PP/EPDM/纳米弹性体粒子三元共混体系的脆韧转变

研究了PP／EPDM／纳米弹性体粒子(ENP)三元共混体系的脆韧转变行为。结果表明，与PP／EPDM二元共混物相比，三元共混物的脆韧转变可以在EPDM质量分数较低的情况下发生；在橡胶总质量分数相同的情况下，三元共混物有更高的冲击强度，拉伸强度有一定提高。从脆断样条的扫描电镜照片观察到，在相同EPDM质量分数下，PP／EPDM／ENP三元共混物中的EPDM粒子明显细化，分布均一，粒子间距减小，这是脆韧转变提前的原因。

Brittle-ductile Transition of PP/EPDM/Elastiomeric Nano-meter Particle (ENP) Ternary Blends

The brittle-ductile transition of PP/EPDM/Elastomeric nano-meter particle (ENP) was studied. Compared to PP/EPDM binary blends, the brittle-ductile transition of PP/EPDM/ENP ternary blends occurred at lower EPDM content. The impact strength of ternary blends was higher than that of binary blends as the total rubber content was the same and the tensile strength increased to a certaim extent. The process from brittle to ductile of the impact fracture surface was observed by means of SEM. When EPDM content was the same, PP/EPDM/ENP ternary blends had smaller particle size, better dispersion and a smaller interparticle distance in contrary to PP/EPDM binary blends, which promoted the brittle-ductile transition.