Abstract
Rate constants of the spin exchange between nitroxide radicals and oxygen in oriented and isotropic samples of polypropylene, high density and low-density polyethylene were measured over the temperature range of 290–373 K by the method of continuous saturation of the EPR spectrum of the spin probe, and used to calculate oxygen permeability. The results agree with literature data for isotropic samples, but are smaller by 1·5 to 2·5 times upon orientation.
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