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Dielectric Behaviour of Some Poly(alkyl methacrylate)s in Dilute Solution

The dielectric properties of dilute solutions of PMMA, PEMA and PIBMA in toluene, carbon tetrachloride and dioxane were investigated in the frequency range of 1—150 MHz at temperatures between −23 and 65°C. A symmetrically shaped absorption curve was observed for each solution. PIBMA exhibits a dielectric behaviour very similar to that of the motion of the main chain. PMMA exhibits a behaviour which can only be interpreted by taking the internal rotation of the side chain into account. PEMA exhibits a behaviour intermediate between PMMA and PIBMA. The dielectric absorption in solution of these polymers can be attributed to the coupled or the cooperative motion of the main chain and the side chain. The dielectric behaviour reflects the magnitude of the two absorptions and manifests a behaviour nearer to that of the larger of the two absorptions.