Abstract
The miscibility and specific intermolecular interactions in the blends of poly(hydroxyether ketone) (PHEK) and poly(4-vinylpyridine) (P4VP) were investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. The PHEK/P4VP blends displayed single, composition-dependent glass transition temperatures (Tg ’s), indicating that the blends are miscible in the amorphous state. The miscibility was further confirmed by the equilibrium melting point depression of PHEK in the blends. The FTIR spectroscopy indicates that there were intermolecular specific interactions between PHEK and P4VP, involving intermolecular (and/or intramolecular) hydrogen bonding interactions including ‒OHO˭C< and ‒OH‒OH of PHEK, and ‒OH of PHEK vs. pyridine rings of P4VP. The strength of these interactions was examined in terms of the determinations of several equilibrium constants according to the Coleman and Painter model. It indicated that the strength of the hydrogen bonding interactions was in the order from weak to strong: ‒OHO˭C< and ‒OH…‒OH of PHEK and ‒OH of PHEK vs. pyridine rings.
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