Modelling structural recovery in amorphous polymers

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Constitutive equations are derived for linear viscoelastic response and enthalpy relaxation in amorphous polymers in the vicinity of the glass transition temperature. According to the concept of cooperative relaxation, a glassy polymer is treated as an ensemble of weakly-connected relaxing regions. Mechanical relaxation in a region occurs when the thermally activated flow unit reaches some liquid-like state. Structural recovery is modeled as a sequence of hops in which rearranging regions change their traps. A constitutive model for the linear viscoelastic behavior and enthalpy relaxation in a glassy polymer is validated using experimental data in mechanical and calorimetric tests on polycarbonate and poly(methyl methacrylate). Fair agreement is demonstrated between observations and results of numerical simulation. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)79-95
Number of pages17
JournalMathematical and Computer Modelling
Issue number8-9
StatePublished - 1 Apr 2000
Externally publishedYes


  • Cooperative relaxation
  • Enthalpy recovery
  • Glassy polymers
  • Linear viscoelasticity
  • Physical aging

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications


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