【摘要】 采用种子乳液聚合技术在聚丁二烯乳胶粒上接枝共聚苯乙烯和丙烯腈 ,通过改变共聚单体和聚丁二烯的投料比合成了一系列PB g SAN共聚物 ,将这些共聚物与SAN树脂进行熔融共混制得了ABS树脂。研究了投料比对SAN在PB上的接枝率、SAN的分子量和ABS树脂的形态结构及性能的影响。结果发现 ,随着投料比的增加 ,SAN在PB上的接枝率及SAN的分子量提高 ,接枝率和SAN分子量共同作用影响着ABS树脂的冲击韧性和加工性能。形态结构研究结果表明 ,投料比不仅影响着橡胶粒子在SAN基体中的分散程度 ,而且影响着橡胶粒子的内部结构 ,随着投料比的增加 ,橡胶粒子在基体中的分散程度提高 ,其内部的包容结构增多并导致了橡胶粒子粒径的增大。更多还原

【Abstract】 A series of PB g SAN copolymers were synthesized by graft copolymering styrene and acrylonitrile comonomer onto polybutadiene(PB)latex rubber particles through varing feed ratio of monomer to PB(M/PB)with seeded emulsion polymerization technique.By blending these copolymers with SAN resins,ABS resin was prepared.The influnce of feed ratio on grafting degree (GD) and M W of SAN copolymer,morphology and property of ABS resins was investigated.It was found that GD and M W of SAN increased with increasing feed ratio of monomer to PB rubber,and both of them affected the impact toughness and processing properties of ABS resins.The morphology results showed that feed ratio affected not only dispersion of PB rubber particles in SAN matrix but also did morphology of rubber particles.The dispersion of the rubber particles in matrix was gradually improved with increasing feed ratio,and an increasing of SAN subinclusions distributed in PB rubber particles with it resulted in an increasing of diameter of PB rubber particles.更多还原