Abstract
Eight fractions of poly(ditrimethylene terephthalate)(PTMTMT) were characterized by viscometry, osmometry and thermal analysis. The four fractions of higher molecular weight fitted a linear variation of the glass transition temperature (Tg) with the inverse of the molecular weight, and the other ones showed a nonlinear behaviour. A value of the parameter b a = 0.84 was obtained when the Somcynsky-Patterson equation was used, showing that PTMTMT is a relatively flexible polymer and slightly more rigid than the preceding member of the series, poly(diethylene terephthalate) (PDET). Moreover, in order to evaluate the dependence of Tg with molecular weight, the Gibbs-DiMarzio equation was applied, using ϵ = 1160 cal mol −1 for reaching the best correlation This value also corresponds to flexible polymers.
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