J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-261 - C4-264
4th International Workshop on Positron and Positronium Chemistry

J. Phys. IV France 03 (1993) C4-261-C4-264

DOI: 10.1051/jp4:1993440

Interfacial interaction in PP/EPDM polymer blend studied by positron annihilation

C.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