Abstract
The relaxation properties of cast poly(methyl methacrylate) (PMMA) films have been studed by dielectric spectroscopy. Conventional PMMA was disolved in various solvents (chloroform, toluene, tetrahydrofuran and acetone) and the solutions obtained were cast on a substrate. The influence of the nature of the solvent on the relaxation temperatures of PMMA solid films was studied by dielectric spectroscopy. The variation of the loss factor, tan δ, with temperature was analysed. The results show that the tan δ peak corresponding to the α transition is shifted towards lower temperatures, compared with that of the bulk polymer. The temperature of the β relaxation is decreased for chloroform and increased for the other solvents. Explanations based on acid-base interactions between PMMA and trapped solvent molecules are proposed to understand the influence of the solvent.
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