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      https://www.ias.ac.in/article/fulltext/boms/043/0162

    • Keywords

       

      TGA; isothermal; non-isothermal; activation energy; Arrhenius equation.

    • Abstract

       

      Structural epoxy adhesive was investigated for its thermal stability and degradation behaviour in a thermooxidative environment by thermogravimetry analysis (TGA). Non-isothermal TGA was performed at temperatures between30 and 600$^{\circ}$C utilizing different heating rates. The ageing characteristics of material were determined by an accelerated ageing study using isothermal TGA at different temperatures for 5% threshold conversion. The activation energies from both non-isothermal TGA and isothermal TGA were estimated and the activation energy values for 5% degradation from both the methods were in good agreement. The epoxy adhesive with titanium dioxide as filler showed a shelf life exceeding 13 years at ambient conditions (27$^{\circ}$C). Additionally, the lap shear strength of the adhesive joint was also tested after treating thesamples at 70$^{\circ}$C with 90% relative humidity to evaluate the hydrothermal effect on adhesive joint.

    • Author Affiliations

       

      TANU SRIVASTAVA1 2 NARESH KUMAR KATARI2 BALAJI RAO RAVURI3 JUHI KUSHWAHA4 S KRISHNA MOHAN1 SREEKANTHA B JONNALAGADDA5

      1. Dr APJ Abdul Kalam Missile Complex, Defence Research and Development Laboratory, DRDO, Hyderabad 500058, India
      2. Department of Chemistry, GITAM Deemed to be University, Rudraram, Patancheru, Hyderabad 502329, India
      3. Department of Physics, School of Science, GITAM Deemed to be University, Hyderabad 502329, India
      4. Dr APJ Abdul Kalam Missile Complex, Advanced Systems Laboratory, DRDO, Hyderabad 500058, India
      5. School of Chemistry and Physics, College of Agriculture, Engineering and Science, Westville Campus, University of KwaZulu-Natal, 54001, Durban 4000, South Africa
    • Dates

       
  • Bulletin of Materials Science | News

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