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<p>This study investigates the degradation of colored (white and black, green on both sides and black on both sides) textured high-density polyethylene (HDPE) geomembranes with a nominal thickness of 1.00&#xa0;mm, subjected to fluorescent UV chamber exposure under controlled cycles of radiation and condensation for durations of 500, 1000, and 2000&#xa0;h. The geomembranes were manufactured using flat-die fabrication, a less common process. Degradation was evaluated by analyzing the retained Melt Flow Index (MFI) under high load (HLMI) and low load (LLMI), tensile properties including strength and strain at yield (elastic deformation limit) and at break (end of plastic deformation), and secant rigidity modulus (J<sub>s</sub>). Antioxidant depletion was assessed using Standard Oxidation Induction Time (Std-OIT) tests. Exponential decay models, including first-order and second-order equations, were applied to describe antioxidant depletion during stage I of oxidation. The first-order decay model, considering retained Std-OIT values, provided the best overall fit for the three geomembranes. The results showed that colored geomembranes exhibited faster antioxidant depletion rates than conventional black HDPE geomembranes.</p>

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Colored HDPE Textured Geomembranes Exposed to UV: Laboratory Insights into Material Degradation

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Maria Alejandra Aparicio-Ardila,
  • Clever Aparecido Valentin,
  • Jefferson Lins da Silva

摘要

This study investigates the degradation of colored (white and black, green on both sides and black on both sides) textured high-density polyethylene (HDPE) geomembranes with a nominal thickness of 1.00 mm, subjected to fluorescent UV chamber exposure under controlled cycles of radiation and condensation for durations of 500, 1000, and 2000 h. The geomembranes were manufactured using flat-die fabrication, a less common process. Degradation was evaluated by analyzing the retained Melt Flow Index (MFI) under high load (HLMI) and low load (LLMI), tensile properties including strength and strain at yield (elastic deformation limit) and at break (end of plastic deformation), and secant rigidity modulus (Js). Antioxidant depletion was assessed using Standard Oxidation Induction Time (Std-OIT) tests. Exponential decay models, including first-order and second-order equations, were applied to describe antioxidant depletion during stage I of oxidation. The first-order decay model, considering retained Std-OIT values, provided the best overall fit for the three geomembranes. The results showed that colored geomembranes exhibited faster antioxidant depletion rates than conventional black HDPE geomembranes.