Abstract
Differential scanning calorimeteric (DSC) heating thermograms of amorphous poly(N-vinyl pyrollidone) (PVP) blends with short-chain poly(ethylene glycol) (PEG) feature exotherms of cold crystallization coupled with symmetric melting endotherms, which relate to the state of the crystalline component, PEG, while PVP–PEG hydrogen-bonded complex reveals itself as an amorphous phase. As PEG content in blends exceeds a characteristic level, PEG cold crystallization occurs upon heating of the cool-quenched samples through their glass transition temperatures (Tg). The contributions of both thermodynamic and kinetic factors to the occurrence of non-crystallizable PEG have been analysed by considering the dependence of the PEG cold crystallization temperature, Tc, on blend Tg and composition along with the compositional dependence of the heat of melting of PEG. The stoichiometry of the PVP–PEG H-complex was evaluated from DSC thermograms as the amount of non-crystallizable PEG in PVP-underloaded blends.
Published Version
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