The specific concentration c a of methylene chloride, the zero‐concentration diffusion coefficient D 0 , and the concentration coefficient γ D of the diffusivity in drawn and annealed LDPE were measured. The influence of the drawing rate, of annealing with the ends of the sample free and fixed and the effects of time of standing at room temperature after annealing were investigated. The observed transport properties are in good agreement with the microfibrillar model of fibrous structure, its relaxation during annealing, and the slow crystallization of relaxed tie‐molecules upon standing at room temperature.
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Candia et al. (1980) studied this question.
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