Development of Amphiphilic, Siloxane-Based Fouling-Release Coatings
Abstract
ABSTRACT With this one year extension grant, the proposal team will conduct research and development in the following areas: 1. Amphiphilic polysiloxanes (AmphiSil) – Coatings based on this approach have shown excellent fouling-release (FR) properties both in laboratory and field testing evaluations. The only commercial impediment associated with this technology is the cost of a fluorocontaining siloxane that is critical to obtaining the excellent FR properties. For the proposed project, siloxane oligomers possessing both fluorine-containing moieties and poly(ethylene glycol) (PEG) chains will be incorporated into the same oligomer using sol-gel chemistry. By incorporating fluorine components and PEG moieties into the same oligomer, it is believed that diffusion of PEG chains to the coating/air interface will be facilitated, due to the presence of the low surface energy fluorine moieties. As a result, this method may enable more efficient use of the fluoro component such that less of it is required to obtain excellent FR performance. Thus, this approach may enable a lower cost and/or better performing AmphiSil-type coating. 2. FR coatings derived from amphiphilic, fluorine-free poly(vinyl ether) polymers – Coatings based on the amphiphilic poly(vinyl ether) polymers possessing polydimethylsiloxane (PDMS) grafts and PEG grafts have shown very good to excellent FR properties depending on composition. To further this technology, a series of polymers will be produced that vary with respect both PDMS content and PEG content. In addition, crosslink density will be varied by changing the concentration of the hydride crosslinker. Coating solutions will be cast into 24-well plates and 12 element miniature arrays for FR assays using marine microorganisms and adult barnacles, respectively. The FR properties will be determined in-house using high-throughput assays. Coatings exhibiting exceptional FR properties will be scaled-up for ocean immersion testing. 3. Comprehensive, biological laboratory testing for ONR principal investigators – In addition to testing the FR properties of coatings produced by the proposal team, the team will utilize its’ unique high-throughput biological assays and expertise to access the FR and antifouling properties of coating technologies being investigated and developed by other researchers involved in the ONR Biofouling Program.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512323
Entities
People
- Bret Chisholm
Organizations
- North Dakota State University
- Office of Naval Research
- United States Navy