Published October 29, 2022 | Version v1
Journal article Open

Assessing the Time Dependence of AOPs on the Surface Properties of Polylactic Acid

  • 1. Clausthal Centre for Materials Technology (CZM), Clausthal University of Technology, Leibnizstr. 9, 38678 Clausthal-Zellerfeld, Germany
  • 2. Institute for Electrochemistry, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany
  • 3. School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechneiou St., Zografou Campus, 15773 Athens, Greece


Plastics are artifcial synthetic organic polymers that have been used in every area of daily life. However, because of their slow degradation rate, their use is contentious. The treatment of the surface of the sample is considered necessary as enzymatic or bacterial attach is not possible if the plastic surface environment is not ideal. The main topic of this work is the investigation of the efect of diferent advanced oxidation processes (AOP) on the near surface structure of polylactic acid (PLA) samples, which, in turn, can promote the adhesion of enzymes or bacteria for further biodegradation. The Advanced Oxidation Processes that have been used are Ultrasonication, UV photodegradation and Dielectric Barrier Discharge (DBD) plasma. After the treatments, the surfaces were characterized by Infrared Spectroscopy (IR), Drop Contact Angle (DCA), Confocal Laser Scanning Microscopy (CLSM) and X-ray Photoelectron Spectroscopy (XPS). Both ultrasonic and UV treatments have a signifcant impact on the surface properties of immersed PLA by removing the oxygen-containing groups of the polymer chain, albeit in diferent ways, while plasma tends to uncover oxygen groups on the surface. The infuence of the pre-treatment on improving the adhesion of bacteria on the PLA surface has been proven using a Pseudomonas Knackmussii strain.


116) Kalogirou et al. - Assessing the Time Dependence of AOPs on the Surface Properties of Polylactic Acid - J Polymers and the Environment 2022.pdf

Additional details


BioICEP – Bio Innovation of a Circular Economy for Plastics 870292
European Commission