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The molecular weight distribution of polyethylene produced by radiation was calculated according to a kinetic scheme. The calculated molecular weight distribution was compared with the results deduced from gel‐permeation chromatography. The observed distribution curve from GPC was broader and showed a lower degree of polymerization than the calculated one. Discrepancies between observed and calculated curves can be explained if the polymer contains nonsteady‐state products and if the reaction mechanism includes chain transfer to dead polymer. By this reaction long‐chain branching would occur. Several long‐chain branches per polymer molecule were indeed found, as inferred from solution properties.
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Yamaguchi et al. (1973) studied this question.
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