Study on the Aerobic Biodegradation Ability of Polylactic Acid in Seawater Environment
The aerobic biodegradation ability of polylactic acid in seawater environment was studied using a volume counting closed breathing apparatus.The determination of degradable components and the effects of addition amount and sample size on biodegradation rate were studied.The results indicate that determining the degradable components is an important step before conducting biodegradability testing,and infrared spectroscopy analysis can quickly determine them,which has significant practical significance for testing;the optimal addition amount of testing materials can shorten the testing cycle and achieve good parallelism results.Taking into account all factors,the optimal addition amount is 0.2 g;the size of the test material should be less than 2 mm×2 mm,which can adhere to the sediment and has a large specific surface area,which is conducive to the decomposition of the material by aerobic microorganisms and improves the degradation rate.
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