The mechanical properties of PMMA and its copolymers with ethyl methacrylate and butyl methacrylate
- 753 Downloads
The mechanical properties of polymethyl methacrylate and copolymers formed with both ethyl methacrylate and butyl methacrylate were investigated. Six polymers were produced by bulk polymerization, measured for molecular weight and glass transition temperature, Tgand assessed for modulus of elasticity and fracture toughness. Increasing the concentration of ethyl methacrylate or butyl methacrylate resulted in a linear decrease in the glass transition temperature, modulus of elasticity, and fracture toughness. A comparison of testing environments revealed that the modulus of elasticity was reduced when conditioned and tested in water at 37 °C compared to ambient laboratory conditions for all polymers. Similar comparisons of the fracture toughness showed an increase for testing in water at 37 °C; however, this was not significant for the lower Tgcompositions. Both modulus of elasticity and fracture toughness were strongly correlated with the glass transition temperature and composition.
KeywordsPolymer Molecular Weight Mechanical Property Fracture Toughness PMMA
Unable to display preview. Download preview PDF.
- 1.J. Charnley J. Bone Joint Surg. 42B (1960) 1265.Google Scholar
- 4.W. R. Krause and R. Mathis, J. Appl. Biomater. 22 (1988) 37.Google Scholar
- 8.R. Huiskes, Acta Orthop. Scand. Suppl. 185 (1979).Google Scholar
- 9.ASTM Standard D790-90, “in Annual Book of ASTM Standards”, Part 08.01 (American Society for Testing and Materials, Philadelphia, PA, 1990).Google Scholar
- 10.ASTM Standard E399-83, in “Annual Book of ASTM Standards”, Part 03.01 (American Society of Testing and Materials, Philadelphia, PA, 1990).Google Scholar
- 15.J. A. Brydson, “Plastic Materials” (Butterworth, UK, London, 1982).Google Scholar
- 20.J. A. Johnson, D. W. Jones, A. S. Rizkalla and H. W. King, in “Proceedings of the 68th General Session of the International Association for Dental Research”, Cincinnati, March 1990, p. 207.Google Scholar
- 21.R. W. Phillips, “Science of Dental Materials” (Saunders, Philadelphia, PA, 1982).Google Scholar