Journal of Industrial and Engineering Chemistry

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Influence of the 1,2-Unit Content of SBR and Filler Systems on Thermal Aging Behaviors of SBR Composites

Choi, Sung-Seen;Kim, Jong-Chul

  • Published : 20071100
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Abstract

Thermal aging behaviors of SBR vulcanizates reinforced with silica or carbon black was studied in terms of the crosslink density change. Three types of SBR with the different 1,2-unit contents of 18, 25, and 60wt% were used and influence of the 1,2-unit content of SBR on the thermal aging behaviors was investigated. Thermal aging experiments were carried out in a convection oven at 60, 70, 80, 90, and 100 ℃ for 3 and 7 days. Crosslink densities of the SBR vulcanizates were increased after the thermal aging and the level of the crosslink density change was also increased by increasing the aging temperature and time. The crosslink density change tended to reduce as the 1,2-unit content of SBR increased. The crosslink density changes of the silica-filled SBR vulcanizates without a silane coupling agent were larger than those of the SBR specimens with the filler systems of carbon black and silica containing a silane coupling agent. The experimental results were explained with the adsorption and desorption of curatives in the silica-filled samples and filler-polymer interactions of 1,2-unit. Activation energies for the crosslink density changes were calculated from the Arrhenius plots and compared in terms of the 1,2-unit contents and the filler systems.

Keywords

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