Abstract
A series of linear polyurethane (PU) aqueous dispersions modified by polyhedral oligomeric silsesquioxane (POSS) was synthesized by incorporating various amounts (ca. 2–10 wt%) of a secondary amino-terminated monofunctional POSS in hexamethylene diisocyanate trimer (HDI-T), hexamethylene diisocyanate, poly(tetramethylene-oxide) and 2,2-bis(hydroxymethyl)propionic acid. Results from the gel permeation chromatography, Fourier-transform infrared spectroscopy, transmission electron microscopy, and X-ray diffraction showed that the POSS monomers could be effectively introduced into the PU matrices based on HDI-T to obtain stable aqueous and homogenous PU/POSS hybrid dispersions. The thermal properties of the hybrids do not significantly affect the degradation mechanism of the PU. The physical properties of the PU/POSS hybrid films changed, with a notable increase in tensile strength and surface hydrophobicity.
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