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High-Resistant Packaging EPDM/SEBS Blends Processed by γ-Irradiation.

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Radiation processing enhances thermal stability in ethylene-propylene-diene monomer (EPDM) and styrene-ethylene-butylene-styrene (SEBS) blends. Increasing SEBS content improves material performance, offering insights into polymer processing for high-performance applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Radiation Chemistry

Background:

  • Ethylene-propylene-diene monomer (EPDM) and styrene-ethylene-butylene-styrene (SEBS) are widely used polymers.
  • Understanding their thermal stability after radiation processing is crucial for material applications.
  • Radiation processing offers a method to modify polymer properties.

Purpose of the Study:

  • To investigate the thermal stability of EPDM/SEBS blends after gamma irradiation.
  • To evaluate the effect of different blend ratios and irradiation doses on thermal properties.
  • To elucidate the mechanisms of radiation-induced crosslinking and degradation.

Main Methods:

  • Gamma irradiation of EPDM/SEBS blends at various doses (25-150 kGy).
  • Chemiluminescence (CL) analysis to assess thermal stability and oxidation induction times (OIT).
  • Gel content analysis and calculation of activation energies for oxidative degradation.

Main Results:

  • EPDM acts as the primary radical source for crosslinking, while SEBS provides structural frameworks.
  • Increasing SEBS content in the blend significantly improves thermal stability.
  • Activation energies for oxidative degradation increase with SEBS proportion and irradiation dose.
  • Gel formation correlates well with chemiluminescence results.

Conclusions:

  • Radiation processing, particularly with higher SEBS content, enhances the thermal stability of EPDM/SEBS blends.
  • The study provides insights into the synergistic effects of EPDM and SEBS under irradiation.
  • Optimized selection of technological parameters in radiation processing can yield high-performance polymer materials.