화학공학소재연구정보센터
Macromolecular Research, Vol.22, No.8, 820-825, August, 2014
Relaxation Behavior and Time-Temperature Superposition (TTS) Profiles of Thermally Aged Styrene-Butadiene Rubber (SBR)
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In this work, styrene-butadiene rubber (SBR) was thermally aged at 130 ℃ with ageing period up to 4 days. The relaxation behavior was studied by dynamic mechanical analysis (DMA) in temperature scanning mode at multifrequencies and the crosslinking network was characterized by swelling method. Glass transition temperature (Tg) and activation energies (Ea) during transition evaluated by Starkweather method were found to increase after ageing. Time-temperature superposition (TTS) procedure was performed to obtain master curve and shift factors (αT). The derived αTs were fitted by William-Landel-Ferry (WLF) and Vogel-Fulcher-Tamman (VFT) equations. WLF fitting parameters confirmed decreased free volume fraction (f ) and thermal expansion coefficient (αf) near Tg versus ageing time. Temperature dependent relaxation properties were examined by VFT fitting parameter D. It was found that the aged SBR displayed more brittle behavior, becoming more and more deviated from Arrhenius fashion. This phenomenon was illustrated by the enhanced intermolecular coupling and severe crosslinking during ageing.
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