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Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences | Vol.224, Issue.1156 | | Pages 120-128

Molecular-Weight Changes in the Degradation of Long-Chain Polymers

A. Charlesby

Abstract

The changes in molecular weight of a long-chain polymer (initially of arbitrary molecular-weight distribution) are studied when the main chain is subjected to random fracture, such as occurs when certain polymers are exposed to high-energy radiation. For several distributions studied, all trace of the initial distribution curve is lost after an average of some 3 to 8 main-chain fractures per molecule. For lower degrees of degradation the shape of the curve of weight average against degradation can provide information as to the initial weight average, z average, z+1 average molecular weights. The initial number-average can be obtained by a method of extrapolation.

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Molecular-Weight Changes in the Degradation of Long-Chain Polymers

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Keywords

weight average z average z1 average molecular weights highenergy numberaverage extrapolation molecular weight molecularweight distribution longchain polymer random fracture

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A. Charlesby,.Molecular-Weight Changes in the Degradation of Long-Chain Polymers. 224 (1156),120-128.

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