title: Structure of polyphenylsilsesquioxane particles prepared by two-step acid-base catalyzed sol-gel process and formation of hollow particles.
abstract: Spherical polyphenylsilsesquioxane (PhSiO(3/2)) particles, one of the inorganic-organic hybrid materials, were synthesized by a two-step acid-base catalyzed sol-gel process, and hollow particles were successfully prepared by washing the as-prepared particles with organic solvents. It was found that the inside and outside parts of the as-prepared particles were composed of PhSi03/2 species with relatively low and high molecular weight, respectively, i.e., the PhSiO(3/2) particles had a kind of "core-shell" structure. Because the core portion in the as-prepared particles was soluble in ethanol and tetrahydrofuran, hollow particles were obtained through washing the as-prepared PhSiO(3/2) particles with ethanol or tetrahydrofuran. Furthermore, the molecular weight of the as-prepared particles was varied by the concentration of phenyltriethoxysilane used as a starting alkoxide. As a result of the variation of the molecular weight, the hollow PhSiO(3/2) particles with different stabilities against organic solvents were formed.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Takahashi
authors.forename: Kiyoharu
authors.initials: K
authors.lastname: Tadanaga
authors.forename: Akitoshi
authors.initials: A
authors.lastname: Hayashi
authors.forename: Atsunori
authors.initials: A
authors.lastname: Matsuda
authors.forename: Kiyofumi
authors.initials: K
authors.lastname: Katagiri
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tatsumisago
mesh_terms: D002621:Chemistry / Q000379:methods*; D015392:Chemistry, Inorganic / Q000379:methods; D002625:Chemistry, Organic / Q000379:methods; D002850:Chromatography, Gel; D000431:Ethanol / Q000737:chemistry; D005663:Furans / Q000737:chemistry; D053768:Metal Nanoparticles; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D036103:Nanotechnology / Q000379:methods*; D017646:Organosilicon Compounds / Q000737:chemistry*; D044367:Phase Transition; D017655:Silicon Compounds / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013997:Time Factors
chemical_list: D005663:Furans; D017646:Organosilicon Compounds; D017655:Silicon Compounds; D012997:Solvents; C525159:polyphenylsilsesquioxane; D000431:Ethanol; C018674:tetrahydrofuran