摘要
采用种子乳液聚合方法制备了聚丁二烯接枝丙烯腈苯乙烯共聚物(PB-g-SAN),将PB-g-SAN共聚物与SAN树脂熔融共混获得丙烯腈丁二烯苯乙烯三元共聚物(ABS),研究了PB-g-SAN共聚物的接枝层厚度对ABS性能的影响。结果表明,接枝层厚度超过临界值117nm,接枝层过厚会导致核壳改性剂粒子变硬,模量过高,从而失去了作为增韧改性剂的作用。接枝层厚度低于临界值32nm,橡胶粒子不能被SAN接枝链完全覆盖,在SAN基体中发生聚集,导致其增韧效果降低。因此,只有改性剂的接枝层厚度介于32nm和117nm这两个临界值之间,才能对基体树脂起到有效的增韧作用。
PB-g-SAN copolymer prepared via seeded emulsion polymerization were melt-blended with SAN resin forming an ABS resin. The shell thickness of PB-g-SAN copolymer was found to be the most important factor for the toughness of ABS resin. When the shell thickness was greater than a critical value of 117 nm, the modulus of these core-shell particles was too high to be flexible, and thus not efficient as rubbery modifiers. On the other hand, when the shell thickness was less than another critical value of 32 nm, the particles was not fully covered by the shell, the particles could not toughen SAN resin efficiency. When the shell thickness of particles was between 32 nm and 117 nm, the toughening of SAN was observed.
出处
《中国塑料》
CAS
CSCD
北大核心
2013年第2期56-59,共4页
China Plastics
