کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189510 | 1381186 | 2006 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
EPR studies of peroxide decomposition, radical formation and reactions relevant to cross-linking and grafting in polyolefins
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
EPR spectroscopy has been employed to detect directly radicals formed from a variety of polyolefins (PE, PP and EPM) during reaction with peroxide-derived alkoxyl radicals generated by thermolysis. Conditions have been chosen to reflect those employed in polyolefin grafting, degradation and cross-linking. Radical assignment is assisted, in particular, by the recognition of the effects of chirality on the β-proton hyperfine splittings. Quantitative analysis provides information on the selectivity of the initial attack (e.g. methine protons>methylene protons for PP); notable differences in selectivity between alternating EPM and other EPM samples are discussed. The detection of longer-lived allyl radicals detected for PE is explained in terms of alkyl radical disproportionation with subsequent reaction of the product alkene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 13, 14 June 2006, Pages 4683-4693
Journal: Polymer - Volume 47, Issue 13, 14 June 2006, Pages 4683-4693
نویسندگان
Susana Camara, Bruce C. Gilbert, Robert J. Meier, Martin van Duin, Adrian C. Whitwood,