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<p>Ablative polymer materials are widely used in thermal protection applications because of their excellent elasticity, electrical insulation, gas tightness, and ablation resistance. Ethylene Propylene Diene Monomer (EPDM) is one of the most promising ablative polymers due to its unique ablation resistance and favorable thermomechanical properties. Accurate thermophysical data for EPDM are essential for the precise design of thermal protection structures. These properties are required for thermal-response and ablation modeling, as they directly affect performance prediction and the structural design of thermal protection systems. However, the thermophysical properties of EPDM under ablative conditions remain insufficiently characterized. Therefore, this study experimentally characterized the thermophysical properties of EPDM elastomer before and after ablation. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were adopted to characterize thermal degradation behavior and specific heat capacity of EPDM over 25–600&#xa0;℃. Thermal conductivity was measured by the 1D steady-state method for surface-ablated samples over 23–605&#xa0;℃ and the transient plane source (TPS) method for bulk-ablated samples over 27–483&#xa0;℃. The spectral emissivity of EPDM before and after ablation was determined using an energy-balance calibration method with a Fourier transform infrared spectrometer. The results indicate that EPDM undergoes significant degradation and ablation at elevated temperatures, accompanied by marked reductions in its thermophysical properties. The mechanisms underlying these changes were also discussed.</p>

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Experimental Study of the Thermal Property Evolution of EPDM During Ablation for Thermal Protection Applications

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Wenbin Li,
  • Liang Ji,
  • Hu Zhang

摘要

Ablative polymer materials are widely used in thermal protection applications because of their excellent elasticity, electrical insulation, gas tightness, and ablation resistance. Ethylene Propylene Diene Monomer (EPDM) is one of the most promising ablative polymers due to its unique ablation resistance and favorable thermomechanical properties. Accurate thermophysical data for EPDM are essential for the precise design of thermal protection structures. These properties are required for thermal-response and ablation modeling, as they directly affect performance prediction and the structural design of thermal protection systems. However, the thermophysical properties of EPDM under ablative conditions remain insufficiently characterized. Therefore, this study experimentally characterized the thermophysical properties of EPDM elastomer before and after ablation. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were adopted to characterize thermal degradation behavior and specific heat capacity of EPDM over 25–600 ℃. Thermal conductivity was measured by the 1D steady-state method for surface-ablated samples over 23–605 ℃ and the transient plane source (TPS) method for bulk-ablated samples over 27–483 ℃. The spectral emissivity of EPDM before and after ablation was determined using an energy-balance calibration method with a Fourier transform infrared spectrometer. The results indicate that EPDM undergoes significant degradation and ablation at elevated temperatures, accompanied by marked reductions in its thermophysical properties. The mechanisms underlying these changes were also discussed.