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Kinetics and mechanism of the biodegradation of PLA/clay nanocomposites during thermophilic phase of composting process

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dc.title Kinetics and mechanism of the biodegradation of PLA/clay nanocomposites during thermophilic phase of composting process en
dc.contributor.author Stloukal, Petr
dc.contributor.author Pekařová, Silvie
dc.contributor.author Kalendová, Alena
dc.contributor.author Mattausch, Hannelore
dc.contributor.author Laske, Stephan
dc.contributor.author Holzer, Clemens
dc.contributor.author Chitu, Livia
dc.contributor.author Bodner, Sabine
dc.contributor.author Maier, Guenther
dc.contributor.author Šlouf, Miroslav
dc.contributor.author Koutný, Marek
dc.relation.ispartof Waste Management
dc.identifier.issn 0956-053X Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2015
utb.relation.volume 42
dc.citation.spage 31
dc.citation.epage 40
dc.type article
dc.language.iso en
dc.publisher Pergamon Elsevier Science Ltd.
dc.identifier.doi 10.1016/j.wasman.2015.04.006
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0956053X15002780
dc.subject Composting en
dc.subject Biodegradability en
dc.subject Polylactic acid en
dc.subject Layered silicates en
dc.subject Abiotic hydrolysis en
dc.subject Biodegradation kinetics en
dc.description.abstract The degradation mechanism and kinetics of polylactic acid (PLA) nanocomposite films, containing various commercially available native or organo-modified montmorillonites (MMT) prepared by melt blending, were studied under composting conditions in thermophilic phase of process and during abiotic hydrolysis and compared to the pure polymer. Described first order kinetic models were applied on the data from individual experiments by using non-linear regression procedures to calculate parameters characterizing aerobic composting and abiotic hydrolysis, such as carbon mineralization, hydrolysis rate constants and the length of lag phase. The study showed that the addition of nanoclay enhanced the biodegradation of PLA nanocomposites under composting conditions, when compared with pure PLA, particularly by shortening the lag phase at the beginning of the process. Whereas the lag phase of pure PLA was observed within 27 days, the onset of CO2 evolution for PLA with native MMT was detected after just 20 days, and from 13 to 16 days for PLA with organo-modified MMT. Similarly, the hydrolysis rate constants determined tended to be higher for PLA with organo-modified MMT, particularly for the sample PLA-10A with fastest degradation, in comparison with pure PLA. The acceleration of chain scission in PLA with nanoclays was confirmed by determining the resultant rate constants for the hydrolytical chain scission. The critical molecular weight for the hydrolysis of PLA was observed to be higher than the critical molecular weight for onset of PLA mineralization, suggesting that PLA chains must be further shortened so as to be assimilated by microorganisms. In conclusion, MMT fillers do not represent an obstacle to acceptance of the investigated materials in composting facilities. (C) 2015 Elsevier Ltd. All rights reserved. en
utb.faculty University Institute
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1005254
utb.identifier.rivid RIV/70883521:28610/15:43873022!RIV16-MSM-28610___
utb.identifier.obdid 43873442
utb.identifier.scopus 2-s2.0-84983095728
utb.identifier.wok 000357348500006
utb.identifier.pubmed 25981155
utb.identifier.coden WAMAE
utb.source j-wok
dc.date.accessioned 2015-08-14T09:26:22Z
dc.date.available 2015-08-14T09:26:22Z
dc.description.sponsorship European Regional Development Fund (ERDF); national budget of the Czech Republic [CZ.1.05/2.1.00/03.0111]; Ministry of Education, Youth and Sports of the Czech Republic [LE12002]; [IGA/FT/2014/005]
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Stloukal, Petr
utb.contributor.internalauthor Pekařová, Silvie
utb.contributor.internalauthor Kalendová, Alena
utb.contributor.internalauthor Koutný, Marek
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