J. Phys. IV France 03 (1993) C4-261-C4-264
Interfacial interaction in PP/EPDM polymer blend studied by positron annihilationC.L. WANG1, S.J. WANG1, W.G. ZHENG2 and Z.N. QI2
1 Department of Physics, Wuhan University, Wuhan 430072, China
2 Institute of Chemistry, Academia Sinica, Beijing 100080, China
Positron lifetimes in polypropylene/ethylene-propylene-diene monomer blend (PP/EPDM, EPDM volume content = 40%), pure PP and EPDM have been measured in the temperature range of 95-370K. We observed the \Upsilon - and glass transitions in all samples and the transition temperatures T\Upsilon and Tg are determined. The blend has two lower TgS compared with pure EPDM and PP. At room temperature, the measured freevolume concentration in blend versus EPDM volume fraction Φv is smaller than that calculated by the simple mixing . The different free-volume properties and TgS between blend, PP and EPDM indicate the existence of interfacial interaction between PP and EPDM phases in blend.
© EDP Sciences 1993