Fouling-release coatings prepared from alpha,omega-dihydroxypoly(dimethylsiloxane) cross-linked with (heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane.
Surface properties of pristine and water-aged polymeric films made of alpha,omega-dihydroxypoly(dimethylsiloxane) (PDMS) cross-linked with (heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane (FTEOS17) or tetraethoxysilane (TEOS) were investigated. The FTEOS17-cured coatings showed stable advancing and receding contact angles over a period of 3 months of water exposure, compared to a 70 degrees decrease in receding contact angle for the TEOS-cured coatings. After immersion in water, hydroxyl groups were detected on the TEOS-cured coatings with attenuated total reflection infrared spectroscopy (ATR-FT/IR). Tapping-mode atomic force microscopy (TM-AFM) on pristine FTEOS17-cured coatings showed surfaces topologies ranging from smooth and featureless to topologically complex, depending on FTEOS17 concentration. The fluorinated coatings showed a stable surface morphology after water immersion, which we believe is due to the formation of a fluorinated siliceous phase that prevented the surface reconstruction, water penetration, and hydrolysis. The smooth pristine TEOS-cured coatings showed an increased roughness with cracks and erosion pits present on the surface after water immersion.
Berglin
Mattias
M
Biopolymer Technology, Department of Polymer Technology, Chalmers University of Technology, Göteborg SE-412 96, Sweden.
Wynne
Kenneth J
KJ
Gatenholm
Paul
P
D003432:Cross-Linking Reagents / Q000737:chemistry; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D005465:Fluorocarbon Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010150:Paint; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013500:Surface Tension; D014867:Water / Q000737:chemistry
D003432:Cross-Linking Reagents; D004129:Dimethylpolysiloxanes; D005465:Fluorocarbon Polymers; D011108:Polymers; D012821:Silanes; D014867:Water; C040733:tetraethoxysilane