Abstract

During the thermo-reversible ageing process of 10% solutions of polyvinyl chloride in di(2-ethylhexyl)-phthalate (DOP) as well as in Reomol ATM, the small angle X-ray scattering and the storage modulus were measured. The ageing of polyvinyl chloride proceeds in Reomol much faster than in DOP. A clear correlation between the storage modulus and the crystalline structure in the gels during the ageing process is shown. The distance between the crystallites appears to be independent of the degree of ageing, in DOP as well as in Reomol. In both cases this distance is estimated to be ∼300 A ̊ .

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