Abstract
Multiple transitions have been identified by inverse gas-chromatography for fractions of poly(ethylene terephthalate) with M n between 1.47 and 2.69 × 10 4. Depending on the thermal treatment, at least two liquid-liquid transitions T ll (1) and T ll (2) have been observed in addition to T g and T m ; this feature is generally considered as characteristic of semi-crystalline polymers. The similarity of the dependence of T g and T ll on the molecular weight of the polymer probes suggests a common molecular origin of these phenomena; the fact that T ll > T g indicates that the T ll transitions involve longer chain segments. The melting temperature decreases with increasing molecular weight, suggesting again that the crystallinity and/or the size distribution will enlarge as the molecular weight of the polymer is made higher.
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