Functionalisation of cotton with hydrophobic urea/polydimethylsiloxane sol-gel hybrid (original) (raw)

Acta Chimica Slovenica

Abstract

A novel organic-inorganic sol-gel hybrid precursor, di-ureapropyltriethoxysilyl [bis aminopropyl)terminated-polydimethylsiloxane (1000)| (PDMSU), was synthesized and tested as a hydrophobic impregnation for cotton fabrics. Hydrolysis of the precursor was performed with 0.1 mol L -1 HCl and for deposition 4% sols of PDMSU in EtOH were used. Contact angle measurements revealed the hydrophobicity of the coating, either on Al substrate (⊖ > 100°) or on cotton (⊖ ∼ 130°). IR attenuated total reflection (ATR) spectroscopy showed that urea groups participate in PDMSU/cotton interface bonding. while free urea groups (1725, 1691 cm were noted in the spectra of PDMSU/Al and PDMSU/xerogel samples. The stability of the coatings was determined by repetitive washing. Degradation of the coatings was evidenced from the decrease in contact angle values and the relaxation of the urea-urea associations, leading to the appearance of the new Amide II band (1541 cm -1 ) in the IR ATR spectra.

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