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Green and scalable processing of water‐soluble, biodegradable polymer/clay barrier films

Title data

Röhrl, Maximilian ; Timmins, Renee ; Ghosh, Dipannita ; Schuchardt, Dominik ; Rosenfeldt, Sabine ; Nürmberger, Simon ; Bölz, Uwe ; Agarwal, Seema ; Breu, Josef:
Green and scalable processing of water‐soluble, biodegradable polymer/clay barrier films.
In: Journal of Applied Polymer Science. Vol. 140 (2023) Issue 37 . - e54418.
ISSN 1097-4628
DOI: https://doi.org/10.1002/app.54418

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
SFB 1357 Mikroplastik
391977956

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Poly(vinyl alcohol) (PVOH) based water-soluble packaging with intentional disposal into wastewater provides great convenience for both households and industry. In this paper, we demonstrate with CO2 evolution testing that only insignificant fractions (~2%) of PVOH biodegrade in wastewater within 33 days. To avoid unintentional environmental build-up and the accompanying consequences to marine life, alternative materials with a suitable balance of performance and biodegradability are needed. Until now, the barrier properties of biodegradable biopolymers could not compete with state-of-the-art water-soluble packaging materials like PVOH films. In this paper, we report on waterborne, sandwich-structured films using hydroxypropyl methylcellulose or alginate produced with an industrially scalable slot-die coater system. The inner layer of the film consists of a collapsed nematic suspension of high aspect ratio synthetic clay nanosheets that act as an impermeable wall. Such a film structure not only allows for barrier filler loadings capable of sufficiently reducing oxygen and water vapor permeability of alginate to 0.063 cm3 mm m−2 day−1 bar−1 and 53.8 g mm m−2 day−1 bar−1, respectively, but also provides mechanical reinforcement to the biopolymer films facilitating scalable processing. Moreover, the films disintegrated in water in less than 6 min while rapid biodegradation of the dissolved polymer was observed.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: biodegradable and water-soluble packaging; microplastic; oxygen and water vapor barrier; slot die coating; sustainability
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Research Institutions > Collaborative Research Centers, Research Unit > SFB 1357 - MIKROPLASTIK
Research Institutions > EU Research Projects > LIMNOPLAST - Microplastics In Europe’s Freshwater Ecosystems: from sources to solutions
Faculties
Research Institutions
Research Institutions > Affiliated Institutes
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > EU Research Projects
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
Date Deposited: 21 Jul 2023 06:59
Last Modified: 13 Oct 2023 07:11
URI: https://eref.uni-bayreuth.de/id/eprint/86248