THERMOANALYTICAL AND SPECTROSCOPIC STUDY OF POLY(VINYL PYRROLIDONE) POLY(STYRENE-CO-VINYL PHENOL) BLENDS

In the present study a series of poly(vinyl pyrrolidone) (PVP) blends with a series of styrene-vinyl phenol copolymers (SVP) have been prepa red and studied. Copolymers with a vinyl phenol content greater than 4 mol% show complete miscibility with PVP over the whole blend composit ion range. Copolymers containing more than 25 mol% vinyl phenol form c omplexes with PVP, which precipitate in solution with a common solvent . The miscibility was verified both by visual inspection of the blends and by differential scanning calorimetry measurements, which showed a single glass transition temperature (T-g) throughout the whole compos ition range. Unusually large positive deviations from linearity were o bserved in the T-g versus composition diagrams of some blends. The ext ensive hydrogen bonding interactions between the mixed polymers were s tudied by FTi.r. spectroscopy. (C) 1998 Elsevier Science Ltd. All righ ts reserved.