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High Barrier Water-Based Polymer/Clay Nanocomposite Coating

Fatma Ben Dhieb

PhD thesis (2019)

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Cite this document: Ben Dhieb, F. (2019). High Barrier Water-Based Polymer/Clay Nanocomposite Coating (PhD thesis, Polytechnique Montréal). Retrieved from https://publications.polymtl.ca/4010/
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Abstract

Résumé: Face au besoin urgent de matériaux recyclables, il existe un intérêt croissant pour l’amélioration des emballages existants tels que les emballages multicouches. Cet emballage contient différentes couches de polymères, chacune répondant à un besoin différent, comme la barrière aux gaz, les propriétés mécaniques et la qualité du scellage. Pour assurer la barrière à l'oxygène, la couche barrière est généralement un polymère très peu perméable tel que l'alcool éthylène vinylique (EVOH) et le nylon. Cela présente toutefois des inconvénients tels que le coût et la non recyclabilité de l'emballage. Une alternative intéressante pour remplacer cette couche est l'utilisation d'un revêtement haute barrière. À cette fin, le revêtement nanocomposite a été étudié dans cette thèse. La Montmorillonite (MMT) a été choisie comme charge en raison de sa disponibilité et de son prix abordable. Afin de mieux comprendre l’effet des polymères sur les propriétés de l’argile dans un revêtement nanocomposite, quatre polymères ont été choisis pour étudier les revêtements à base de liaisons hydrogène ; l’oxyde de polyéthylène (PEO), le polyvinylpyrrolidone (PVP), le chitosane (CS) et l’alcool polyvinylique (PVA).----------Abstract: With the urgent need for recyclable materials, there’s a growing interest for the improvement of existing packaging like the multilayer packaging. This package has different layers of polymers, each one fulfilling a different need like gas barrier, mechanical properties and saleability. To ensure the barrier to oxygen, the barrier layer, is generally a high barrier polymer like ethylene vinyl alcohol (EVOH) and Nylon. This, however, has some drawbacks like the cost and the non recyclability of the package. One interesting alternative to replace this layer is the use of a high barrier coating. To this aim, a nanocomposite coating was the focus of this thesis. Montmorillonite (MMT) was chosen as the filler due to its availability and affordable price. To provide a deeper understanding of the effect of polymers on the properties of clay in a nanocomposite coating, four polymers were chosen to study hydrogen bonding based coatings; polyethylene oxide (PEO), polyvinylpyrrolidone (PVP), chitosan (CS), and polyvinyl alcohol (PVA). Using the Layer by Layer (LbL) deposition technique, two different structures, bilayer and quadlayer were investigated, which differ in the layers number of the repetitive unit (two and four respectively). For the bilayer structure, PVA, PEO and PVP were used with MMT while in the quadlayer structure, two layers of CS were added to the repetitive unit. The advantage of using these three polymers (PEO, PVP, PVA) is that their different structures as well as their different type of hydrogen bonding with MMT, allow an interesting comparison of their effect on clay properties and the nanocomposite permeability.

Open Access document in PolyPublie
Department: Département de génie chimique
Dissertation/thesis director: Abdellah Ajji, Frej Mighri and Hesamoddin Tabatabaei
Date Deposited: 18 Nov 2019 13:48
Last Modified: 12 Dec 2019 10:15
PolyPublie URL: https://publications.polymtl.ca/4010/

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