Damage Studies of Brittle-Ductile Transition in PP EPDM Blends  

作　　者：李强 郑文革 漆宗能 吴选征 

机构地区：[1]State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, Beijing 100080, PRC [2]Department of Applied Physics, Hong Kong Polytechnic, Hong Kong

出　　处：《Science China Chemistry》1993年第11期1300-1306,共7页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China.

摘　　要：Damage zones of brittle-ductile (B-D) transition in PP/EPDM blends are studied in this paper. The contribution of crazing and shear yielding zones in damage zones to energy dissipation of blends was measured with computer image analysis (CIA) and the transition of shear yielding zone (A_(sh)) with rubber volume fraction (V_f) was also manipulated. Results showed that the B-D transition of impact strength of blends corresponded to the fracture mechanism in PP/EPDM blends, from matrix crazing to matrix shear yielding. In addition, two new parameters, density of energy dissipation for crazing zone (F_(cz)) and for shear yielding zone (F_(sh)), are first obtained in this paper. The value of F_(sh) is about four times larger than that of F_(cz) for PP/EPDM blends, which confirmed that the matrix shear yielding is a more effective way of energy dissipation in blends.Damage zones of brittle-ductile （B-D） transition in PP/EPDM blends are studied in this paper. The contribution of crazing and shear yielding zones in damage zones to energy dissipation of blends was measured with computer image analysis （CIA） and the transition of shear yielding zone (A_sh) with rubber volume fraction （V_f） was also manipulated. Results showed that the B-D transition of impact strength of blends corresponded to the fracture mechanism in PP/EPDM blends, from matrix crazing to matrix shear yielding. In addition, two new parameters, density of energy dissipation for crazing zone (F_cz) and for shear yielding zone (F_sh), are first obtained in this paper. The value of F_sh is about four times larger than that of F_cz for PP/EPDM blends, which confirmed that the matrix shear yielding is a more effective way of energy dissipation in blends.

关 键 词：brittle-ductile transition damage studies pereolation model density of energy dissipation for crazing zone(F_(cz)) density of energy dissipation for shear yielding zone(F_(sb)). 

分 类 号：O6[理学—化学]