Synthesis of polytitanosiloxanes and their transformation to SiO2–TiO2 ceramic fibers

Abstract

AbstractA one‐pot synthesis of polytitanosiloxanes (PTS) and its transformation to SiO2–TiO2 ceramic fibers were investigated. PTS was prepared by the hydrolysis of tetraethoxysilane followed by the reaction with bis(2,4‐pentanedionato)titanium diisopropoxide in methanol in 33–95 SiO2 mol %. PTS was considered to be a ladder‐ or sheet‐type polymer consisting of SiOSi and SiOTi linkages as a main chain with pendant hydroxyl and 2,4‐pentanedionato groups. SiO–TiO ceramic fibers were prepared by the pyrolysis of SiO2–TiO2 precursor fibers, which were prepared by the dry spinning of PTS followed by steam treatment. The tensile strength was 610 MPa for the SiO2–TiO2 fibers (SiO2/TiO2 = 20) after the pyrolysis at 7000C. © 1994 John Wiley & Sons, Inc.