Journal of Materials Science

, Volume 31, Issue 17, pp 4553–4557 | Cite as

High ductility in poly(methyl methacrylate) induced by absorption and desorption of an acetonitrile aqueous solution

  • M. Kawagoe
  • J. Qiu
  • M. Morita
  • S. Nunomoto


Tension tests were conducted in air at room temperature on PMMA sheet specimens which had been previously soaked in a 40 vol % acetonitrile aqueous solution at 20 °C for 24 h and then dried in air at room temperature for 480 h. In contrast with an untreated specimen which fractured at a stress of 84 MPa and a strain of 9 %, shear yielding clearly took place at 42 MPa and the elongational fracture strain increased to about 148 %. No crazes were observed on the specimen surface and as a result the transparency of the PMMA was thoroughly maintained until fracture. Thus this soaking treatment may change PMMA to a completely ductile polymer without a crazing mechanism. The results of the dynamic viscoelastic measurements at 1 Hz show that the glass transition temperature was lowered to about 80 °C (as compared to about 110 °C), and the β relaxation became much sharper with a higher peak value of 20 °C (as compared to a broad curve with a peak at 50 °C). This clear β relaxation at room temperature may contribute to shear yielding and large plastic elongation of the treated PMMA.


Ductility PMMA Methacrylate Glass Transition Temperature Methyl Methacrylate 
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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • M. Kawagoe
    • 1
  • J. Qiu
    • 1
  • M. Morita
    • 1
  • S. Nunomoto
    • 2
  1. 1.Department of Mechanical Systems Engineering, Faculty of EngineeringToyama Prefectural UniversityToyamaJapan
  2. 2.Department of Industrial ChemistryToyama National College of TechnologyToyamaJapan

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