Effect of Silicone Rubber Content on Thermal Stabilities of EPDM/Silicone Blends

실리콘고무 함량이 EPDM 고무의 열적 안정성에 미치는 영향

  • Park, Soo-Jin (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Kim, Jong-Hak (Reliability Assessment Center, Korea Research Institute of Chemical Technology) ;
  • Joo, Hyeok-Jong (Department of Polymer Science and Engineering, Chungnam National University) ;
  • Jin, Fan-Long (Advanced Materials Division, Korea Research Institute of Chemical Technology)
  • 박수진 (한국화학연구원 화학소재연구부) ;
  • 김종학 (한국화학연구원 신뢰성평가센터) ;
  • 주혁종 (충남대학교 고분자공학과) ;
  • 김범용 (한국화학연구원 화학소재연구부)
  • Published : 2005.12.31

Abstract

In this work, the thermal stability factors, such as the thermal decomposition temperature, decomposition activation energy ($E_d$), and char yield, were measured to investigate the effect of silicone rubber (SR) content on the thermal stabilities of EPDM/SR blends. As a result, the thermal decomposition curve of EPDM/SR blends was similar to the neat EPDM rubber at 10 wt% SR and the thermal decomposition temperature increased above this content. The $E_d$ value of EPDM rubber initially decreased and then was constant above 20 wt% weight losses. The $E_d$ of EPDM/SR blends was higher than that of the neat EPDM rubber and then decreased with increasing the weight loss when the SR content was in the range of 10-20 wt%. Whereas the $E_d$ of the blends was lower than that of the EPDM rubber and then decreased with increasing the weight loss when 30 wt% SR was added. The char yield at $800^{\circ}C$ increased with increasing the SR content, because the decomposition of silane groups in the backbone was capable of forming a silane-rich residue after the initial stage of thermal degradation, which finally prevents further heat transfer and diffusion in the blends.

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