Abstract
The effect of the chemical modification of poly(propylene glycol) (PPG) end groups on the molecular dynamics under 2D confinement and the polymer/matrix interactions (including interfacial energies) was investigated by a combination of differential scanning calorimetry (DSC), broadband dielectric spectroscopy (BDS), surface tension and contact angle measurements. The replacement of −OH groups in native PPG allowed to modify the interactions with the hydroxyl groups attached to the pore walls of nanoporous aluminum oxide (AAO) membranes of various pore diameter. It was found that the observed reduction in the glass transition temperature (Tg) of the core polymers correlates well with a general trend (the higher the solid–liquid interfacial tension, γSL, the lower Tg,confined) reported earlier. Moreover, we demonstrated that although the interfacial solid–liquid energy seems to be almost the same for each studied herein material, a clear change in the crossover temperature (Tc), related to the vitrification...
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