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Viscoelastic behavior of PMMA in relation to deformation mode

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Abstract

The molecular motions and the behavior in the four characteristic regions of an amorphous poly(methyl methacrylate) (PMMA) were studied using two different attachments of a dynamic mechanical analyzer: tension and bending. Measurements were taken over a wide range of temperatures and frequencies using ramp and step heating programs. A distinct viscoelastic versus temperature behavior was found above and below the glass transition temperature in bending mode. Apparent activation energies for the two relaxations found in PMMA (α and β) using both clamping modes are reported and discussed. Beyond the usual behavior of α- and β-relaxations with increasing frequency, new features are observed: the merging of α- and β-relaxation. Experimental results are explained on the basis of cooperativity concept.

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Acknowledgements

This paper was supported by the Post‐Doctoral Programme POSDRU/159/1.5/S/137516, project co‐funded from European Social Fund through the Human Resources Sectorial Operational Program 2007–2013.

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Authors and Affiliations

  1. “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley 41A, 700487, Iasi, Romania

    Daniela Ionita & Mariana Cristea

  2. Technical University of Cluj Napoca, Memorandumului 28, 400114, Cluj-Napoca, Romania

    Daniela Ionita & Dorel Banabic

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  1. Daniela Ionita
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  2. Mariana Cristea
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Correspondence to Daniela Ionita.

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Ionita, D., Cristea, M. & Banabic, D. Viscoelastic behavior of PMMA in relation to deformation mode. J Therm Anal Calorim 120, 1775–1783 (2015). https://doi.org/10.1007/s10973-015-4558-4

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