The Effect of Strain Rate and Temperature onthe Mechanical Properties of Poly (Methyl Methacrylateco-Styrene) Copolymers
M.Z. Abdul Rahman,
W.F. Wan Abdullah
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 Youngs 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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