Carbonyl groups, 40. addition surface

Reaction of TYZOR TPT with polyperfluoroalkylene ethers containing a carbonyl group produces a complex that is an excellent surface-treating agent, imparting improved surface wettabiUty and anticorrosion properties to metal surfaces (144). These complexes can be used by themselves, or as additives to perfluoropolyethers as vacuum pump oils, lubricant oils, or mold release agents. 

Friedrich et al. also used XPS to investigate the mechanisms responsible for adhesion between evaporated metal films and polymer substrates [28]. They suggested that the products formed at the metal/polymer interface were determined by redox reactions occurring between the metal and polymer. In particular, it was shown that carbonyl groups in polymers could react with chromium. Thus, a layer of chromium that was 0.4 nm in thickness decreased the carbonyl content on the surface of polyethylene terephthalate (PET) or polymethylmethacrylate (PMMA) by about 8% but decreased the carbonyl content on the surface of polycarbonate (PC) by 77%. The C(ls) and 0(ls) spectra of PC before and after evaporation of chromium onto the surface are shown in Fig. 22. Before evaporation of chromium, the C(ls) spectra consisted of two components near 284.6 eV that were assigned to carbon atoms in the benzene rings and in the methyl groups. Two additional... 

Most workers try to explain the final stereochemistry of the OH group on the basis of adsorption. That is, the mode of adsorption determines the resulting stereochemistry, assuming that the addition of hydrogen occurs cis from the surface up to the bottom of the adsorbed carbonyl group. Most investigators seem to assume that the carbonyl is protonated in acidic media and the mode of adsorption of this species is different from the unprotonated species (in neutral and basic media). 

Maleic anhydride CAS. 108-3I-6. til, maleic acid [CAS 110-16-7]. (2), and I umarie acid [CAS 110-17-81. i3) are multifunctional chemical intermediates that lind applications in nearly every Held id industrial chemistry. Each molecule contains two acid carbonyl groups and a double bond in the u. position. Maleic anhydride and maleic acid are important raw materials used in the manufacture of phthalic-type alkyd and polyester resins, surface coatings, lubricant additives, plasticizers. copolymers, and agricultural chemicals [see Alkyd Resins Polymers, and Lubricant). Both chemicals derive their common names from naturally occurring malic acid. 

Although in the above paper MeS- was studied, MeO- was not, but the latter has now been investigated in detail. Lehn149 and co-workers computed the PE surface for the simplest nucleophilic addition to a carbonyl group, i.e. reaction (8). A... 

As-prepared EG shows evidence for the presence of carbonyl and hydroxyl groups on the surface, After further treatment of EG with a nitric and sulfuric acid mixture, we obtained a water solution of EG, along with the insoluble portion of the sample which settled out. The infrared (IR) spectrum of the soluble part obtained after drying shows a prominent band due to carbonyl groups in addition to a broad band due to -OH groups as shown in Fig. 8(a). The Raman spectrum of the water-soluble EG shown in Fig. 8(b) exhibits the characteristic G, D and 2D... 

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