Structural and water-repellent properties of a urea/poly(dimethylsiloxane) sol-gel hybrid and its bonding to cotton fabric.
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).
Vince
Jelica
J
National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia.
Orel
Boris
B
Vilcnik
Aljaz
A
Fir
Mojca
M
Surca Vuk
Angela
A
Jovanovski
Vasko
V
Simoncic
Barbara
B
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
D004129:Dimethylpolysiloxanes; D005782:Gels; D011437:Propylamines; D012828:Silicones; D012833:Siloxanes; C521899:diureapropyltriethoxysilane(bis(aminopropyl)-)-terminated-poly(dimethylsiloxane); D014867:Water; C013830:baysilon; D014508:Urea