Abstract
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.
Highlights
In recent years, there is increasing interest in marine pollution owing to the effect of microplastics [1,2]
Microplastics are defined as particles of less than 5 mm in size and depending on the plastic, it has been shown that various chemicals and toxic blends can be absorbed onto their surface [3]
poly(butylene adipate-co-telephtharate) (PBAT), poly(butylene succinate) (PBS), and polylactic acid (PLA), which were not shown microbial metabolism estimated by biological oxygen demand (BOD) test, showed slight decrease of molecular metabolism estimatedinby biological demand test,which showed slight microbial decrease of molecular weight by hydrolysis seawater
Summary
There is increasing interest in marine pollution owing to the effect of microplastics [1,2]. Since PHA plastics degrade and disappear in seawater, toxic blends bound microplastics have no existence in marine environment [6]. Among the PHAs, poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx, Figure 1) shows excellent flexibility, because the 3-hydroxyhexanoate (3-HHx) unit (Figure 1b) is not taken into the crystallized. PCL showed (PHBV) or PCL showed excellent biodegradation in seawater [11,12,13,14,15,16]. The biodegradability of these blends in the biodegradability of these blends in seawater needs to be investigated. Polyesters in the biodegradable (as PBAT and PBS) and poorly biodegradable (as PLA) polyestersblends in the(powder blends and sheets). The effect of surface morphology of PHBHHx/PBAT with several biodegradable polyesters. The effect of surface morphology and of PHBHHx/PLA sheets was investigated in this study. PHBHHx/PBAT and PHBHHx/PLA sheets was investigated in this study
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