Molecular interactions and structural effects on mixing pentanol in polyethylene glycol diacrylate and polyethylene glycol dimethacrylate

To understand the intermolecular interactions in binary mixtures of pentanol with polyethylene glycol diacrylate and polyethylene glycol dimethacrylate respectively, absolute viscosity and refractive index have been measured over the whole composition range, at 298.15 K, 303.15 K and 313.15 K, under atmospheric pressure. Molar refraction and interaction parameter have been calculated. The experimental data have been used to evaluate deviation in viscosity, deviation in refractive index and excess Gibb's free energy of activation for viscous flow, and the results have been fitted to Redlich-Kister polynomial equation.

► Refractive index and viscosity for pentanol + PEGDMA and pentanol + PEGDA. ► Hetero-molecular association in solutions of pentanol in PEGDA and PEGDMA. ► Thermal energy increases the strength of interaction in the mixtures. ► Stronger specific interaction in the mixture pentanol + PEGDMA than pentanol + PEGDA. ► The various mixing rules and theories used for evaluating the optical dielectric constant.