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

Jaleh Mansouri, Vi Khanh Truong, Shane MacLaughlin, David E. Mainwaring, Graeme Moad, Ian J. Dagley, Elena P. Ivanova, Russell J. Crawford, Vicki Chen

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
24 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number1610
Number of pages19
JournalNanomaterials
Volume9
Issue number11
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Bibliographical note

Funding Information:
Funding: The authors thank the Cooperative Research Centre for Polymers (CRCP) and BlueScope Steel for their support of this research.

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Antibacterial
  • Cleanability
  • Dynamic nano-topography
  • Polyester coatings
  • Siloxane copolymer additives
  • Surface segregation

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