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Miscibility and Intermolecular Specific Interactions in Blends of Poly(hydroxyether sulfone) and Poly( N ‐vinylpyrrolidone)
Author(s) -
Lü Han,
Zheng Sixun,
Zhang Bing,
Tang Xiaozhen
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200300164
Subject(s) - miscibility , glass transition , materials science , hydrogen bond , polymer chemistry , sulfonyl , n vinylpyrrolidone , differential scanning calorimetry , polymer blend , fourier transform infrared spectroscopy , intermolecular force , composite material , polymer , thermodynamics , chemical engineering , chemistry , alkyl , copolymer , molecule , organic chemistry , physics , engineering
Summary: The blends of poly(hydroxyether sulfone) (PHES) with poly( N ‐vinylpyrrolidone) (PVPy) were investigated by means of differential scanning calorimetry (DSC) and FTIR spectroscopy. The miscibility of the blend system was established on the basis of the thermal analysis results. DSC showed that the PHES/PVPy blends prepared by casting from N , N ‐dimethylformamide (DMF) possessed single, composition‐dependent glass transition temperatures, indicating that the blends are miscible in the entire composition. The experimental glass transition temperatures have higher values than those calculated on the basis of additive behavior; the variation of the glass transition temperatures of the blends was accounted for by the Kwei equation. FTIR studies indicate that competitive hydrogen bonding interactions exist upon addition of PVPy to the system, which were involved in the self‐ and cross‐association, i.e., OH···OS, OH···OH of PHES and OH···OC< of PVPy. The FTIR spectra in the range of the sulfonyl stretching vibrations showed that the hydroxyl‐associated sulfonyl groups are partially “set free” upon addition of PVPy to the system. The IR spectroscopic investigation of both the model compounds and the PHES/PVPy blends suggests that the strength of the hydrogen bonding interactions in the blend system increases in the following order: OH···OS, OH···OH and OH···OC<.Plot of glass transition temperature for PHES/PVPy blends as a function of weight fraction of PVPy. The prediction of the Kwei equation yields the values of k = 1 and q = 122.