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6. PLA degradation
Finished PLA products are exposed to different environmental conditions during their life cycle, which promotes degradation and leads to loss of properties. Degradation can be hydrolytic, microbial, photochemical, thermal or enzymatic and, depending on the application, can be an advantage or a disadvantage. This property opens up new opportunities for end-of-life recovery, such as chemical recycling and composting.
6.1 Hydrolytic degradation
Chemical degradation by hydrolysis is the main mechanism involved in PLA degradation, particularly in composters. Because of the ester bonds between each monomer unit, polyesters are sensitive to hydrolysis.
Water molecules react with PLA by cutting the easily cleavable ester bonds (figure...
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PLA degradation
End of life
Bibliography
- (1) - New BOPLA films. - Bioplastics Magazine (2023).
- (2) - E. B. &. N. Institute. - http://www.european-bioplastics.org (2016).
- ...
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- Evaluation of the ultimate aerobic biodegradability of plastic materials under controlled composting conditions – Method by analysis of released carbon dioxide. - ISO 14855 -
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