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
| Autor: | David E. Mainwaring, Shane Maclaughlin, Elena P. Ivanova, Russell J. Crawford, Vi Khanh Truong, Jaleh Mansouri, Graeme Moad, Ian J. Dagley, Vicki Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Thermosetting polymer surface segregation engineering.material Article Polyester chemistry.chemical_compound cleanability antibacterial Coating chemistry Chemical engineering Polymerization siloxane copolymer additives Siloxane Phase (matter) Titanium dioxide engineering Copolymer General Materials Science dynamic nano-topography polyester coatings |
| Zdroj: | Nanomaterials Volume 9 Issue 11 |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano9111610 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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