The use of low-pressure plasma on enhancing the attachment of Al2O3 nanoparticles to wood–plastic composites

Authors: Gonzalez de Cademartori, Pedro Henrique; Souza Junior, Luiz Roberto; Blanchet, Pierre; Esteves Magalhães, Washington Luiz; Bolzon de Muniz, Graciela Ines
Abstract: Wood–plastic composites (WPC) are widely used for many purposes due to their interesting properties, but they have poor surface adhesion due to the chemical inertness of the matrix. Thus, in this work, the effect of plasma treatment on the WPC was investigated regarding its influence in the aluminum oxide (Al2O3) nanoparticles attachment to the surface. WPC were prepared in a polypropylene (PP) matrix, plasma-treated at 100 W for 600 s, and then covered with Al2O3 nanoparticles dispersion. The WPC/Al2O3 surfaces have been investigated by means of morphology, surface roughness, chemical structure, wettability, and nanohardness. Plasma treatment improved the attachment of Al2O3 onto WPC, which was confirmed by the higher presence of aluminum and oxygen-containing functional groups and the reduction of the intensity of peaks of methylene (CH2) and methyl (CH3) groups on the WPC surface. The higher surface reactivity of plasma-treated WPC resulted in a better distribution of the nanoparticles over the entire surface. In addition, plasma treatment avoided the formation of coffee-ring phenomenon but it was able to create cone-like structures on the WPC, increasing the surface roughness due to the etching effect and the attachment of Al2O3 nanoparticles. Plasma treatment followed by Al2O3 nanoparticles attachment increased the wettability, hardness, and elastic modulus of WPC at nanometric scale.
Document Type: Article de recherche
Issue Date: 12 February 2018
Open Access Date: Restricted access
Document version: VoR
Permalink: http://hdl.handle.net/20.500.11794/17561
This document was published in: Journal of wood chemistry and technology, Vol. 398 (2), 71-83 (2018)
https://doi.org/10.1080/02773813.2017.1372477
Alternative version: 10.1080/02773813.2017.1372477
Collection:Articles publiés dans des revues avec comité de lecture

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