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Degradation and Disintegration Behavior of PHBV- and PLA-Based Films Under Composting Conditions
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Researchers evaluated the composting performance of biobased PLA and PHBV multilayer films, finding that PLA-based films achieved up to 99% biodegradation while multilayer combinations degraded more slowly — suggesting that increasing PLA content in composite films is necessary to meet the 90% biodegradability threshold required by European standards.
This study investigated the degradation and disintegration behavior of novel biobased multilayered films composed of poly(lactic acid) (PLA) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) during controlled composting tests performed at the laboratory scale. The compostability of monolayer PLA and PHBV films, hot-pressed bilayers, and coextruded multilayer films produced in industrial or semi-industrial settings was systematically evaluated. Materials supplied by Fraunhofer LBF (Darmstadt, Germany) were tested as specified by the EVS-EN standard ISO 14855-1:2012 and EVS-EN ISO 20200:2016 standards. Composting took place in sealed, aerated vessels at 58 ± 2 °C with 50 ± 5% moisture and >6% oxygen. Biodegradation was measured via CO2 evolution, and disintegration was assessed visually and physically. PLA-1OLA films achieved 98.59% biodegradation and 91.13% disintegration. PHBV-5OLA and multilayer PLA-1OLA/PHBV-5OLA films showed biodegradation rates of 85.49% and 73.14%, with disintegration degrees of 89.93% and 79.18%, respectively. However, modified multilayer structures displayed slightly reduced compostability compared with pure compounds, likely due to the influence of additional components. To meet the 90% biodegradability threshold required by EVS-EN 13432:2003, increasing the PLA-1OLA content is recommended. This study introduces a novel combination of biobased polymers and plasticizers in multilayer formats, offering a deeper understanding of structure–property–degradation relationships. Its significance lies in advancing the design of sustainable packaging materials that balance functionality with environmental compatibility.
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Biodegradation Studies of Polyhydroxybutyrate and Polyhydroxybutyrate-co-Polyhydroxyvalerate Films in Soil
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Researchers studied the biodegradation properties of two bioplastic polymers, polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-polyhydroxyvalerate (PHBV), in soil under different moisture conditions. Both polymers degraded completely in fully saturated soil, with the study tracking changes in appearance, chemical signatures, mechanical properties, and molecular weight, supporting these materials as viable biodegradable alternatives to conventional petrochemical-derived plastics.
Assessing the Biodegradation Characteristics of Poly(Butylene Succinate) and Poly(Lactic Acid) Formulations Under Controlled Composting Conditions
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Researchers assessed the biodegradation of PLA and PBS biopolymer films and granules under controlled composting conditions over six months. PLA-based materials showed limited degradation while PBS degraded more substantially, highlighting that compostability varies significantly among bioplastics and may be insufficient under real-world composting conditions.
Biodegradation in Freshwater: Comparison Between Compostable Plastics and Their Biopolymer Matrices
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This four-month in situ study compared degradation of compostable plastics (Mater-Bi bag, disposable dish) and their pure biopolymer matrices (PBAT, PLA, PHBV) in a lentic freshwater ecosystem, finding limited degradation of pure polymers within 120 days. PHBV showed the fastest degradation among tested polyesters, while compostable materials exhibited significant leaching of fillers leading to fragmentation, highlighting that laboratory tests may overestimate environmental biodegradability.
Biomimetic layered, ecological, advanced, multi-functional film for sustainable packaging
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Researchers developed a biomimetic multilayer film called LEAFF that integrates the structural principles of plant leaves to combine mechanical strength with rapid biodegradability, achieving complete soil degradation in five weeks. The film also achieves high transparency, water stability, and gas barrier properties, offering a promising sustainable alternative to conventional plastic packaging.
Degradation of Film and Rigid Bioplastics During the Thermophilic Phase and the Maturation Phase of Simulated Composting
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Researchers tested how well commercially certified compostable bioplastics (starch-based, PBAT, and PLA) actually degrade under realistic industrial composting conditions, finding that PLA degradation was highly sensitive to both plastic thickness and the duration of the high-temperature composting phase. The results suggest that current industrial composting timelines may be insufficient to fully break down certified compostable plastics, raising questions about real-world end-of-life claims.
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