• 제목/요약/키워드: phenyl vinyl methyl silicone rubber

검색결과 1건 처리시간 0.017초

Effect of Phenyl Vinyl Methyl Silicone (PVMQ) on Low Temperature Sealing Performance of Fluorosilicone Composites

  • Lee, Jin Hyok;Bae, Jong Woo;Choi, Myoung Chan;Yun, Yu-Mi;Jo, Nam-Ju
    • Elastomers and Composites
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    • 제56권4호
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    • pp.209-216
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    • 2021
  • In this study, we observed the mechanical properties, thermal stability, and low temperature sealing performance of fluorosilicone elastic composites. When the blend ratio of Phenyl vinyl methyl silicone (PVMQ) was increased, the tensile strength, modulus at 100%, and compression set were decreased. The thermal stability of fluorosilicone elastic composites showed a similar tendency. These were caused by poorer green strength of PVMQ than Fluorosilicone rubber (FVMQ). The change in the tensile strength and elongation at -40℃ showed a decreasing tendency with increasing PVMQ blend ratio. By increasing the PVMQ blend ratio, low-temperature performance was improved. The Dynamic mechanical analysis (DMA) results showed that Tg was decreased and low-temperature performance was improved with increasing PVMQ blend ratio. However tanδ was decreased becaused of the poor green strength and elasticity of PVMQ. From a hysteresis loss at -40℃, the hysteresis loss value was increased and fluorosilicone elastic composites showed the decreasing tendency of elasticity with increasing PVMQ blend ratio. From the TR test, TR10 was decreased with increasing PVMQ blend ratio. FS-4 (45% PVMQ blended composites) showed a TR10 of -68.0℃ that was 5℃ lower than that of FS-1 (100% FVMQ). The gas leakage temperature was decreased with increasing PVMQ blend ratio. The gas leakage temperature of FS-4 was -69.2℃ that was 5℃ lower than that of FS-1. Caused by the polymer chain started to transfer from a glassy state to a rubbery state and had a mobility of chain under Tg, the gas leakage temperature showed a lower value than Tg. The sealing performance at low temperature was dominated by Tg that directly affected the mobility of the polymer chain.