Effect of Siloxane Oligomer on Thermal Stability and Internal Stress of Epoxy Resins

실록산 올리고머가 에폭시 수지의 열안정성 및 내부응력에 미치는 영향

  • Kwak, Geun-Ho (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, Soo-Jin (Advanced Materials Division, Korea Research Institute of Chemical Technology) ;
  • Park, Jun-Ha (School of Chemical Engineering, Chungbuk National University) ;
  • Kim, Kong-Soo (School of Chemical Engineering, Chungbuk National University)
  • 곽근호 (한국화학연구소 화학소재연구부) ;
  • 박수진 (한국화학연구소 화학소재연구부) ;
  • 박준하 (충북대학교 화학공업부) ;
  • 김공수 (충북대학교 화학공업부)
  • Received : 1999.02.22
  • Accepted : 1999.06.05
  • Published : 1999.08.10

Abstract

The effect of siloxane oligomer content on thermal stability and internal stress of DGEBA epoxy resin was investigated. Siloxane-epoxy polymers having terminal epoxy group were prepared by reaction of siloxane-DDM prepolymer with DGEBA epoxy resin. Thermal stability was studied in terms of the initial decomposition temperature(IDT), temperature of maximum rate of weight loss($T_{max}$), integral procedural decomposition temperature(IPDT), and decomposition activation energy($E_t$) using TGA data. The thermal stability increased with increasing the siloxane oligomer content and showed a maximum value in the case of 5 wt% siloxane oligomer content in the blend system. While, the coefficient of thermal expansion(${\alpha}_r$) and the flexural modulus($E_r$) allowed us to study internal stress of the blend system. As the content of siloxane oligomer increases, the internal stress systematically decreases as decreasing both ${\alpha}_r$ and $E_r$.

Acknowledgement

Supported by : 서울대학교

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