Lifetime of alkyl macroradicals in irradiated ultra-high molecular weight polyethylene

被引：26
|
作者：
Brunella, V.
Bracco, P.
Carpentieri, I.
Paganini, M. C.
Zanetti, M.
Costa, L.
机构：
[1] Univ Turin, Dipartimento Chim Inorgan Fis & Mat, I-10125 Turin, Italy
[2] NIS Ctr Excellence, I-10125 Turin, Italy
来源：
POLYMER DEGRADATION AND STABILITY | 2007年 / 92卷 / 08期
关键词：
UHMWPE; electron beam; radicals; EPR;
D O I：
10.1016/j.polymdegradstab.2007.05.005
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The interaction of UHMWPE with an electron beam in vacuum and in the presence of oxygen has been investigated. UHMWPE irradiated to various doses was examined with Electron Paramagnetic Resonance (EPR) and Fourier Transform infra-red (FTIR) spectroscopies. EPR was used to explore the nature of radicals produced in UHMWPE upon irradiation and to follow their decay as a function of time. Hydroperoxides formation and distribution throughout the samples were studied with FTIR spectroscopy. A correlation between the rate of decay of macroradicals and that of hydroperoxide formation has been proposed. Accordingly, the lifetime of secondary alkyl macroradicals in the amorphous phase of the polymer was found to range approximately from 3 to 10 h. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1498 / 1503
页数：6
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