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Photo initiated chemical vapour deposition to increase polymer hydrophobicity

Ariane Bérard, Gregory Scott Patience, Gérald Chouinard and Jason Robert Tavares

Article (2016)

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Abstract

Apple growers face new challenges to produce organic apples and now many cover orchards with high-density polyethylene (HDPE) nets to exclude insects, rather than spraying insecticides. However, rainwater- associated wetness favours the development of apple scabs, Venturia inaequalis, whose lesions accumulate on the leaves and fruit causing unsightly spots. Treating the nets with a superhydrophobic coating should reduce the amount of water that passes through the net. Here we treat HDPE and polyethylene terephthalate using photo-initiated chemical vapour deposition (PICVD). We placed polymer samples in a quartz tube and passed a mixture of H2 and CO through it while a UVC lamp (254 nm) illuminated the surface. After the treatment, the contact angle between water droplets and the surface increased by an average of 20°. The contact angle of samples placed 70 cm from the entrance of the tube was higher than those at 45 cm and 20 cm. The PICVD-treated HDPE achieved a contact angle of 124°. Nets spray coated with a solvent-based commercial product achieved 180° but water ingress was, surprisingly, higher than that for nets with a lower contact angle.

Subjects: 1800 Chemical engineering > 1800 Chemical engineering
2000 Materials science and technology > 2004 Polymers and coatings
Department: Department of Chemical Engineering
PolyPublie URL: https://publications.polymtl.ca/2784/
Journal Title: Scientific Reports (vol. 6, no. 1)
Publisher: Nature
DOI: 10.1038/srep31574
Official URL: https://doi.org/10.1038/srep31574
Date Deposited: 03 Oct 2017 14:43
Last Modified: 27 May 2024 12:12
Cite in APA 7: Bérard, A., Patience, G. S., Chouinard, G., & Tavares, J. R. (2016). Photo initiated chemical vapour deposition to increase polymer hydrophobicity. Scientific Reports, 6(1). https://doi.org/10.1038/srep31574

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