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Free-radical decay in a polymer blend PMMA/PEO studied by the EPR method

✍ Scribed by K. Miklešová; F. Szöcs

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
154 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

The EPR method was used for studying decay of free radicals in a blend of poly(methyl methacrylate) (PMMA) with poly(ethylene oxide) (PEO). The influence of the composition of the blend (up to 70 vol% PEO) and of the time of mixing on the transfer of a radical centre was determined. The time of mixing for a blend affects molecular motions as a result of specific interactions between dissimilar PMMA and PEO chains. These molecular motions control the transfer of the radical centre so that free radicals decay more rapidly in the blend mixed for 6 min than in that mixed for 12 rain. A slower decrease in the concentration of free radicals in a sample of a PMMA/PEO blend containing 50 vol% PEO compared with samples with 10, 30 and 70 vol% is also observed.

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