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Marine (Bio)degradation of Polyhydroxyalkanoates and Polylactides
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Researchers reviewed the marine biodegradation of polyhydroxyalkanoates and polylactides, examining how water absorption and hydrolytic mechanisms govern degradation kinetics for these bio-sourced polyesters and assessing whether their "biodegradable" label holds up in real ocean conditions.
Given the wide variety of polyesters available today, this chapter focuses on two types: polyhydroxyalkanoates (PHAs) and polylactides (PLAs). PHAs and PLAs are currently among the most studied and promising polymers, since they can be both biosourced and biodegradable under certain conditions. The physicochemical properties of PHAs depend on their chemical composition, which in turn is influenced by the nature of the carbon source used for bacterial growth and PHA. Polyesters, such as PHAs or PLAs, are particularly sensitive to water. Knowledge of water absorption at the surface of these polymers, as well as water diffusion processes, is crucial for assessing and understanding hydrolytic degradation mechanisms and kinetics. In the current context of plastic pollution of seas and oceans, numerous studies have been carried out on the degradation of biodegradable polymers such as PLAs and PHAs in the marine environment.
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Researchers tracked the degradation of five biodegradable plastics in simulated marine environments over nearly a year, including materials like polylactic acid and polyhydroxybutyrate. While all materials showed signs of degradation such as surface cracking and weight loss from hydrolysis, they also released polymer fragments into surrounding sand, indicating that even biodegradable plastics can generate microplastic pollution. The findings suggest that labeling a plastic as biodegradable does not guarantee it will fully break down in ocean conditions.
Biodegradability of poly(3-hydroxyalkanoate) and poly(ε-caprolactone) via biological carbon cycles in marine environments
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The marine biodegradability of poly(3-hydroxyalkanoate) (PHA) and poly(epsilon-caprolactone) (PCL) biopolymers was tested through biological degradation assays, evaluating their potential as truly marine-degradable plastic alternatives. Both polymers showed evidence of marine biodegradation, though rates varied with environmental conditions, offering promise as plastics that would not persist in ocean environments.
Étude du vieillissement de biopolymères en milieu marin
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Researchers studied how biodegradable polymers PLA and PHA degrade in marine environments under realistic conditions, finding that degradation rates and pathways depend strongly on temperature, UV exposure, and microbial activity, with implications for how quickly these materials break down at sea.
Poly(hydroxyalkanoates): Production, Applications and End-of-Life Strategies–Life Cycle Assessment Nexus
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This review examines the production, applications, and end-of-life strategies for polyhydroxyalkanoates, highlighting their unique ability to biodegrade in marine environments as a promising alternative to petroleum-based plastics.
Biodegradability of polyhydroxyalkanoate (PHA) biopolyesters in nature: a review
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This comprehensive review examined the biodegradation of polyhydroxyalkanoates (PHA) biopolyesters in fresh water, sea water, soil, and composting and anaerobic conditions, comparing how monomer composition and microstructure influence biodegradation rates across environments. The review synthesized information from over 150 identified PHA building blocks, arguing that PHA's natural circularity via microbial enzymatic biodegradation and production from renewable carbon sources positions it as a gold standard sustainable alternative to fossil-based plastics.
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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.