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Synthesis and characterization of poly(silyl urethane)s derived from glycol-modified silanes



Hybrid composites are a class of material that have gained substantial recognition due to their highly sought-after properties of both organics and inorganics. A novel method for incorporating inorganic content into urethane materials is through the use of organically modified silicate cross-linkers. Glycol-modified silanes, in particular, allow for the facile preparation of highly cross-linked urethane materials with a wide range of bulk and surface characteristics including glass transition temperature (−40.4–85.6°C), storage modulus (0.7–1.62 GPa), and surface energy (19.0–62.4 dynes cm−1). Importantly, control of the overall polymer properties remains achievable via the structural control of macrodiols and isocyanates. Additionally, incorporation of silicate cross-linkers into urethane systems provides these materials with a hydrolyzable character, which may be controlled by altering the bulk polymer composition, cross-link density, and surface energy. The unique nature of these systems also allows for the preparation of highly cross-linked urethanes in the absence of any heavy metal catalysts and depending on the composition, with the use of little to no solvent. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013