A Study on the Thermal Life-Time Expectation of a NR Rubber Material using Isothermal TGA and TMA

등온 TGA 및 TMA를 이용한 NR고무소재의 내열수명 예측에 관한 연구

  • Ahn, Won-Sool (Department of Chemical Engineering, Keimyung University) ;
  • Park, Ki-Ho (Department of Chemical Engineering, Keimyung University)
  • 안원술 (계명대학교 화학공학과) ;
  • 박기호 (계명대학교 화학공학과)
  • Published : 2009.09.30

Abstract

A study on the life-time expectation of a CR-modified NR rubber composite through the change of thermal degradation characteristics was performed using both isothermal thermogravimetric analysis (TGA) and thermomechanical analysis (TMA). Master curves at reference temperature of $90^{\circ}C$ could be obtained with shift factor $a_T$, which was determined empirically using Time-Temperature Superposition Principle (TTSP). Activation energies could be calculated from the slope of Arrhenius plot of shift factor and showed similar values of $E_{a,TGA}$= 41.2 and $E_{a,TMA}$= 54.5 kJ/mol, respectively. It was considered from the results that chemical degradation resulting weight loss of the sample might be closely related to a physical degradation such as the dimensional change of the sample.

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