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<p>The thermal degradation of biopolymers limits their industrial and biomedical applications due to poor stability near processing temperatures. This study integrates thermorheology and thermoanalytical techniques to investigate the multiscale degradation behavior of three polyhydroxyalkanoates (PHAs): poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH). Rheological functions were used to track structural changes during processing. Properties such as mass loss and derivative thermogravimetric curves were monitored to obtain perception of degradation behaviour at decomposition temperature. The findings revealed distinct degradation behaviors across processing and decomposition regimes. In the processing temperature range (160–210&#xa0;°C), PHBH exhibited the highest resistance to thermal degradation. In contrast, at higher decomposition temperatures (&gt; 250&#xa0;°C), PHB and PHBV displayed higher activation energies. This combined methodology links structural evolution, degradation mechanisms, and macroscopic flow, providing a unified framework for assessing thermal stability of PHA and can be extended to other biodegradable polymers for process optimization and material design.</p>

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Multiscale thermal degradation of phas: kinetic and rheological analysis across processing and decomposition regimes

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Hadis Torabi,
  • Hadis Zarrin,
  • Ehsan Behzadfar

摘要

The thermal degradation of biopolymers limits their industrial and biomedical applications due to poor stability near processing temperatures. This study integrates thermorheology and thermoanalytical techniques to investigate the multiscale degradation behavior of three polyhydroxyalkanoates (PHAs): poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH). Rheological functions were used to track structural changes during processing. Properties such as mass loss and derivative thermogravimetric curves were monitored to obtain perception of degradation behaviour at decomposition temperature. The findings revealed distinct degradation behaviors across processing and decomposition regimes. In the processing temperature range (160–210 °C), PHBH exhibited the highest resistance to thermal degradation. In contrast, at higher decomposition temperatures (> 250 °C), PHB and PHBV displayed higher activation energies. This combined methodology links structural evolution, degradation mechanisms, and macroscopic flow, providing a unified framework for assessing thermal stability of PHA and can be extended to other biodegradable polymers for process optimization and material design.