Blends of phenolics with poly(ε-caprolactone) (PCL) were prepared by solution casting from the tetrahydrofuran (THF) solution. Differential scanning calorimetry (DSC) and Fourier-Transform infrared spectroscopy (FTIR) were used to examine the miscibility behavior and hydrogen bonding of the blend. This phenolics/PCL blend system is fully miscible based on single glass transition temperature due to the formation of inter hydrogen bonding between hydroxyl of phenolic and carbonyl of PCL. In addition, a negative polymer-polymer interaction energy density “B” was obtained based on the melting depression of PCL using the Nishi-Wang equation. Furthermore, FTIR was used to study the hydrogen-bonding interaction between the phenolic hydroxyl group and the PCL carbonyl group at various temperatures and compositions. Moreover, the inter-association equilibrium constant and its related enthalpy of phenolic/PCL blends were determined and used to predict the miscibility window, free energy and fraction of the hydrogen bonding according to the Painter-Coleman association model (PCAM).
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Kuo et al. (2001) studied this question.
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