Evidence of glass transition in thin films of maleic anhydride derivatives: Effect of the surfactant coadsorption |
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Authors: | D López-Díaz M M Velázqueza |
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Institution: | (1) Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca, E-37008 Salamanca, Spain |
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Abstract: | The glass transition temperature of poly (maleic anhydride-alt-1-octadecen) and poly (styreneco-maleic anhydride) cumene-terminated
thin films has been measured by mechanical relaxation of Langmuir films of these polymers. The dynamical properties show glass-like
features (non-Arrhenius relaxation times and non-Debye mechanical response) interpreted by the coupling model. The glass transition
temperature values determined by a mechanical relaxation experiment (step-compression) agree very well with those obtained
by surface potential measurements. It is found that the glass transition temperature values in thin films decrease by about
100K as compared with those corresponding to the bulk polymers. The coadsorption of the water-insoluble surfactant DODAB decreases
the glass transition temperature. |
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Keywords: | PACS" target="_blank">PACS 68 15 +e Liquid thin films |
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