Molecular mobility of a comb-shaped copolymethacrylate with chalcone chromophore-containing side groups |
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Authors: | N A Nikonorova N N Smirnov G I Nosova N A Solovskaya A V Yakimansky |
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Institution: | 1.Institute of Macromolecular Compounds,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | The molecular mobility of copolymethacrylate with chromophore-containing chalcone side chains is studied by broadband dielectric
spectroscopy. Five regions of dipolar polarization relaxation are identified: namely, γ, β, β1, α, and δ processes. It is shown that γ and β1 processes are related to the local mobility of methylene sequences and ester
groups adjoining the backbone, while the α process is associated with the cooperative segmental mobility of the backbone.
The β and δ processes are attributed to the mobility of chalcone groups: the local mobility in the glassy state (reorientation
relative to the long axis of chromophores) and the cooperative mobility in the rubbery state (reorientation relative to the
short axis of chromophores), respectively. The incorporation of 20% chalcone groups does not change the glass-transition temperature
but enhances the cooperativity of the α process and intermolecular interactions. |
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