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Microbial Degradation Behavior in Seawater of Polyester Blends Containing Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx)
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Researchers tested the marine biodegradability of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and its blends with PBAT, PBS, and PLA using a biochemical oxygen demand method in seawater, finding that PHBHHx alone degraded efficiently and that blend degradation rates decreased proportionally with lower PHBHHx content. Surface morphology of the blend sheets was identified as a key factor controlling overall biodegradation rates.
The microbial degradation behavior of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and its compound with several polyesters such as poly(butylene adipate-co-telephtharate) (PBAT), poly(butylene succinate) (PBS), and polylactic acid (PLA) in seawater was tested by a biological oxygen demand (BOD) method. PHBHHx showed excellent biodegradation in seawater in this study. In addition, the biodegradation rate of several blends was much influenced by the weight ratio of PHBHHx in their blends and decreased in accordance with the decrement of PHBHHX ratio. The surface morphology of the sheet was important factor for controlling the biodegradation rate of PHBHHx-containing blends in seawater.
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Researchers examined the photodegradation dynamics of the biodegradable polymer PHBH under simulated UV conditions and assessed the effects on its marine biodegradability. UV weathering altered PHBH's surface properties and modified its degradation rate in marine environments, raising questions about the environmental safety claims for this material.
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Researchers investigated the photodegradation of the biodegradable polymer PHBH under accelerated UV exposure and tested whether photodegradation affected its marine biodegradability. They found that UV exposure degraded PHBH's surface and altered its biodegradation rate in seawater, suggesting that environmental weathering affects this supposedly ocean-safe material.
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This study tested four biodegradable plastics for degradation in seawater with and without marine sand, finding that poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) was the most biodegradable type and that sand addition significantly accelerated its breakdown. The dominant biofilm community on the plastic was Rhodobacteraceae, predicted to contribute to PHBH degradation.
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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.
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