Effect of the surface polarity, through employing nonpolar spacer groups, on the glass-transition dynamics of poly(phenyl methylsiloxane) confined in alumina nanopores
| Autor: | Roksana Winkler, Karolina Adrjanowicz, Lukasz Laskowski, Wenkang Tu, Mateusz Dulski |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Surface (mathematics)
Materials science genetic structures Polymers and Plastics Polarity (physics) Polymers Organic Chemistry Dynamics (mechanics) Oxides Insulators Surface conditions Inorganic Chemistry Nanopore Nanopores Differential scanning calorimetry Chemical physics Materials Chemistry sense organs skin and connective tissue diseases Glass transition Functionalization Surface Polarity Broadband dielectric spectroscopy |
| Popis: | Broadband dielectric spectroscopy and differential scanning calorimetry were used to study the effect of changes in the surface conditions on the segmental dynamics of poly(phenylmethylsiloxane) confined in alumina nanopores. Functionalization was done using highly polar propyl phosphoric units separated by the assumed concentration of triethoxysilane groups (from N = 0 to N = 24). By adjusting the proportion between polar units and nonpolar spacers, it was possible to control the surface polarity. Modification of the surface conditions does not inhibit the formation of the adsorbed layer, as revealed by the presence of two Tg’s in calorimetric results. However, changes in the surface polarity will prevent the growth of the additional interlayer in between the core volume and the interfacial layer. Finally, we also found that the changes in the surface polarity affect the equilibration kinetics and can be used to control the time scale of the structural recovery toward the equilibrium state. |
| Databáze: | OpenAIRE |
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