Polymers | Monitoring the oxidation of polyolefins using FTIR spectroscopy
High-density polyethylene (HDPE) undergoes oxidative degradation when exposed to ultraviolet (UV) radiation or chemically reactive oxidative media such as chlorine dioxide (ClO₂). FTIR spectroscopy provides a powerful tool for monitoring the formation of oxygen-containing functional groups and for distinguishing different oxidation pathways.
Why oxidation of polyolefins matters
Polyolefins such as polyethylene (PE) are widely used in demanding applications including pressure pipes, geomembranes, food and pharmaceutical packaging, and medical devices. Their popularity stems from excellent chemical resistance, low cost, and robust mechanical properties. However, these materials are inherently susceptible to oxidative degradation when exposed to heat, ultraviolet radiation, mechanical stress, or reactive chemical environments.
Oxidation leads to molecular chain scission, crosslinking, and formation of oxygen-containing species, resulting in embrittlement, discoloration, loss of ductility, and reduced long-term performance. For infrastructure components such as water and gas pipes or geomembranes, oxidation is a critical lifetime-limiting process with major safety and economic implications. In packaging and medical applications, oxidation can compromise barrier performance, induce off-odors, and jeopardize regulatory compliance. Understanding and monitoring oxidation pathways is therefore essential for predicting service lifetimes, optimizing stabilizer systems, ensuring product reliability, and diagnosing failures.
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