Journal of Materials Science

, Volume 29, Issue 22, pp 6041–6046 | Cite as

Fracture mechanisms of poly(methyl methacrylate) under static torsion in alcohol environments

  • M. Kawagoe
  • M. Morita


Static torsion tests of poly(methyl methacrylate) were conducted in several alcohol environments at room temperature. The critical torsional stress for crazing and/or cracking increased with increasing molar volume of alcohol, and was not correlated with the solubility parameter, nor with equilibrium solubility as reported in previous results on n-alkanes. Crazing stresses in alcohols were generally lower than those in alkanes. According to Fourier transform-infrared microscopy of the surface scratch made in several environments, both in ethanol and in 1 -butanol, some absorptions were detected at 3450–3650 cm−1, probably due to the hydroxyl group of these alcohols caught by hydrogen bonding to oxygen of the carbonyl group in the side chain, whereas in other environments (1 -octanol, n-hexane, and air) there were no absorptions in this region of wave number. These results suggest that at a flaw tip strained under stress, penetrating alcohol molecules are chemically adsorbed in a cluster, which breaks a weak bond (e.g. dipole interaction) between the polymer chains and, as a result, facilitates craze formation and breakdown leading to brittle fracture.


Carbonyl Alkane Butanol Molar Volume Brittle Fracture 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • M. Kawagoe
    • 1
  • M. Morita
    • 1
  1. 1.Department of Mechanical Systems Engineering, Faculty of EngineeringToyama Prefectural UniversityToyamaJapan

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