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This research aimed to analyze the effects of rubber content and types (ground rubber tire and STR 5L) on mechanical properties of thermoplastic elastomer. In manufacturing the thermoplastic elastomer, a twin-screw extruder was used to blend mixture components. The thermoplastic elastomer pellets were then molded in a compression molding machine as sample panels. Analysis of variance (ANOVA) indicated that the ground rubber tire and STR 5L contents in the range of 30-70 wt% significantly (p-value < 0.05) affected modulus of rupture (MOR), modulus of elasticity (MOE), tensile strength (TS), tensile modulus (TM), maximum strain and hardness of the thermoplastic elastomer. The addition of ground rubber tire or STR 5L in range of 30-70 wt% resulted a decrease in MOR, MOE, TS, TM and hardness but an increase in the maximum strain of the thermoplastic elastomer. Furthermore, the thermoplastic elastomer blended with the ground rubber tire clearly provided higher MOR, MOE, TS, TM and hardness than blended with the STR 5L, whereas the thermoplastic elastomer with the STR 5L showed larger maximum strain. Finally, morphology of the thermoplastic elastomer revealed that plastic and rubber were immiscible polymer blends.
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