Abstract
The rate constant of the reaction of ozone with powdered polypropylene and with isotropic or oriented polypropylene films was determined over the temperature interval 300 to 370 K by measuring absorption of ozone. An acceptor of free radicals, (4,4′-dimethoxyphenyl nitroxide), was used to measure the rate of radical formation in polymer samples. The probability that the radical leaves the cage is 2·5-3% in isotropic and 4·5% in oriented polypropylene at 333 K. The results are discussed in terms of anisotropic microdiffusion and extended cage shape in oriented polymers.
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