title: Structural and water-repellent properties of a urea/poly(dimethylsiloxane) sol-gel hybrid and its bonding to cotton fabric.
abstract: A novel diureapropyltriethoxysilane [bis(aminopropyl)-terminated-poly(dimethylsiloxane) (1000)] (PDMSU) sol-gel hybrid was synthesized and applied on cotton to make it water repellent. Surface-energy values of PDMSU deposited on an aluminum substrate were determined, and the contact angle for water was assessed for impregnated cotton fabrics. The stability of the coatings was determined by repetitive washing, and their degradation was investigated with the help of the infrared attenuated total reflection (ATR) technique. The structure of PDMSU was studied by ATR and 29Si NMR spectroscopy. The results showed the active role of the urea groups in PDMSU/cotton interface bonding, but washing led to the relaxation of the urea-urea associations, as inferred from the appearance of a new amide II band at 1541 cm(-1).
authors.affiliation: National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia.
authors.forename: Jelica
authors.initials: J
authors.lastname: Vince
authors.forename: Boris
authors.initials: B
authors.lastname: Orel
authors.forename: Aljaz
authors.initials: A
authors.lastname: Vilcnik
authors.forename: Mojca
authors.initials: M
authors.lastname: Fir
authors.forename: Angela
authors.initials: A
authors.lastname: Surca Vuk
authors.forename: Vasko
authors.initials: V
authors.lastname: Jovanovski
authors.forename: Barbara
authors.initials: B
authors.lastname: Simoncic
mesh_terms: D001665:Binding Sites; D032561:Cotton Fiber; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D015394:Molecular Structure; D011437:Propylamines / Q000138:chemical synthesis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D012828:Silicones / Q000737:chemistry*; D012833:Siloxanes / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods; D013499:Surface Properties; D014508:Urea / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D004129:Dimethylpolysiloxanes; D005782:Gels; D011437:Propylamines; D012828:Silicones; D012833:Siloxanes; C521899:diureapropyltriethoxysilane(bis(aminopropyl)-)-terminated-poly(dimethylsiloxane); D014867:Water; C013830:baysilon; D014508:Urea