Rheology pp 223-228 | Cite as

The Influence of Cooling Rate on the Transition to Marked Nonlinear Viscoelasticity in Poly(Methylmethacrylate)

  • Mats E. Robertsson
  • Jan-Fredrik Jansson


For amorphous glassy polymers a transition exists from approximately linear to marked nonlinear behaviour. The transition has been suggested to be due to stress activated changes in the deformation mechanisms1,2,3. In poly(methylmethacrylate),(PMMA), as well as in other polymers both the α- and β-mechanisms have been shown to be essential for the appearance of the nonlinearity1,2. The transition is accompanied by an accelerated stress dilatation and is supposed to be influenced by the available free volume in the material4.


Cool Rate Free Volume Density Column Linear Viscoelasticity Transversal Strain 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Mats E. Robertsson
    • 1
  • Jan-Fredrik Jansson
    • 1
  1. 1.Dept. of Polymer TechnologyThe Royal Institute of TechnologyStockholmSweden

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