【摘要】 采用热引发体系,以聚丙烯酸正丁酯为核层,聚甲基丙烯酸甲酯为壳层,并在最外层共聚功能单体甲基丙烯酸,以种子乳液聚合法制备了聚丙烯酸酯核-壳粒子;研究了不同核层交联密度的聚丙烯酸酯对尼龙6的增韧作用。结果表明,在乳液聚合反应中,单体转化率高,聚丙烯酸酯核-壳粒子的结构和组成可控,粒径在295 nm;当核层与壳层聚合物的质量比为85/15,核层交联剂用量和甲基丙烯酸均为单体总质量的0.5%时,尼龙6共混物的缺口冲击强度最高,是纯尼龙的7倍。更多还原

【Abstract】 With poly( n-butyl acrylate) as core layer, polymethylmethacrylate as shell layer and methylacrylic acid as a functional monomer copolymerized in the outermost shell layer,polyacrylate core-shell structured particles were prepared by seeded emulsion polymerization using thermal initiation system. The toughening effect of polyacrylate with different crosslinking density of the shell layer on nylon 6 was studied.The results indicated that in the emulsion polymerization,the monomer conversion was high,the structure and constituent of polyacrylate core-shell structured particles was controllable,and the particle size reached 295 nm; with the core-shell weight ratio of 85 /15 and the contents of the crosslinking agent for the shell layer and methylacrylic acid were 0. 5% of the total monomer mass,the nylon 6 blend had the highest notch impact strength which was almost six times greater than that of pure PA6.更多还原