Mechanical properties of syndiotactic polystyrene polymer blend

Abstract

This research is concemed with studying the mechanical properties of syndiotactic polystyrene (sPS) blend with several polymers such as poly (a-methyl styrene) (PaMS), poly (ethyl methacrylate) (PEMA), poly (n-butyl methacrylate) (PBMA), poly (cyclohexyl methacrylate) (PEMA), poly (n-butyl Methacrylte) (PBMA), poly (cyclohexyl mathacrylate) (PHMA) and poly (cis-isoprene) (PIP). From the experimental results, it was found that storage modulus (E’) of all sPS blend system decreased with increasing time and temperature but increased with increasing frequency. Moreover, storage modulus master curve was created for all blend system by using Time-Temperature Superposition (TTS) principle. Storage modulus of sPS blend can be predicted for a longer time and for more than the experiments frequency range of 0.01-100 Hz. Then the effects of sPS molecular weight on mechanical properties were determined by siing master curve comparison. Both of the two molecular weights of sPS have same trend in master curve. Strage moduluses of higher molecular weight sPS were higher then that of less molecular weight of aPS because higher polymer chain lengths were resulted in higher storage modulus. Futhermore., William landel and Ferry contants were reported by using shift factor calculated from creating master curves. All blend system that have the same molecular weight of sPS were compared by way of master curves. The same sPS blrnd behaveiors can be divided into three section sections as a function of frequency as the range over l x 10 , the range between l x 10 – 1 x 10 and the range under 1 x 10 Hz.