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<p>Sustainable and biodegradable biocomposite films were developed using renewable materials, specifically poly(lactic acid) (PLA), natural rubber (NR), and rice straw (RS), an agricultural waste product in Thailand. The PLA/NR blend was maintained at a fixed ratio of 70/30 weight% (wt%) and compounded with 3, 5, and 7 wt% RS powder before being processed into cast films. All PLA/NR/RS biocomposite films exhibited an elongation at break exceeding 35%—approximately eight times greater than that of neat PLA. The films displayed opaque characteristics and effective water retention. They were utilized as mulch for eggplant cultivation. After 90 days of growth, eggplants grown with the PLA/NR/RS7% film produced fruit and showed the highest dry mass (65.53 ± 6.40&#xa0;g/plant). The weight loss of biocomposite films increased with higher RS content. FE-SEM analysis revealed numerous cracks and holes on the surfaces of all PLA/NR/RS biocomposite films, while GPC results indicated a decrease in the molecular weight of PLA within the composite after cultivation. Following their use as mulch films, the crystallinity in the PLA phase increased. The findings of this study suggest that PLA/NR/RS biocomposite films have potential as eco-friendly mulch films in agriculture.</p>

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Biodegradable mulch films from poly(lactic acid)/natural rubber/agro-waste biocomposites for sustainable agricultural applications

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Wachirabhorn Pongputthipat,
  • Yupaporn Ruksakulpiwat,
  • Chaiwat Ruksakulpiwat,
  • Kasama Jarukumjorn,
  • Pranee Chumsamrong

摘要

Sustainable and biodegradable biocomposite films were developed using renewable materials, specifically poly(lactic acid) (PLA), natural rubber (NR), and rice straw (RS), an agricultural waste product in Thailand. The PLA/NR blend was maintained at a fixed ratio of 70/30 weight% (wt%) and compounded with 3, 5, and 7 wt% RS powder before being processed into cast films. All PLA/NR/RS biocomposite films exhibited an elongation at break exceeding 35%—approximately eight times greater than that of neat PLA. The films displayed opaque characteristics and effective water retention. They were utilized as mulch for eggplant cultivation. After 90 days of growth, eggplants grown with the PLA/NR/RS7% film produced fruit and showed the highest dry mass (65.53 ± 6.40 g/plant). The weight loss of biocomposite films increased with higher RS content. FE-SEM analysis revealed numerous cracks and holes on the surfaces of all PLA/NR/RS biocomposite films, while GPC results indicated a decrease in the molecular weight of PLA within the composite after cultivation. Following their use as mulch films, the crystallinity in the PLA phase increased. The findings of this study suggest that PLA/NR/RS biocomposite films have potential as eco-friendly mulch films in agriculture.