Paper Title:
Changes in Elastic and Viscoelastic Properties of Poly(Methyl methacrylate) by Physical Aging
  Abstract

The influence of physical aging on mechanical properties of glassy polymers was investigated in this paper. After annealing above Tg to release the previous thermal and stress history, the polymethyl methacrylate (PMMA) samples were quenched to 27°C, aged for various times (ta), and were then stretched at the same temperature by two ways: (1) step stresses with four different magnitudes varying from 15MPa to 30MPa; (2) constant rate stretch up to fracture. The physical aging effect was monitored by measuring the initial instantaneous elastic modulus (E) and the fracture strength (σf) from the stress-strain curves as a function of ta up to 1368h. It is shown that both E and σf of the material increase with aging time and approach to their asymptotic values, which satisfy the KWW rule, while the isochronous creep compliance decreases with log ta in a linear manner within the aging time range considered in this paper.

  Info
Periodical
Advanced Materials Research (Volumes 314-316)
Chapter
Mechanical Behavior & Fracture
Edited by
Jian Gao
Pages
914-917
DOI
10.4028/www.scientific.net/AMR.314-316.914
Citation
W. B. Luo, C. H. Wang, X. Liu, Q. Shen, "Changes in Elastic and Viscoelastic Properties of Poly(Methyl methacrylate) by Physical Aging", Advanced Materials Research, Vols. 314-316, pp. 914-917, 2011
Online since
August 2011
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