CAS OpenIR  > 中科院上海原子核所2003年前
Positronium formation in PE/EVA polymer blends at low temperatures
Wang, CL; Kobayashi, Y; Zheng, W; Zhang, C
2001
Source PublicationPOLYMER
ISSN0032-3861
Volume42Issue:6Pages:2359
AbstractPositronium (Ps) formation in a polymer blend system consisting of polar and non-polar components has been investigated. We measured positron lifetime spectra for a series of polymer blends between polyethylene (PE) and ethylene-vinyl acetate (EVA) as functions of temperature (T = 100-300 K) and composition (EVA weight content Phi = 0-100%) as well as measurement time (t = 0-100 h) at T = 100 and 250 K. The glass transition temperatures for blends, around 227 K as determined by the ortho-positronium (o-Ps) lifetime tau (3) versus temperature, were invariant, within the experimental error, as a function of EVA concentration. Large variations of the o-Ps formation probability I-3 versus temperature and time, observed for pure LDPE and blends with relatively low concentrations of EVA, were interpreted on the basis of the spur reaction model of Ps formation, with reference to the effects of localized electrons and trapping centers produced by positron irradiation. In the blends with higher EVA concentrations, the effects of positron irradiation were appreciably weakened, as the result of positron trapping on the polar acetate group of EVA. (C) 2000 Elsevier Science Ltd. All rights reserved.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000165934200009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/10106
Collection中科院上海原子核所2003年前
Recommended Citation
GB/T 7714
Wang, CL,Kobayashi, Y,Zheng, W,et al. Positronium formation in PE/EVA polymer blends at low temperatures[J]. POLYMER,2001,42(6):2359.
APA Wang, CL,Kobayashi, Y,Zheng, W,&Zhang, C.(2001).Positronium formation in PE/EVA polymer blends at low temperatures.POLYMER,42(6),2359.
MLA Wang, CL,et al."Positronium formation in PE/EVA polymer blends at low temperatures".POLYMER 42.6(2001):2359.
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