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以苯乙烯(St)为主单体,甲基丙烯酸环氧丙酯(GMA)为功能单体,聚乙烯吡咯烷酮(PVP)为分散剂,乙醇和水的混合物为反应介质,选用两性偶氮二(N-2-羧乙基-2-甲基丙脒)水合物(VA-057)为该体系的引发剂,分散聚合制备了单分散的聚(苯乙烯-甲基丙烯酸环氧丙酯)(PSG)高分子微球。考察了单体配比、引发剂及分散剂用量、醇水比等因素对高分子微球表面环氧基团浓度、粒径及单分散性的影响。研究表明,PSG微球粒径(6~9μm)和表面环氧基团浓度(2~4mmol/g)具有可控性。单体配比中GMA含量增加,PSG微球的表面环氧基团浓度和粒径均增大。乙醇/水介质中水含量增大或引发剂用量增多,粒径变大。分散剂用量增多,粒径变小。但引发剂浓度过高或单体St与GMA的质量比>1时,会导致粒径分布变宽。
With styrene (St) as main monomer, glycidyl methacrylate (GMA) as functional monomer, polyvinylpyrrolidone (PVP) as dispersant and a mixture of ethanol and water as reaction medium, amphoteric azobis (N-2-carboxyethyl-2-methylpropionamidine) hydrate (VA-057) was used as the initiator of this system to prepare a monodisperse poly (styrene- glycidylmethacrylate) (PSG) polymer microspheres. The effects of monomer ratio, initiator and dispersant dosage, alcohol-water ratio on the epoxy group concentration, particle size and monodispersity on the surface of polymer microspheres were investigated. The results show that the particle size of PSG microspheres (6 ~ 9μm) and the surface epoxy group concentration (2-4mmol / g) are controllable. The content of GMA in the monomer mixture increased, and the concentration and size of epoxy groups on the surface of PSG microspheres increased. Increased water content in ethanol / water media or increased amount of initiator, particle size becomes larger. Increasing the amount of dispersant, particle size smaller. However, when the initiator concentration is too high or the mass ratio of monomer St to GMA is larger than 1, the particle size distribution will be broadened.