present. The dissolution experiments show that the crosslinking reaction occurred irregularly in batch dispersion polymerization. Using the postaddition approach, up to 3% divenylbenzene (DVB) was successfully incorporated in the synthesis of coagulum-free substance, and monodisperse crosslinked 5 mum microspheres with a superior resistance to solvents have been prepared. (C) 2002 Wiley Periodicals, Inc. [References: 19]
机译：通过使用聚（N-乙烯基吡咯烷酮）（PVP）作为稳定剂，在乙醇/水介质中苯乙烯和二乙烯基苯的分散共聚反应制备单分散的高度交联的微球。研究了聚合和颗粒生长的场所。介绍了聚合动力学，平均粒径（D-n），多分散指数（PDI）和颗粒数（N-p）。当初始苯乙烯浓度低于20％时，结果表明聚合发生在颗粒中，并且颗粒通过单体和低聚物扩散到现有颗粒中而生长到其最终尺寸。聚合速率可以用等式Rp = k [l]（0.87）（[St]（1.91）+ [DVB]（0.09））（1 + [PVP]（0.01））exp（-45.35 / RT）来描述。 。红外光谱数据表明存在接枝稳定剂。溶解实验表明，在间歇分散聚合中，交联反应不规则地发生。使用后添加方法，成功地将高达3％的二乙烯基苯（DVB）掺入到无凝结物的合成中，并制备了具有优异耐溶剂性的单分散交联5微米微球。 （C）2002 Wiley Periodicals，Inc. [参考：19]

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