嵌段型丙烯腈-丁二烯-苯乙烯树脂的制备与性能

Preparation and properties of acrylonitrile-butadiene-styrene resins based on block copolymers

针对丙烯腈-丁二烯-苯乙烯(ABS)树脂中的橡胶粒子相形态难以精确调控的问题,提出采用可逆加成断裂链转移(RAFT)乳液聚合合成苯乙烯-丙烯腈无规共聚物和苯乙烯-丙烯腈/丁二烯嵌段共聚物,并通过共混制备嵌段型ABS树脂,研究嵌段共聚物分子结构对材料相形态和机械性能的影响。结果表明,通过乳液共混可制得橡胶粒子均匀分散的ABS树脂,与市售产品相比,采用两嵌段共聚物为增韧剂的嵌段型ABS树脂具有优异的综合性能,将增韧剂改为三嵌段共聚物,材料的拉伸断裂韧性能进一步提升,但缺口冲击性能下降明显。

Phase morphology of rubber particles in acrylonitrile-butadiene-styrene(ABS) resin is non-precisely controllable. In view of the above problem, styrene-acrylonitrile random copolymers and styrene-acrylonitrile/butadiene block copolymers were synthesized by reversible addition-fragmentation chain transfer(RAFT) emulsion polymerization and ABS resins based on block copolymers were prepared by blending. The influence of the molecular structure of block copolymers on the phase morphology and mechanical properties of materials was investigated. The results showed that ABS resin with uniformly dispersed rubber particles could be obtained by latex blending. Compared with commercial products, ABS resin using diblock copolymer as the toughening resin exhibited excellent comprehensive properties. When the toughening resin was replaced by triblock copolymer, the tensile fracture toughness of ABS resin could be further improved, but its notched impact performance decreased significantly.