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采用分散聚合法以甲基丙烯酸甲酯(MMA)为单体,水/乙醇(H_2O/EtOH)作为分散介质,聚乙烯吡咯烷酮(PVP)为分散稳定剂,芬顿试剂硫酸亚铁(FeSO_4)和双氧水(H_2O_2,30%)在pH=3～4的弱酸性条件下作为引发剂,制备了粒径约为408 nm的单分散聚甲基丙烯酸甲酯(PMMA)微球。探讨反应机理及分散介质的配比、单体浓度、分散稳定剂用量、聚合反应时间等对PMMA微球粒径和分散性的影响。该工艺选用新型引发剂,无需除氧,聚合时间短,操作简单,和传统工艺相比具有明显的优势。
Dispersion polymerization was carried out using MMA as monomer, water / ethanol (H 2 O / EtOH) as dispersion medium, polyvinylpyrrolidone (PVP) as dispersion stabilizer, Fenton’s reagent ferrous sulphate Hydrogen peroxide (H 2 O 2, 30%) was used as initiator to prepare monodispersed polymethylmethacrylate (PMMA) microspheres with a particle size of about 408 nm under weak acid conditions of pH = 3-4. The effects of reaction mechanism, ratio of dispersion medium, monomer concentration, amount of dispersion stabilizer and polymerization time on the particle size and dispersion of PMMA microspheres were discussed. The process uses a new type of initiator, without oxygen, polymerization time is short, simple operation, compared with the traditional process has obvious advantages.