Preparation of carboxylate group-containing rod-like polysilsesquioxane with hexagonally stacked structure by sol-gel reaction of 2-cyanoethyltriethoxysilane

作者：Toyodome Hisaya; Kaneko Yoshiro^*; Shikinaka Kazuhiro; Iyi Nobuo

来源：Polymer, 2012, 53(26): 6021-6026.

DOI：10.1016/j.polymer.2012.10.052

• Hexagonally stacked structure
• Polysilsesquioxane
• Sol-gel reaction

Carboxylate group-containing rod-like polysilsesquioxane (PSQ-COO-Na+) with a hexagonally stacked structure was successfully prepared by the sol gel reaction (hydrolytic polycondensation) of 2-cyanoethyltriethoxysilane (CETEOS) monomer in sodium hydroxide aqueous solution. The X-ray diffraction pattern of the cast film of PSQ-COO-Na+ showed three diffraction peaks with the d-value ratio of 1 : 1/root 3 : 1/2, indicating the formation of hexagonal phase. In addition, the transmission electron microscopic image of PSQ-COO-Na+ showed a stripe pattern, indicating that the rod-like PSQs were stacked parallel. Self-organization of an ion pair composed of a carboxylate anion and a sodium cation, which was converted from the cyano group of CETEOS by hydrolysis under alkaline conditions, was a driving force for the formation of such regular higher-ordered structures of PSQ-COO-Na+.

• 出版日期2012-12-7