橡胶粒子尺寸对ABS树脂性能的影响

Effects of Rubber Particle Size on ABS Resin Properties

通过乳液聚合制备了橡胶粒子尺寸为64—420nm的丙烯腈一丁二烯一苯乙烯（ABS）共聚物。然后将其与SAN—T树脂熔融共混制备橡胶质量分数为15％的ABS树脂。研究了橡胶粒子尺寸对ABS树脂力学性能影响和材料内部形态结构。结果表明：随着橡胶粒子尺寸的增加ABS树脂的冲击韧性提高。当橡胶粒子尺寸在320nm时，拉伸强度达到最大，ABS树脂的综合性能达到最好。粒子尺寸在64～110nm时，橡胶粒子在基体内部发生团聚，材料发生脆性断裂。当橡胶粒子尺寸在216～420nm时，材料主要以韧性断裂为主，发生脆韧转变。具有双峰分布ABS-110nm／ABS-275nm共混物大、小橡胶粒子问发生明显的协同作用。

A series of ABS copolymers with different particle size ranging from 64 nm to 420 nm were prepared via emulsion polymerization. Then ABS resins of 15% rubber content were prepared by melt blending the ABS copolymers with SAN-T resin. Effects of rubber particle size on mechanical properties and morphology of ABS resins were studied. It was found that the impact strength increased with the rubber particle size increasing. When tbe rubber particle size was 320 nm, the tensile strength was the largest and the comprehensive properties of ABS material were best. ＂Agglomeration＂ was found when the particle size ranged from 64 nm to 110 nm and the materials fractured in a brittle mode. However, a brittle-ductile transition was found with increasing rubber particle sizes. The ABS resins fractured in a ductile mode when the particle size ranged from 216 nm to 420 nm. Moreover, synergetic effect was found in the bimodal distribution ABS-110 nm/ ABS-275 nm blends of different rubber particle size.