ABS树脂的冲击韧性极限及形变机理的研究

将苯乙烯-丙烯腈共聚物接枝聚丁二烯（PB-g-SAN）与苯乙烯-丙烯腈共聚物（SAN）树脂按照一定比例熔融共混制备具有不同橡胶含量的丙烯腈-丁二烯-苯乙烯共聚物（ABS）树脂。研究了不同橡胶含量对ABS树脂的冲击以及拉伸行为的影响，并通过透射电子显微镜研究了ABS树脂的微观形态及形变机理。结果表明，ABS材料的冲击强度随着橡胶含量的增加先升高后降低；断裂伸长率随着橡胶含量的增大而增大；当橡胶含量较少时，橡胶粒子在基体相中发生聚集现象的可能性较小，分散性较好；随着橡胶含量的增加发生聚集现象的可能性增加，粒子分散性变差；随着橡胶粒子含量的增加，ABS树脂的主要增韧机理是由空洞化到银纹再到剪切屈服的转变。

Ultimate Impact Toughness and Deformation Mechanism for ABS Resin

A series of acrylonitrile-butadiene-styrene copolymers (ABS) were prepared by melt blending PB-g-SAN with styrene-co-acrylonitrile (SAN). The effect of rubber content on the impact and tensile properties of ABS was investigated. The dispersion morphology and deformation mechanism were studied by transmission electron microscope (TEM). It was found that the impact strength increased firstly and then decreased with increasing rubber content. The elongation at break increased with the increasing rubber content. A uniform dispersion of rubbery particle in the matrix could be observed when the rubber content was lower. However, at higher rubber contents, the dispersion morphology became poorer and the agglomeration of rubber particles occurred. The main deformation mechanism of the ABS resin was changed from cavitations to the craze and then shears yielding, with increasing rubber content.