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Published in: Cellulose 11/2020

Open Access 14-05-2020 | Original Research

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

Authors: Jure Žigon, Janez Kovač, Rok Zaplotnik, Jaša Saražin, Milan Šernek, Marko Petrič, Sebastian Dahle

Published in: Cellulose | Issue 11/2020

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Abstract

Combinations of wood and metal are interesting hybrid composite materials, joining together the low density of wood with the stiffness and strength of metals. Different types of adhesives are used to connect wood and metal elements, but the compatibility between adhesives used and load-bearing materials must be sufficient, which often is challenging. In adhesive bonding technology, surface treatments are a crucial step in the process. In this study, an atmospheric plasma discharge was employed to enhance the adhesion strength of joints between common beech (Fagus sylvatica L.) wood, metals (steel and aluminum alloy), and four different types of adhesives. The optical properties of plasma discharges and its influence on treated substrates’ surface morphology depended on the inherent properties of the treated materials. X-ray photoelectron spectroscopy revealed the surface oxidation of all the materials after plasma treatment. Consequently, the surface free energy of all materials increased as well. The positive effect of the plasma treatment on the tensile shear strength of single-lap joints shows a high potential of atmospheric plasma treatment technology for enhancement of adhesives strength of joints combining wooden elements, wood and steel, or wood and aluminum alloys. In addition to that, expensive epoxy and polyurethane adhesives could be replaced by more affordable polyvinyl acetate and melamine-urea-formaldehyde adhesives, and still perform at equal levels if the plasma was applied prior to bonding.

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Metadata
Title
Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment
Authors
Jure Žigon
Janez Kovač
Rok Zaplotnik
Jaša Saražin
Milan Šernek
Marko Petrič
Sebastian Dahle
Publication date
14-05-2020
Publisher
Springer Netherlands
Published in
Cellulose / Issue 11/2020
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-020-03212-8

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