Comparison of Crosslinking Efficiency in Dip and Roll-Deposited Coatings on Their Oxygen Barrier

Fatma Ben Dhieb; Seyed H Tabatabaei; Frej Mighri; Abdellah Ajji

doi:10.1021/acsomega.9b00950

Comparison of Crosslinking Efficiency in Dip and Roll-Deposited Coatings on Their Oxygen Barrier

ACS Omega. 2019 Sep 16;4(14):15772-15779. doi: 10.1021/acsomega.9b00950. eCollection 2019 Oct 1.

Authors

Fatma Ben Dhieb¹, Seyed H Tabatabaei², Frej Mighri³, Abdellah Ajji¹

Affiliations

¹ 3SPack NSERC-Industry Chair, CREPEC, Chemical Engineering Department, Polytechnique Montreal, C.P. 6079, Succursale Centre ville, Montreal, QC, Canada H3C 3A7.
² ProAmpac, Terrebonne, QC, Canada J6Y 1V2.
³ CREPEC, Chemical Engineering Department, Laval University, Quebec, QC, Canada G1V 0A6.

Abstract

Coating techniques are key factors in determining coated film properties. In the present study, nanocomposite coatings of poly(vinyl alcohol) and a nanoclay, montmorillonite, were deposited layer-by-layer using roll (doctor blade, DB) and dip coating techniques, in an effort to compare the impact of these techniques on the crosslinking efficiency and oxygen barrier of the coated films. The barrier properties at different relative humidities were tested, and the extent of nanoclay intercalation as well as the films' morphology was investigated. Barrier was further improved by crosslinking the coating with glyoxal and glutaraldehyde. Both techniques gave similar results but with a higher impact of relative humidity in roll coated films. Better results were achieved by tailoring the composition of those coatings to favor a higher density of hydrogen bonding in the coating.