Abstract
A high refractive index alkoxysilane \( \left( {{\text{n}}_{\text{D}}^{ 2 5} = 1.512} \right) \), N-3-(trimethoxysilylpropyl)-phthalimide, was successfully synthesized by the substitution reaction of phthalimide potassium and γ-chloropropyltrimethoxysilane and characterized by GC, FT-IR, 1H-NMR and 13C-NMR. MT siloxane oligomers, which represent a broad range of hydrolytic condensation products of monofunctionalsilane (M) and trifunctionalsilane (T), were prepared by the reaction of the N-3-(trimethoxysilylpropyl)-phthalimide with hexamethyldisiloxane (MM) or divinyltetramethyldisiloxane (MViMVi) in the presence of HCl. The prepared MT siloxane oligomers were also characterized by 1H-NMR, 13C-NMR, FT-IR and GPC. All the obtained colorless and transparent oligomers have higher refractive indexes, which can be adjusted to as high as 1.547 by simply varying the ratio of M and T units in the oligomers such as for the MViTR siloxane oligomer.
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The financial support from the National Science Foundation of China (20844005) is greatly appreciated.
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Cai, H., Zhang, L., Xiong, Y. et al. Synthesis and Characterization of High Refractive Index MT Siloxane Oligomers. J Inorg Organomet Polym 24, 780–785 (2014). https://doi.org/10.1007/s10904-014-0039-7
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DOI: https://doi.org/10.1007/s10904-014-0039-7