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<p>Polylactic acid (PLA) is a biodegradable thermoplastic derived from renewable resources, predominantly corn starch and sugarcane. Its biodegradability has made PLA a popular choice for producing environmentally friendly material. This study examines the degradation behavior of PLA under various conditions, including seawater, UV radiation, and a combination of both, simulating real-world environments to assess its stability and breakdown processes. PLA samples were immersed in artificial seawater and exposed to ultraviolet light in a controlled chamber. The specimens were monitored over an extended period of 15, 30, 60, 90, 120, 180, 270, and 365 days. After the degradation period, the specimens were subjected to tensile testing to evaluate their mechanical properties. The results revealed a progressive reduction in tensile strength and elongation at break with increasing exposure time. Under seawater exposure, the tensile strength decreased 45% after 365 days, while UV exposure led to a 33.5% decline. When subjected to both seawater and UV radiation, the initial tensile strength decreased by 50% after approximately 35 days. Hydrolytic degradation studies have revealed that PLA is susceptible to hydrolysis in the presence of moisture, leading to chain scission and oligomer formation. UV exposure leads to the formation of free radicals, causing chain scission and a decrease in molecular weight. Understanding the degradation mechanisms of PLA is crucial for optimizing its application and improving its environmental impact. This study contributes to the development of more sustainable and efficient strategies for managing PLA waste.</p>

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Behavior of polylactic acid under varied degradation scenarios

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • V. P. C. C. Bhering,
  • A. B. Furtado,
  • H. G. Rohem,
  • H. S. da Costa Mattos,
  • J. M. L. Reis

摘要

Polylactic acid (PLA) is a biodegradable thermoplastic derived from renewable resources, predominantly corn starch and sugarcane. Its biodegradability has made PLA a popular choice for producing environmentally friendly material. This study examines the degradation behavior of PLA under various conditions, including seawater, UV radiation, and a combination of both, simulating real-world environments to assess its stability and breakdown processes. PLA samples were immersed in artificial seawater and exposed to ultraviolet light in a controlled chamber. The specimens were monitored over an extended period of 15, 30, 60, 90, 120, 180, 270, and 365 days. After the degradation period, the specimens were subjected to tensile testing to evaluate their mechanical properties. The results revealed a progressive reduction in tensile strength and elongation at break with increasing exposure time. Under seawater exposure, the tensile strength decreased 45% after 365 days, while UV exposure led to a 33.5% decline. When subjected to both seawater and UV radiation, the initial tensile strength decreased by 50% after approximately 35 days. Hydrolytic degradation studies have revealed that PLA is susceptible to hydrolysis in the presence of moisture, leading to chain scission and oligomer formation. UV exposure leads to the formation of free radicals, causing chain scission and a decrease in molecular weight. Understanding the degradation mechanisms of PLA is crucial for optimizing its application and improving its environmental impact. This study contributes to the development of more sustainable and efficient strategies for managing PLA waste.