- Erstellt: Mittwoch, 18. März 2015 09:17
Lecture at 10 a.m.: Biodegradable polymers in real conditions
Assoc. Prof. Dr. Marek Koutny
Tomas Bata University in Zlín, Faculty of Technology, Department of Environmental Protection Engineering, nám. T.G.Masaryka 5555, 760 01 Zlín, Czech Republic
The biodegradability of polymers and polymeric materials depends strongly on conditions to which they are exposed. Consequently the actual biodegradability could be a complex interrelation between several biotic and abiotic factors. Even materials in the seemingly homogenous group of polyesters like PCL, PBAT, PBS, PLA probably differ in their mechanism of the biodegradation. PLA and PBAT are both biodegraded almost exclusively under composting conditions but in the case PBAT this is probably caused with the requirement for specific enzymes produced by a group of thermophilic bacteria, PLA simply requires higher temperature because the abiotic hydrolysis of ester bonds, with its strongly temperature dependent kinetics, representing a necessary firsts step in the decomposition mechanism. Polymer biodegradation in real polymeric formulation could also be influenced by other components present in the given blends.
Acknowledgement: The mobility of the author was facilitated by AKTION Austria–Czech Republic project No: 70p8.
Stloukal, P., Koutny, M., Sedlarik, V., Kucharczyk, P. Biodegradation of high molecular weight polylactic acid (2012) AIP Conference Proceedings, 1459 (1), pp. 20-22.
Kopčilová, M., Hubáčková, J., Růžička, J., Dvořáčková, M., Julinová, M., Koutný, M., Tomalová, M., Alexy, P., Bugaj, P., Filip, J. Biodegradability and Mechanical Properties of Poly(vinyl alcohol)-Based Blend Plastics Prepared Through Extrusion Method (2013) Journal of Polymers and the Environment, 21 (1), pp. 88-94. Cited 1 time.
Stloukal, P., Jandak, J., Husarova, L., Koutny, M., Commereuc, S., Verney, V. Identification of several factors affecting biodegradation of aromatic-aliphatic copolyester (2010) International Conference on Development, Energy, Environment, Economics - Proceedings, pp. 118-121.
Starch filled PBAT incubated 20 days in soil. Parallel cracks along a bacterial filament are discernible. Stained with safranine, magnification 600×.
Prof. Dr. Marek Koutny … was born in Zlin, Czech Republic, studied Biochemistry at Masaryk University in Brno, Czech Republic, and later finished his Ph.D. dealing with electron transport chain of denitrifying bacteria the same institution under supervision of Prof. Igor Kucera. During his Ph.D. he also spend some time working at Free University of Amsterdam, Netherlands. In 1999 he obtained an assist. prof. position at Tomas Bata University in Zlin. In 2004-2005 he obtained and fulfilled a post doc fellowship at Blaise Pascal University in Clermont Ferrand, France, under supervision of prof. Anne-Marie Delort. In 2007 he obtained an assoc. prof. post at Tomas Bata University in Zlin. Among his interests are biodegradable polymers and polymeric materials, mechanism of biodegradation and microbiology of biodegradation.
Lecture at 10.45 a.m.: The influence of a hydrolysis-inhibiting additive on the degradation and biodegradation of PLA and its nanocomposites
Dr. Petr Stloukal
Tomas Bata University Zlin
PLA based materials can suffer from relative susceptibility of PLA towards hydrolysis. This could especially complicate thermoplastic processing of the materials because higher temperatures significantly increase the rate of hydrolytic reactions. Commercially available carbodiimide-based additive intended to stabilize PLA based materials against hydrolytic degradation were incorporated into a series of PLA and nanofiller containing PLA films. The influence of the additive on the subsequent degradability of the materials was studied under the conditions of melt processing, biodegradation in compost and abiotic hydrolysis. Identical films without the additive were used as reference materials. Adding an anti-hydrolysis agent significantly retarded the decomposition of PLA in all the degradation processes tested. Both biodegradation and the abiotic hydrolysis of the PLA-based materials investigated were substantially retarded. This effect was much less pronounced in a material with organically modified montmorillonite.
Acknowledgments: The work was supported by AKTION Austria–Czech Republic (70p8).
Dr. Petr Stloukal was born in Zlin, Czech republic. He received a MSc in chemical engineering at the University of Chemistry and Technology in Prague and PhD in Polymers technology at the Thomas Bata Univerzity in Zlin. Since 2013 he has been working as Scientific-pedagogical staff at Tomas Bata Univerzity in Zlin in Centre of polymer systems and Department of Department in environment protection engineering. His research interests include Biodegradable polymers especially PLA and their applications in agriculture and environmental science.
Date: Wednesday, 25th March 2015, 10 a.m.
Location: Meetig room PCCL, Roseggerstrasse 12, 8700 Leoben (3rd level)