Method of controlling the ratio of functional groups in POSS with one-step reaction.

초록

Academia that has insisted on the unique characteristics of each material such as metals, ceramics, and organics has recently focused on organic-inorganic hybrid materials to compensate for the weakness of each material. The most critical point of the design of organic-inorganic hybrid materials is the compatibility between organic and inorganic polymers. In this respect, silsesquioxane has attracted wide-spread attention as a material that can meet this scientific need. Silsesquioxane refers to all structures with the empirical formula RSiO3/2 in siloxane composed of Si-O-Si bonds.1 silsesquioxane are divided into random, ladder and cage types according to their structure, among which the material we are interested in is Polyhedral Oligomeric silsesquioxane(POSS), the silsesquioxane of the cage structure. POSS has a dense structure that average diameter is 0.5 nm, which is chemically and thermally stable and can introduce various organic substituents on the outside.2 Many studies have been performed to insert whole functional groups into silsesquioxane or to substitute only one functional group. However, substituting more than two functional groups or controlling the number of internal functional groups has rarely been studied. Multi-steps of synthesis have performed only a few cases of studies under harsh conditions.3 In this study, we suggest a new synthetic route for controlling the functional group of POSS by a one-pot reaction. We prepared methyl-vinyl POSS from trimethoxymethyl silane(MTMS) and trimethoxyvinyl silane(VTMS), which can be controlled methyl/vinyl ratio by one-pot synthesized. Characterization was performed in terms of FT-IR, NMR, TGA, IR.