EPR investigation on radiation-induced graft copolymerization of styrene onto polyethylene: Energy transfer effects |
| |
| Affiliation: | 1. Dipartimento di Chimica Generale, Universita’ di Pavia, 27100 Pavia, Italy;2. Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Italy;1. Hungarian Academy of Sciences, Institute of Isotopes, Budapest, Hungary;2. Hungarian Academy of Sciences, Institute of Isotopes, Budapest, Hungary;1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Nuclear Science and Technology, University of South China, Hengyang 421001, China;4. CNNC Nuclear Power Operations Management Co., Ltd., Haiyan 314300, China;1. Horia Hulubei National Institute for Physics and Nuclear Engineering, Association Euratom—MEdC, 077125 Bucharest, Romania;2. Institute of Chemical Physics, University of Latvia, Association Euratom—AEUL, Rīga, Latvia;3. VTT Technical Research Centre of Finland, Association Euratom—Tekes, Espoo, Finland;4. Institute of Physics, University of Tartu, Tartu Estonia;1. Department of Fundamental Chemistry, Federal University of Pernambuco (UFPE), Recife 50670-901, PE, Brazil;2. School of Science and Technology, Federal University of Rio Grande do Norte (UFRN), Natal 59078–970, RN, Brazil;3. Department of Chemistry and Technology of Functional Materials, Chemical Faculty, Gdansk University of Technology (GUT), G. Narutowicza 11/12, 80-233 Gdansk, Poland;1. Ochanomizu University, 2-1-1 Otsuka Bunkyo-ku, Tokyo 112-8610, Japan;2. KAKEN Co. LTD., 1044 Hori Mito, Ibaraki 310-0903, Japan;1. Laboratory of Biotransformation, Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, 142 20 Prague 4, Czech Republic;2. Université d’Aix-Marseille, CNRS, iSm2 UMR 7313, Avenue Escadrille Normandie Niemen, 13397 Marseille, France |
| |
| Abstract: | In this paper, energy transfer phenomena concerning the in-source graft copolymerization of styrene onto LDPE were investigated through the EPR analysis of the radical intermediates. The model solution experiments have shown a substantial deviation of the experimental G (radicals) values with respect to the additivity law, which reflect the negative effect of the styrene monomer concentration on the initiation rate of the graft copolymerization.The EPR measurements performed on polyethylene-co-styrene graft copolymers of various composition following low-temperature vacuum gamma irradiation have confirmed the decrease of the total radical yields with increasing the styrene concentration. The effect was partly attributed to the heterogeneity of the graft copolymer matrix and to the lack of molecular mobility in the solid state at low temperature, which prevents the attainment of the favourable geometrical configurations in intermolecular energy and charge transfer events. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
