Abstract
The influence of ultraviolet (UV) irradiation on vinylsilsesquioxane (ViSiO3/2) films was investigated using a nanoindentation technique, and the structural changes were analyzed. Solid-state 13C cross-polarization magic-angle-spinning nuclear magnetic resonance and infrared spectra of the films confirmed the polymerization of C=C bonds and formation of a C–C bridge structure upon UV irradiation. Since the vinyl group is a photosensitive organic component with a short organic chain, it is expected to show a large improvement in mechanical properties as a result of the formation of an organic network under the influence of UV irradiation. It is shown that varying the intensity of the UV irradiation leads to changes in the hardness and elasticity. The irradiation energy was found to determine the mechanical properties of the ViSiO3/2 films, regardless of the effects of different UV intensities on the hybrid films.
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