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Biodegradable Thermoplastic Materials with Application in the Manufacture of Bags Without Synthetic Polymers
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Researchers developed biodegradable, compostable bags from starch, polylactic acid, and glycerol as alternatives to conventional plastic bags, finding that after three months of soil burial the new materials showed significant degradation while standard polyethylene bags remained intact, meeting European compostability standards.
Non-degradable plastic bags are a major contributor to marine and soil pollution. They represent a significant percentage of the generated solid waste and can last for hundreds of years in the environment. The aim of the present study was to find alternatives to conventional non-degradable plastic bags by obtaining biodegradable and compostable bags starting from simple materials like starch, poly(lactic acid) (PLA), and glycerol. Increasing the strength and hardness of the polymer was achieved by adding a mineral (talcum). The preliminary studies indicated that two compositions are suitable for advanced testing to produce the initial granular material. These materials were tested for the determination of melt flow index (MFI), Fourier Transform Infrared Spectroscopy (FTIR), and the polymers response to heating (thermogravimetric analysis, TGA and differential scanning calorimetry, DSC). The polymer biodegradability was evaluated by burial in two types of soil. The obtained results were compared with the same set of experiments performed on conventional polyethylene bags. After three months in the soil, only the materials synthesized in this study show signs of accentuated degradation while polyethylene bags are still intact. The surface morphology was explored by scanning electron microscopy (SEM). The results indicated that the biodegradable thermoplastic material meets the requirements of the European standard EN13432/2002 regarding compostable and biodegradable packaging.
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Researchers tested five commercially sold 'biodegradable' plastic bags in soil burial and UV weathering experiments, finding that polyester-based bags degraded more readily than polyolefin-based ones, which showed minimal actual biodegradation under realistic environmental conditions.
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This study tested how different environmental conditions affect the degradation of bioplastics made from starch and glycerol. While bioplastics are marketed as eco-friendly alternatives to conventional plastics, this research examines whether they actually break down effectively in real-world conditions rather than only in controlled composting settings.
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"This review surveys the landscape of biodegradable polymers from both renewable and fossil-based sources, examining how polymer properties and environmental conditions influence biodegradation rates, along with methods for measuring biodegradability and toxicity. Researchers highlight applications in agriculture, medicine, and packaging while discussing the broader environmental implications of plastic biodegradation and future prospects for sustainable materials."
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This review examines the biodegradation characteristics of polylactic acid (PLA) materials, discussing the enzymatic and environmental conditions needed for effective breakdown and evaluating PLA's potential as a genuinely biodegradable alternative to conventional petroleum-based plastics.
Anaerobic digestion of commercial PLA and PBAT biodegradable plastic bags: Potential biogas production and 1H NMR and ATR-FTIR assessed biodegradation
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This study tested six commercial compostable plastic bags made from PLA and PBAT under anaerobic digestion conditions, finding that none degraded adequately at mesophilic temperatures — biodegradation occurred mainly in the PLA fraction — and none met the EN 13432 compostability standard, raising concerns about their real-world biodegradability claims.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.