Melt viscoelastic assessment of Poly(Lactic Acid) composting: Influence of UV Ageing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F18%3A63520469" target="_blank" >RIV/70883521:28110/18:63520469 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1420-3049/23/10/2682" target="_blank" >https://www.mdpi.com/1420-3049/23/10/2682</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/molecules23102682" target="_blank" >10.3390/molecules23102682</a>

Result language

angličtina

Original language name

Melt viscoelastic assessment of Poly(Lactic Acid) composting: Influence of UV Ageing

Original language description

This study is devoted to the degradation pathway (bio, photo degradation and photo/bio) of Poly(Lactic acid) PLA polymers by means of melt viscoelasticity. A comparison was made between three PLA polymers with different microstructures (L, D stereoisomers). Biodegradability was determined during composting by burying the polymer films in compost at 58 _C. Melt viscoelasticity was used to assess the molecular evolution of the materials during the composting process. Viscoelastic data were plotted in the complex plane. We used this methodology to check the kinetics of the molecular weight decrease during the initial stages of the degradation, through the evolution of Newtonian viscosity. After a few days in compost, the Newtonian viscosity decreased sharply, meaning that macromolecular chain scissions began at the beginning of the experiments. However, a double molar mass distribution was also observed on Cole-Cole plots, indicating that there is also a chain recombination mechanism competing with the chain scission mechanism. PLA hydrolysis was observed by infra-red spectroscopy, where acid characteristic peaks appeared and became more intense during experiments, confirming hydrolytic activity during the first step of biodegradation. During UV ageing, polymer materials undergo a deep molecular evolution. After photo-degradation, lower viscosities were measured during biodegradation, but no significant differences in composting were found.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2018

Confidentiality

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

Name of the periodical

Molecules

ISSN

1420-3049

e-ISSN

—

Volume of the periodical

23

Issue of the periodical within the volume

10

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

—

UT code for WoS article

000451201400277

EID of the result in the Scopus database

2-s2.0-85055078641