A study on compatibility of polymer blends of polystyrene/poly(4‐vinylpyridine)

Abstract

Blends of polystyrene/poly (4-vinylpyridine) have been prepared by casting from a common solvent. The compatibility of the blends was studied by using dilute solution viscometry (DSV), differential scanning calorimetery (DSC), Fourier transformation-infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The relative viscosity versus composition plots for the blends are not perfect linear. The corresponding intrinsic viscosity values show negative deviation from ideal behavior when plotted against composition. Also, the modified Krigbaum and Wall interaction parameter, Db, shows small and negative values for all compositions except for the blend PS/P4VP (25 : 75). The results indicate that the polymers are incompatible but small interaction values predict physically miscible blends which eventually show phase separation, as is observed in the present studies. However, the blends as obtained show a single, composition-dependent, glass transition temperature that fits the Fox equation well, indicating the presence of homogeneous phase. The constant, k obtained from Gordon-Taylor equation suggests intermolecular attraction between these polymers. FT-IR and SEM support the results of DSV and DSC.

Silver Particulate Films on Compatible Softened Polymer Composites

“…It is clear that melt mixing at higher temperature gives more compatible blend than room temperature solution mixed blend. Thus, an order of compatibility is achieved in PS/P2VP, 50:50 blend as reported for PS/P4VP blends [35]. Therefore, we can expect formation of discontinuous silver subsurface film on the blend.…”

In vitro evaluation of poly (lactic‐co‐glycolic acid)/polyisoprene fibers for soft tissue engineering

“…By observing glass transition temperature in blends, it is possible to predict the miscibility between the polymers present in such blends. When a complete interaction happens, polymeric chains interpenetrate as if they were in the same structure, therefore generating a single T g dislocation in the thermogram . For partially miscible blends the thermogram present two variations in the curve's base line with visible approximation between glass transition temperatures.…”

Using ultrasound-assisted dispersion and in situ emulsion polymerization to synthesize TiO2/ASA (acrylonitrile-styrene-acrylate) nanocomposites

“…The bands at 1735 and 2238 cm À1 are respectively attributed to the stretching vibration of carbonyl (C]O) [26e28] and cyano (C^N) [29,30]. Moreover, the absorption peaks at 703 and 1602 cm À1 are indicative of single substituted phenyl ring and vibration of benzene skeletal ring, respectively [31]. Note that the broad peak below 700 cm À1 on TiO 2 curve is assigned to TieOeTi bond [32], and it should have been appeared on the TiO 2 /ASA curves.…”