交联核壳结构PBA/PS和PBA/PMMA纳米微球的制备与应用

考察了聚丙烯酸丁酯/聚苯乙烯(PBA/PS)以及聚丙烯酸丁酯/聚甲基丙烯酸甲酯(PBA/PMMA)交联核壳结构纳米高分子微球的制备方法,并对其在尼龙复合材料中的应用进行了初步研究.结果表明,通过交联剂的引入使粒子核层和壳层内部均形成了高度交联的结构,可以限制亲水性较小的聚苯乙烯(PS)壳层向粒子内部迁移的趋势;制备出的微球平均粒径为40~50 nm,粒径分布很窄.采用饥饿态加料方式加入第二单体不仅可以使微球具有较高的产率和凝胶率,而且可以使其具有更理想的核壳结构和更窄的粒径分布.此外,将合成出的PBA/PMMA核壳粒子对尼龙6基体进行复合的结果表明,由于该微球表面与尼龙6基体之间具有较强的界面相互作用且微球具有较大的形变能力,可以在基体中形成良好的分散,在保持材料强度的同时有效地提高了其刚性和韧性.

PREPARATION AND APPLICATION OF CROSSLINKED CORE-SHELL PBA/PS AND PBA/PMMA NANOPARTICLES

Crosslinked core-shell(poly(butyl) acrylate)/polystyrene(PBA/PS) and (poly(butyl) acrylate)/poly-(methyl methacrylate)(PBA/PMMA) nanoparticles were preparation via seeded emulsion polymerization.High crosslinked structure formed in both the core and the shell due to using crosslinking agent,which prevented the migration of hydrophobic PS shell to the inside of particles.There were covalent bonds on the interfaces between the cores and the shells in both particles.The average particle sizes were 40～50 nm,and the size distributions were narrow.The kinetics was investigated.Well-defined core-shell structure and narrow particle sige distribution could be achieved under starved conditios of monomer Ⅱ feeding.Furthermore,PBA/PMMA particles were filled in nylon 6 matrix and increased the tensile modulus and impact strength by 38% and 31%,respectively.