Blends of poly (hydroxy ether of Bisphenol A) (Phenoxy, PH) with poly(e-caprolactone) (PCL) were prepared by the casting method. The glass transition temperatures, the isothermal crystallization process from the melt, and the melting temperature of PCL were studied by differential scanning calorimetry (DSC). The blends exhibit a single composition-dependent glass transition temperature, characteristic of miscible systems. Blend interaction parameters, obtained from analysis of the melting point depression, observed by optical microscopy and DSC, were -2.42 and -2.16 cal/cm3, respectively. Analysis of the isothermal crystallization curves by means of the Avrami equation leads to ~3, almost independent of composition and crystallization temperature. The analysis of kinetic data according to nucleation theory indicates that crystallization of PCL in the explored temperature range takes place in regime II, while the blends show a regime II-III transition.
The miscibility behavior and the specific interactions of binary blends of polyethylene oxide) (PEO) and poly(vinyl methyl ether) (PVME) with poly(p-vinylphenol) (PVPh) are investigated by means of differential scanning calorimetry, analogue calorimetry, and Fourier transform infrared (FTIR) spectroscopy. The compositional variation of the glass transition temperature (Tg) of PEO/PVPh and PVME/PVPh blends is analyzed in terms of the Kovacs free volume theory. This theoretical approach is able to reproduce the glass transition behavior of both systems quite well, although excess volume measurements of PVME/PVPh blends do not support the physical meaning assigned to the parameters in the theory. The presence of specific interactions between the PVPh and the polyethers is indicated by the large and exothermic interaction energy density obtained both from heat of mixing data using model compounds and from melting point depression data of PEO/PVPh blends. The specific nature and the average strength of the intermolecular interaction for the polymer blends and the analogue mixtures are determined by means of FTIR measurements.
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