Facile Preparation Route for Thermosensitive Organo Silica Particles

초록

Trimethoxy(octadecyl)silane (OTS) based particle and their composite particles with vinyltrimethoxysilane (VTMS) or tetraethyl-orthosilicate (TEOS) were synthesized using a alcohol solvent under basic condition. The result of XRD, applying Bragg`s Law, gives d spacing of 4.1 ?, which would be a quite close to lamellar layer structure. The major weight losses of OTS based particles under N2 atmosphere occurred between 400 and 600 degrees, due to the decomposition of octadecyl group, while those of same particles in air was observed between 200 ℃ and 600 ℃, giving the residual yield of 18 %. The DSC profile of OTS based particle showed the melting temperature around at 58 degrees, while the melting point of OTS/VTMS composite particle was about 10 degrees lower than that of OTS based particles. In the other hand, the melting point of OTS/TEOS composite particle could not be found. The morphological property of resulting particles was characterized by the transmission electron microscopy (TEM) and the field emission scanning electron microscopy (FE-SEM).