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<p>Thermal decomposition behavior of ultra high molecular weight polyethylene (UHMWPE) is studied through thermogravimetric analysis technique. Thermograms are recorded at five different heating rates (2.5, 5, 10, 15 and 20°C/min) in nitrogen environment. These thermograms revealed that the thermal decomposition of UHMWPE occurred in three different stages. Among these stages, the second stage of decomposition is highly complex. Therefore, deconvoluted into two peaks by using bi-Gaussian asymmetric function. Kinetic triplets related to these peaks are determined by adopting two iso-conversional kinetic models (Starink (SR) and Friedman (FR)). The reaction mechanism is also identified by using the integral master plot method. Finally, thermodynamic parameters viz. change in entropy (<i>∆S)</i>, change in enthalpy (<i>∆H)</i> and change in Gibbs free energy (<i>∆G)</i> are estimated at considered heating rates.</p>

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Non-isothermal Kinetic Analysis of UHMWPE Sheet

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Jagriti,
  • Nidhi Khattar,
  • Shagun Kainth,
  • Piyush Sharma,
  • P. K. Diwan

摘要

Thermal decomposition behavior of ultra high molecular weight polyethylene (UHMWPE) is studied through thermogravimetric analysis technique. Thermograms are recorded at five different heating rates (2.5, 5, 10, 15 and 20°C/min) in nitrogen environment. These thermograms revealed that the thermal decomposition of UHMWPE occurred in three different stages. Among these stages, the second stage of decomposition is highly complex. Therefore, deconvoluted into two peaks by using bi-Gaussian asymmetric function. Kinetic triplets related to these peaks are determined by adopting two iso-conversional kinetic models (Starink (SR) and Friedman (FR)). The reaction mechanism is also identified by using the integral master plot method. Finally, thermodynamic parameters viz. change in entropy (∆S), change in enthalpy (∆H) and change in Gibbs free energy (∆G) are estimated at considered heating rates.