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<p>In this study, the end-of-life options of PHBH and PBAT blends fabricated using twin-screw extrusion and injection moulding techniques were investigated. PBAT with high ductility was added to the brittle PHBH at varying ratios to improve its ductility and toughness. It was discovered that the blend comprising PHBH and PBAT in an 80/20 ratio exhibits good tensile strength, tensile modulus, and elongation at break when compared to other blends. The blend exhibited lower thermal stability when compared to neat PHBH and PBAT. The blends were also exposed to QUV radiation for degradation. The thermal stability of the blend was slightly improved with the increased exposure time. Visual analysis revealed photo-oxidative yellowing in the blends, and tensile properties were decreased with increased exposure time. FTIR spectroscopy displayed a carbonyl group at 1720&#xa0;cm<sup>− 1</sup>, confirming the degradation of the material. The results obtained by monitoring the integrity of the materials reveal that the material started biodegrading after 12 weeks and reached 90% in 180 days. The results demonstrate that the processed blends are compostable according to ASTM D5338, making composting a viable end-of-life disposal method for the blends.</p>

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End-of-life options of Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH)-based blends

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Asanda Mtibe,
  • N. E. Nomadolo,
  • T. C. Mokhena,
  • L. Hlekelele,
  • Maya Jacob John

摘要

In this study, the end-of-life options of PHBH and PBAT blends fabricated using twin-screw extrusion and injection moulding techniques were investigated. PBAT with high ductility was added to the brittle PHBH at varying ratios to improve its ductility and toughness. It was discovered that the blend comprising PHBH and PBAT in an 80/20 ratio exhibits good tensile strength, tensile modulus, and elongation at break when compared to other blends. The blend exhibited lower thermal stability when compared to neat PHBH and PBAT. The blends were also exposed to QUV radiation for degradation. The thermal stability of the blend was slightly improved with the increased exposure time. Visual analysis revealed photo-oxidative yellowing in the blends, and tensile properties were decreased with increased exposure time. FTIR spectroscopy displayed a carbonyl group at 1720 cm− 1, confirming the degradation of the material. The results obtained by monitoring the integrity of the materials reveal that the material started biodegrading after 12 weeks and reached 90% in 180 days. The results demonstrate that the processed blends are compostable according to ASTM D5338, making composting a viable end-of-life disposal method for the blends.