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Diffusion controlled radiochemical oxidation of low density polyethylene—II. Kinetic modelling

Identifieur interne : 006B20 ( Main/Exploration ); précédent : 006B19; suivant : 006B21

Diffusion controlled radiochemical oxidation of low density polyethylene—II. Kinetic modelling

Auteurs : Gerard Papet [France] ; Ludmila Audouin-Jirackova [France] ; Jacques Verdu [France]

Source :

Abstract

Various low density polyethylene (LdPE) multilayer samples were irradiated by 60Co-γ-rays at ambient temperature. The thickness distribution of carbonyl groups concentration, determined by i.r. spectrophotometry, displays a sharp inflexion zone at an invariant depth for a given dose rate. This depth is a decreasing function of the dose rate.Experiments on thin films at various oxygen pressure are made in order to determine the rate constants for the non-diffusion controlled oxidation process. Then a kinetic model is proposed. It leads to a reciprocal dependance of the thickness of the oxidized layer on the square root of the dose rate. The experimental results agree with this model despite an unexplained superficial sharp decrease of the oxidation rate.


Url:
DOI: 10.1016/1359-0197(89)90028-3


Affiliations:


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