Abstract
Miscibility and intermolecular interactions of novel blends of poly(N-vinyl-2-pyrrolidone) (PVP) and acid functional polyester resins (APE) were studied by use of Differential Scanning Calorimetry (DSC), Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), Cross-Polarization Magic Angle Spinning (CPMAS) 13C NMR spectroscopy and 1H NMR relaxometry. The miscibility is found to be correlated to the number of acid end groups (acid value, AV) of APE and the molar mass (M) of PVP. Blends of APE with high AV and PVP with high M exhibit single-phase behavior in DSC and 1H NMR. Both ATR-FTIR and 13C NMR of these blends show composition-dependent displacements of the APE and PVP signals, which confirms that the two polymers are close together in the blend. In particular, FTIR spectra reveal a systematic blue shift of the stretch vibrations of both PVP and APE carbonyl groups. This indicates dipole−dipole interactions between a carbonyl group of PVP and a carbonyl of APE. The spectra contain a broad p...
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