Free Radicals in Plastic Food Containers
Keywords:
free radicals, EPR, polymer, γ irradiation.Abstract
Free radicals in polymers are produced during synthesis and interaction with catalysts, initiator of chemical reactions, fillers, stabilizers, and other substances which as chemically or physically active remain dissolved in condensed phase of final product. Also γ irradiation causes both immediate and time dependent changes which arise from the presence of long living free radicals. The free radicals can decay only via a convenient transport mechanism. The decay of free radicals can proceed only if two radical centers approach each other within an appropriate distance. Different preparations of polymers as: filler admixture, γ irradiation, annealing and ageing are discussed in term of free radical production, presence, transformation and decay.
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