DSC studies on polytetrahydrofurans with various molecular masses, their blends and their cured samples

DSC studies are given for polytetrahydrofurans with molecular masses equal to 650, 1400, and 2900, for their blends, and for their cured samples. The samples were stored, annealed, and quenched to obtain the samples with diff erent thermal histories. Two or more endothermic peaks appear in the DSC curves for the stored sampl es, even for the non-blended samples. A hyperbolic curve forced the plot of the highest melting temperature vs. the molecular mass to asymptote to abo ut 50 degreesC. The relationship between the highest melting temperature an d the composition for the blended samples is suitable to linear or Fox's re lation. A peak and a shoulder appear in the DSC curves of the cured samples . As the samples are cooled at the faster rates in the thermal treatment, t he shoulder appears at the lower temperatures.