An investigation has been made of the measurement of degree of swelling of vulcanizates and the estimation of υ τ , the volume fraction of polymer in a vulcanizate swollen to equilibrium. Methods have been established for dealing with a volatile swelling liquid, allowing for small percentages of nonpolymer in the vulcanizates, testing for diffusion equilibrium and correcting for swelling increment. The resulting values of υ τ are suitable for use as described in the preceding Part I.
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Ellis et al. (1964) studied this question.