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Journal of Applied Sciences

Year: 2002  |  Volume: 2  |  Issue: 4  |  Page No.: 518 - 521

The Effect of Strain Rate and Temperature onthe Mechanical Properties of Poly (Methyl Methacrylateco-Styrene) Copolymers

S. Hamdan, D.M.A. Hashim, M.Z. Abdul Rahman, M. Ahmad and W.F. Wan Abdullah

Abstract

The thermo mechanical properties of poly (methyl methacrylate-co-styrene) copolymers as a function of strain rate and temperature in the range 10-3 to 10-1 s-1 and 30-200° C respectively were investigated. Copolymers of three different Methyl Methacrylate (MMA) and STyrene (ST) ratios with various percentages of cross-linking agents were prepared and tested. By measurement of the stress versus strain at various strain rates and temperatures, plots of flow stress/temperature (σƒ /T) versus strain rate (⋵) and log Young’s Modulus (log E) versus Temperature (T) were obtained. Plot of (σƒ /T versus ⋵ observed the Eyring equation. Increasing the amount of cross-linking agent improved the copolymer strength. The graph for log E versus T plot at constant stain rate indicates that a transition temperature exist at ~ 110 ° C. This is attributed to the glass transition i.e. the zones are interpreted in terms of visco-elastic transition.

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