Organically modified ceramics

The abihty of organically modified ceramics based on alumina, zkconia, titania, or siUca (and mixtures of each) to function as abrasion-resistant coatings has also been studied (62). Eor example, polycarbonate, when coated with an epoxy—aluminosihcate system, experiences a significant reduction in the degree of hazing induced by an abrader, as compared to uncoated polycarbonate. 

Simon P.F.W., Ulrich R., Spiess H.W., and Wiesner U. Block copolymer-ceramic hybrid materials from organically modified ceramic precursors, Chem. Mater., 13, 3464, 2001. 

Note 1 Organically modified ceramics are hybrid polymers with inorganic and organic moieties linked by stable covalent bonds and based on organically modified alkoxysilanes, functionalized organic polymers or both. 

Note 2 Though it is a commonly used acronym for organically modified ceramic, Ormocer is a registered trademark and as such its terminological use is strongly discouraged. 

Another unique aspect of the sol-gel process in this context is the synthesis of Ormo-cers (organically modified ceramics)111. Different organic-inorganic sol-gel precursors have been used for this purpose for the development of new glasses with second-order nonlinearities257-261. In these materials, organic chromophores are chemically bonded... 

Also other oxides such as for example Z1O2 were reacted in solution with other organic compounds to form amorphous hybrid composites. The name Ormocers (organically modified ceramics) was then used by Schmidt for these new materials. 

Organically modified ceramics are more difficult to synthesize when metals other than silicon are involved. The more polar M-C bond would be broken upon hydrolysis. Strongly complexing organic ligands such as P-diketonates must then be used in order to form a... 

The term ormocer derives from organically modified ceramic and these materials were developed at the Fraunhofer Institute, Wurzburg, Germany. Their original use was as speciality coatings for various technical applications, such as protective coatings. 

Epoxy-based compositions are based on a solid epoxy resin, a photoadd generator and a solvent. The viscosity of the inks can be tuned either by adding solvents or reactive diluents. A dynamic viscosity of 20-30 mPa s is desirable. As a sol-gel based material, an organically modified ceramic was used (19). 

Keywords Organically modified ceramic Sol-gel process Textile Tunable coating UV absorption... 

Okubo T., Nagamoto H. Low temperature preparation of nanostructured zirconia and YSZ by sol-gel processing. J. Mater. Sci. 1995 30 749-757 Okubo T., Takahashi T., Sadakata M., Nagamoto H. Crack-free porous YSZ membrane via controlled synthesis of zirconia sol. J. Membr. Sci. 1996 118 151-157 Palinko L, Torok B., Surya Prakash G.K., Olah G.A. Surface characterization of variously treated Nafion-H, Nafion-H supported on silica and Nafion-H silica nanocomposite catalysts by infrared microscopy. Appl. Catal. A Gen. 1998 174 147-153 Schmidt H., Wolter H. Organically modified ceramics and their applications. J. Non-Cryst. SoUds 1990 121 428 35... 

Schmidt H., Wolter H. Organically modified ceramics and their applications. J. Non-Cryst. Solids 1990 121 428-435... 

Ormocers (Organically Modified Ceramics) were used by Stoch et al. (1994) in the waterproofing and consolidation of the surface oflimestone and sandstone. Wetting angle, porosity and water absorption were measured prior to and after treatment. 

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