Thermal Softening Behavior and Application to Transparent Thick Films of Poly(benzylsilsesquioxane) Particles Prepared by the Sol–Gel Process

Abstract

Thick films of poly(benzylsilsesquioxane) (BnSiO 3/2 ) particles, prepared by the sol-gel process, were deposited onto indiumtin-oxide-coated glass substrates by electrophoresis for the application to the micropatterning of the films. BnSiO 3/2 particles were thermally softened and sintered at ϳ50°C, which was above the glass transition temperature of the particles. The films prepared by the electrophoretic sol-gel deposition consisted of aggregates of particles with diameters of 0.2-1 m and were opaque. The film shrank from 2.5 m to 1.4 m in thickness and became transparent upon sintering of the particles during heat treatment at temperatures >100°C.

Corrosion Protection of AISI 304 Stainless Steel with Melting Gel Coatings

“…The softening behavior of "melting gels" was reported for the first time for a poly(benzylsilsesquioxane) based system by Matsuda et al [13]. Later, using phenyltriethoxysilane (PhTES) and diphenyldiethoxysilane (DPhDES) or MTES and dimethyldiethoxysilane (DMDES) in two steps of catalysis, Masai et al [14] obtained organically modified polysilsesquioxanes with a low softening point.…”

Insertion Mechanism of N2and O2into Tn(n= 8, 10, 12)-Silsesquioxane Framework

“…11 Recently, they have been used in the construction of microelectronic mechanical systems 12 and fabrication of microoptical devices. 13 They serve as excellent models to mimic the "functions" of zeolites; for example, gallosiloxanes are analogous to the building units of zeolites. 14 Metal-containing silsesquioxanes, oligometalla-silsesquioxanes, function as catalytic converters for homogeneous catalysts for olefin processing: metathesis, epoxidation, and polymerization of alkenes are easily accomplished with POSS derivatives.…”

Erratum to: Organic–inorganic hybrid melting gels

“…An early approach to ''melting gels'' involved preparing poly(benzyl-silsesquioxane) particles, which were deposited onto an indium-tin oxide (ITO) coated substrate by electrophoretic deposition. After heat treatment at very low temperatures, continuous thick transparent films were obtained [2]. Using a different approach with PhTES and DPhDES (diphenyldiethoxysilane), poly-silsesquioxanes were obtained that showed a low softening point.…”

“…A special category of hybrid gels constitutes the socalled ''melting gels'' [2][3][4]. These hybrids have been developed to replace low melting temperature sealing glasses that melt around 600°C.…”

“…While the softening behavior has been called melting, it is not melting in a thermodynamic sense [2]. At the same time, it is not thixotropic behavior either, because the material cannot be caused to flow by shearing.…”