Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Effect of Phenyl Vinyl Methyl Silicone (PVMQ) on Low Temperature Sealing Performance of Fluorosilicone Composites

  • Lee, Jin Hyok (Department of Polymer Engineering, Pusan National University) ;
  • Bae, Jong Woo (Rubber Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Choi, Myoung Chan (Rubber Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Yun, Yu-Mi (Rubber Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Jo, Nam-Ju (Department of Polymer Engineering, Pusan National University)
  • Received : 2021.10.19
  • Accepted : 2021.11.22
  • Published : 2021.12.31
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Abstract

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.

Keywords

Acknowledgement

본 연구는 한국산업기술평가관리원의 지원을 받는 산업기술혁신사업(과제번호 20011150)을 통해 수행된 연구이며, 이에 감사드립니다.

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