By Minoru Tomozawa and Robert H. Doremus (Eds.)
ISBN-10: 0123418224
ISBN-13: 9780123418227
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Example text
After addition of the methyl methacrylate the polymerization is easily followed by the decrease of intensity of the bands specific to the vinyl groups. In the past ten years a rapid development has taken place in the study of porous glasses. Effective catalysts and substrates for 50 H. H. DUNKEN catalysts have been developed for biological syntheses (Pilkington, 1972; Weetall, 1973; Heyer et ai, 1977; Bettelheim, 1979). , 1975; Zdanov, 1979). The effectiveness and selectivity of porous glasses for catalysis and separation depend on the functionality of the sur face groups and the pore size and structure.
In the case of H 2 0 a possible reaction mech anism has already been developed. An addition reaction of HX on the silicon atom leads secondarily to splitting and reaction of the silicon-oxygen bridge. ''Strained" silicon-oxygen bridges are espe cially reactive in this way: =Si— O—Si= + H X - * =SiX + H—OSi= Nitrogen-containing molecules that are electron donors, such as NH3, amine, and pyridine especially, catalyze surface reactions with silanol groups and lead through an intermediate state to the dissocia tive reaction of HX and rupture of the silicone-oxygen bridge (Bok- 48 H.
The determination of specific sur face quantities for the glass surface from adsorption isotherms is likewise not without problems. There are many methods of measurement and data treatment to overcome these difficulties (Gregg and Sing, 1967; Komarov, 1977), which, however, lead to certain experimental limitations. The ad sorbing particles must form a monolayer on the surface. Micropores are a problem. A further requirement is knowledge of the types of sites needed for adsorbing atoms or molecules.
Glass IIITreatise on Materials Science and Technology by Minoru Tomozawa and Robert H. Doremus (Eds.)
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