ESR study on radical conversions in irradiated low‐density polyethylene

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Abstract
ESR studies were carried out on radical conversions by thermal and photochemical mechanisms in low‐density polyethylene irradiated mainly with electron beams at −196°C both in vacuum and in the presence of CO. According to the spectral change, the following radical conversions were elucidated for the samples irradiated in vacuo [eqs. (1) and (1′)] and in the presence of CO [eqs. (2) and (2′)]. magnified image From the resemblance of the ESR spectrum observed after direct photolysis of polyethylene to that observed after photo‐induced radical conversions of the allylic radicals, it is concluded that an eight‐line ESR spectrum observed immediately after photolysis of polyethylene at −196°C could be attributed more reasonably to the alkyl radicals CH2CHCH3 than to CH2CH2 and CH2CHCH2.

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