title: Detection of tethered biocide moiety segregation to silicone surface using sum frequency generation vibrational spectroscopy.
abstract: Polymer surface properties are controlled by the molecular surface structures. Sum frequency generation (SFG) vibrational spectroscopy has been demonstrated to be a powerful technique to study polymer surface structures at the molecular level in different chemical environments. In this research, SFG has been used to study the surface segregation of biocide moieties derived from triclosan (TCS) and tetradecyldimethyl (3-trimethoxysilylpropyl) ammonium chloride (C-14 QAS) that have been covalently bound to a poly(dimethylsiloxane) (PDMS) matrix. PDMS materials are being developed as coatings to control biofouling. This SFG study indicated that TCS-moieties segregate to the surface when the bulk concentration of TCS-moieties exceeds 8.75% by weight. Surface segregation of C-14 QAS moieties was detected after 5% by weight incorporation into a PDMS matrix. SFG results were found to correlate well with antifouling activity, providing a molecular interpretation of such results. This research showed that SFG can aid in the development of coatings for controlling biofouling by elucidating the chemical structure of the coating surface.
authors.affiliation: Department of Chemistry and Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Shuji
authors.initials: S
authors.lastname: Ye
authors.forename: Arthur
authors.initials: A
authors.lastname: McClelland
authors.forename: Partha
authors.initials: P
authors.lastname: Majumdar
authors.forename: Shane J
authors.initials: SJ
authors.lastname: Stafslien
authors.forename: Justin
authors.initials: J
authors.lastname: Daniels
authors.forename: Bret
authors.initials: B
authors.lastname: Chisholm
authors.forename: Zhan
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000643:Ammonium Chloride / Q000737:chemistry; D001419:Bacteria / Q000378:metabolism; D001672:Biocompatible Materials / Q000737:chemistry; D018441:Biofilms; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004202:Disinfectants / Q000494:pharmacology*; D056890:Eukaryota / Q000378:metabolism; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry; D012828:Silicones / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis / Q000379:methods*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D004129:Dimethylpolysiloxanes; D004202:Disinfectants; D011108:Polymers; D012828:Silicones; D000643:Ammonium Chloride; D014867:Water; C013830:baysilon