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Open AccessArticle

Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties

1
UNESCO Centre for Membrane Science and Technology, School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
2
Cooperative Research Centre for Polymers, Notting Hill, VIC 3168, Australia
3
Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
4
Nanobiotechnology Laboratory, School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia
5
BlueScope Steel Research, Port Kembla, NSW 2505, Australia
6
CSIRO Manufacturing, Clayton, VIC 3168, Australia
7
Defence Science and Technology, Department of Defence, 506 Lorimer Street, Port Melbourne, VIC 3207, Australia
8
School of Chemical Engineering, University of Queensland, Brisbane, QLD 4072, Australia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1610; https://doi.org/10.3390/nano9111610
Received: 24 October 2019 / Revised: 7 November 2019 / Accepted: 11 November 2019 / Published: 13 November 2019
(This article belongs to the Special Issue Antibacterial Nanomaterials Coating: Fabrication and Applications)
In this work, we report on the incorporation of a siloxane copolymer additive, poly((2-phenylethyl) methylsiloxane)-co(1-phenylethyl) methylsiloxane)-co-dimethylsiloxane), which is fully soluble at room temperature, in a rapid-cure thermoset polyester coating formulation. The additive undergoes polymerization-induced phase segregation (PIPS) to self-assemble on the coating surface as discrete discoid nanofeatures during the resin cure process. Moreover, the copolymer facilitates surface co-segregation of titanium dioxide pigment microparticulate present in the coating. Depending on the composition, the coatings can display persistent superhydrophobicity and self-cleaning properties and, surprisingly, the titanium dioxide pigmented coatings that include the siloxane copolymer additive display high levels of antibacterial performance against Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) bacteria. This antibacterial performance is believed to be associated with the unique surface topology of these coatings, which comprise stimuli-responsive discoid nanofeatures. This paper provides details of the surface morphology of the coatings and how these relates to the antimicrobial properties of the coating. View Full-Text
Keywords: polyester coatings; siloxane copolymer additives; cleanability; antibacterial; surface segregation; dynamic nano-topography polyester coatings; siloxane copolymer additives; cleanability; antibacterial; surface segregation; dynamic nano-topography
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MDPI and ACS Style

Mansouri, J.; Truong, V.K.; MacLaughlin, S.; Mainwaring, D.E.; Moad, G.; Dagley, I.J.; Ivanova, E.P.; Crawford, R.J.; Chen, V. Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties. Nanomaterials 2019, 9, 1610. https://doi.org/10.3390/nano9111610

AMA Style

Mansouri J, Truong VK, MacLaughlin S, Mainwaring DE, Moad G, Dagley IJ, Ivanova EP, Crawford RJ, Chen V. Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties. Nanomaterials. 2019; 9(11):1610. https://doi.org/10.3390/nano9111610

Chicago/Turabian Style

Mansouri, Jaleh; Truong, Vi K.; MacLaughlin, Shane; Mainwaring, David E.; Moad, Graeme; Dagley, Ian J.; Ivanova, Elena P.; Crawford, Russell J.; Chen, Vicki. 2019. "Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties" Nanomaterials 9, no. 11: 1610. https://doi.org/10.3390/nano9111610

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