Transparent Organic-Inorganic Hybrids Obtained from Covalently Bonded Ureasilicate Monomers: Optical and Mechanical Properties

摘要

Flexible optically clear ureasil monoliths were synthesized by hydrolysis and condensation of two hybrid organic-inorganic ureasilicate monomers (precursors) with different lengths of the polymer segments. The monomer with a longer polymer chain length was obtained by reaction of 1 mol of silicon modified alkoxyde (ICPTES) and 2 mol of double terminated polyetheramine (Jeffamine), and that with a shorter length by reaction of 1 mol of ICPTES and 1 mol of 3-aminopropyl triethoxysilane (APTES), which provides stoichiometric ratio between the initial ingredients. The obtained materials were characterized by optical UV-VIS spectroscopy and depth-sensing indentation method (DSI). The influence of the molar ratio between the ureasilicate monomers on the optical and mechanical properties of the samples was investigated.