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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F15%3A00446050" target="_blank" >RIV/61389013:_____/15:00446050 - isvavai.cz</a>

Alternative codes found

RIV/70883521:28610/15:43873022 RIV/70883521:28110/15:43873022

Result on the web

<a href="http://dx.doi.org/10.1016/j.wasman.2015.04.006" target="_blank" >http://dx.doi.org/10.1016/j.wasman.2015.04.006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.wasman.2015.04.006" target="_blank" >10.1016/j.wasman.2015.04.006</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JI - Composite materials

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Waste Management

ISSN

0956-053X

e-ISSN

—

Volume of the periodical

42

Issue of the periodical within the volume

August

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

31-40

UT code for WoS article

000357348500006

EID of the result in the Scopus database

2-s2.0-84952638984