title: Surface and blood-contacting properties of alkylsiloxane monolayers supported on silicone rubber.
abstract: Self-assembled monolayers of alkylsiloxanes supported on polydimethyl siloxane (PDMS) rubber were used as model systems to study the relation between blood compatibility and surface chemistry. The inner lumen of PDMS tubes was first treated with an oxygen plasma. The resultant oxidized surfaces were postderivatized by reacting them with alkyltrichlorosilanes to form the monolayer films. The chemical properties of the monolayers were controlled by varying the head-group chemical compositions. Surface derivatization was verified using variable-angle X-ray photoelectron spectroscopy (XPS or ESCA). Blood compatibility was evaluated using a canine ex vivo arteriovenous series shunt model. Surfaces grafted with hydrophobic head-groups as -CH3 and -CF3 had significantly lower platelet and fibrinogen deposition than the surfaces composed of hydrophilic groups such as -CO2CH3, -(CH2CH2O)3COCH3, and -(OCH2CH2)3OH.
authors.affiliation: Department of Chemical Engineering, University of Wisconsin, Madison 53706, USA.
authors.forename: J H
authors.initials: JH
authors.lastname: Silver
authors.forename: R W
authors.initials: RW
authors.lastname: Hergenrother
authors.forename: J C
authors.initials: JC
authors.lastname: Lin
authors.forename: F
authors.initials: F
authors.lastname: Lim
authors.forename: H B
authors.initials: HB
authors.lastname: Lin
authors.forename: T
authors.initials: T
authors.lastname: Okada
authors.forename: M K
authors.initials: MK
authors.lastname: Chaudhury
authors.forename: S L
authors.initials: SL
authors.lastname: Cooper
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D001769:Blood; D001777:Blood Coagulation; D004129:Dimethylpolysiloxanes; D004285:Dogs; D004577:Electron Probe Microanalysis; D005340:Fibrinogen / Q000378:metabolism; D010973:Platelet Adhesiveness; D012821:Silanes; D012828:Silicones; D013499:Surface Properties
chemical_list: D001672:Biocompatible Materials; D004129:Dimethylpolysiloxanes; D012821:Silanes; D012828:Silicones; C013830:baysilon; D005340:Fibrinogen