engleski

Modification of polyurethane-coated fabrics by sol-gel thin films

Sol-gel derived silica and hybrid films from tetraethoxysilane (TEOS) and 3-glycidyloxypropyltrimethoxysilane (GLYMO) were deposited by dip-coating, in order to find the best treatment. GLYMO-based treatments preserved textile feel of the material. The coatings were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and water contact angle measurement. IR spectra confirmed the existence of silicate network and successfully conducted modification for both precursors. DSC and TGA showed that the conditions of hydrolysis had greater influence on TEOS than GLYMO-based treatments. Both treatments shifted the degradation onset to higher temperatures. SEM images showed that polyurethane surface and pores were completely covered and filled by silica or hybrid thin films forming a composite organic-inorganic coating. Hydrophobic effect was preserved for all the samples, except for a single treatment of the GLYMO, due to its polar epoxy group.

modification ; polyurethanes ; coatings ; thin films ; silicas

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