PP/EPDM-g-GMA共混物的形态结构和力学性能

在转矩流变仪中通过熔融接枝反应制备了EPDM-g-GMA，将其与聚丙烯(PP)在双螺杆挤出机中熔融共混，用化学滴定法测定EPDM—g—GMA的接枝率，用红外光谱对接枝物进行表征，用SEM观察共混物的形态，通过对PP／EPDM-g-GMA共混物的形态结构和力学性能的研究发现，随着EPDM—g—GMA的含量或温度的增加，PP／EPDM-g-GMA共混物的缺口冲击强度相应提高，而拉伸强度降低，断裂伸长率相应增加。

Morphology and mechanical properties of PP toughened by EPDM-g-GMA

A copolymer EPDM-g-GMA was prepared by grafting glycidyl methacrylate(GMA) onto EPDM in a torsion rheometer, then the EPDM-g-GMA obtained was blended with PP in a double screw extruder. The grafting rate of EPDM-g-GMA copolymer was determined by turn over titration measure, while the grafted EPDM-g-GMA copolymer was characterized by FTIR measurements. The morphology and mechanical properties of PP blended with EPDM-g-GMA was studied. It is found that with the increase of the EPDM-g-GMA content or the increase of temperature, the izod notch impact strength became higher, however, the tensile strength became lower. The results show that there is a correlation between the brittle-ductile transition temperature and the elongation at breakage of the PP/EPDM-g-GMA blend with the EPDM-g-GMA content.