A1 Journal article (refereed), original research

Optimizing electric corona treatment for hydroxypropylated starch-based coatings


Publication Details
Authors: Lyytikäinen Johanna, Ovaska Sami-Seppo, Soboleva Ekaterina, Rinkunas Ringaudas, Lozovski Tadeus, Maldzius Robertas, Sidaravicius Jonas, Johansson Leena-Sisko, Backfolk Kaj
Publisher: Elsevier
Publication year: 2018
Language: English
Related Journal or Series Information: Carbohydrate Polymers
ISSN: 0144-8617
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication

Abstract

The aim of this investigation was to determine the role of negative direct current and alternating current (plasma) corona treatments in modification of bio-based dispersion barrier coatings and the response of replacing fossil-based binder with a thermoplastic bio-based binder (starch). The study emphasizes the importance of understanding and optimizing electric corona discharge in order to obtain high oxidation level without harming the substrate and causing unintentional treatment of the reverse side. The coatings were exposed to different corona treatment conditions using a novel developed sheet-fed laboratory-scale device. Corona-induced topographical, mechanical and surface chemical changes were observed from atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and contact angle and surface energy measurements. XPS results indicated further that partial starch decomposition occurred after plasma treatment. Coated surfaces became substantially smoother after both treatments suggesting that nanoparticle migration and re-orientation effects occurred. Additionally, reverse side effects and strike through were also discussed.


Last updated on 2019-13-03 at 12:00