关键词: 甲基丙烯酸甲酯, 苯乙烯, 聚硅氧烷, 核壳微球, 光散射剂

Abstract:

Micron-size poly(methyl methacrylate-co-styrene)/polysiloxane core/shell microspheres were synthesized.Firstly, poly(methyl methacrylate-co-styrene）microspheres were prepared by dispersion copolymerization and acted as seed microspheres.Secondly, methyl trimethoxylsilane was hydrolyzed, mixed with the seed microspheres and then condensed to generate polysiloxane shells on the surface of seed microspheres by adding aqueous NH₄OH as catalyst.The morphology, core/shell structure, size and chemical structure of the core/shell microspheres were investigated by SEM, TEM, size analyzer and FTIR, respectively.The refractive indices of the relevant core/shell microspheres decreased with increasing feed amount of methyl methacrylate in the co-monomers in the seeds.The microspheres as light scattering agents were blended with polymethyl methacylate（PMMA）resin to prepare a light scattering material.The results indicated that core/shell microspheres could significantly improve the haze of PMMA sheet (2 mm）and the haze of PMMA sheet was enhanced corresponding to the increase of Δn, the difference of refractive indices between light scattering agents and PMMA.When the concentration of core/shellmicrospheres was between 2% and 3%(mass), the light scattering material with effective light scattering coefficient more than 55% could be obtained.

Key words: 甲基丙烯酸甲酯, 苯乙烯, 聚硅氧烷, 核壳微球, 光散射剂