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Chemistry of aging

Mayo, The Chemistry of Aging of Hydrocarbon Binders in Solid Propellants , CP lA Publ 262, Johns Hopkins Univ, Silver Spring (1975)... [Pg.807]

Mayo, F. R., Irwin, K. C., Some Physical Organic Chemistry of Aging... [Pg.335]

In this chapter, we will describe the make-up of just three textile materials, all natural fibres, and will further present the mechanisms of degradation of their principal components. Our selection of two of them is somewhat indulgent as they are each the focus of current research projects. However, since all three compose the fabric of key historic textiles which were recently the subjects of commissions completed by Conservation Services at the Textile Conservation Centre, our choice was all the more easily made. Here we are keen to place the science in context, and so use these artefacts to introduce the fibres and their chemistry of ageing through a conservation science perspective. [Pg.57]

NM Emanuel, AL Buchachenko. Physical Chemistry of Aging and Stabilization of Polymers. Moscow Izd. Nauka, 1982, p 356 Polym Eng Sci 20 662, 1980. AK Kulshreshtha, VK Kaushik, GC Pandey, S Chakrapani, YM Sharma. J Appl Polym Sci 37 669, 1989. [Pg.466]

Organoaluminum Compounds. Apphcation of aluminum compounds in organic chemistry came of age in the 1950s when the direct synthesis of trialkylalurninum compounds, particularly triethylalurninum and triisobutylalurninum from metallic aluminum, hydrogen, and the olefins ethylene and isobutylene, made available economic organoalurninum raw materials for a wide variety of chemical reactions (see a-BONDED alkyls and aryls). [Pg.137]

Decompositions may be exothermic or endothermic. Solids that decompose without melting upon heating are mostly such that can give rise to gaseous products. When a gas is made, the rate can be affected by the diffusional resistance of the product zone. Particle size is a factor. Aging of a solid can result in crystallization of the surface that has been found to affect the rate of reaction. Annealing reduces strains and slows any decomposition rates. The decompositions of some fine powders follow a first-order law. In other cases, the decomposed fraction x is in accordance with the Avrami-Erofeyev equation (cited by Galwey, Chemistry of Solids, Chapman Hall, 1967)... [Pg.2122]

The first time I recall being clearly directed to the periodic table and some of its features, was on making the transition between Ordinary Level and Advanced Level chemistry at age 16. This delay added to the delight of the discovery, if anything, since I experienced the wonder of seeing how previously covered information suddenly fell into place in a coherent framework. [Pg.1]

The sensitivity of barley to the toxin increases as the stage of germination advances. This may be partially explained by the presence of antifungal agents in the young plant whose activity is reduced with age (8,12). Further progress on the chemistry of this material is reported by Stoessl (14). [Pg.111]

The summary of the bulk chemical compositions (major elements, minor elements, rare earth elements), Sr/ Sr (Farrell et al., 1978 Farrell and Holland, 1983), microscopic observation, and chemistry of spinel of unaltered basalt clarifies the tectonic setting of Kuroko deposits. Based on the geochemical data on the selected basalt samples which suffered very weak alteration, it can be pointed out that the basalt that erupted almost contemporaneously with the Kuroko mineralization was BABB (back-arc basin basalt) with geochemical features of which are intermediate between Island arc tholeiite and N-type MORE. This clearly supports the theory that Kuroko deposits formed at back-arc basin at middle Miocene age. [Pg.19]

Alley RB, Mayewski PA, Sowers T, Stuiver M, Taylor KC, Clark PU (1997) Holocene climatic instability A prominent, widespread event 8200 yr ago. Geology 25 483-486 Amelin Y, Zaitsev AN (2002) Precise geochronology of phoscorites and carbonatites The critical role of U-series disequilibrium in age interpretations. Geochim Cosmochim Acta 66 2399-2419 Amundson RG, Chadwick OA, Sowers JM, Doner HE (1988) Relationship between climate and vegetation and the stable carbon isotope chemistry of soils in the eastern Mojave Desert, Nevada. Ouat Res 29 245-254... [Pg.450]

Argues that this most influential treatise on chemistry of the late Middle Ages was most probably written by Paul of Taranto, rather than, as usually assumed, Geber... [Pg.208]

Contents I. Alchemy - the chemistry of the Middle Ages II. The birth of chemistry... [Pg.558]

Dosimetry of the Museum Environment Environmental Effects on the Chemistry of Paintings. Oscar F. van den Brink, Molecular Aspects of Ageing in Painted Works of... [Pg.57]

Flora, K.K. and Brennan, J.D. (2001) Effect of matrix aging on the behavior ofhuman serum albumin entrapped in a tetraethyl orthosilicate-derived glass. Chemistry of Materials, 13, 4170—4179. [Pg.107]

Torma, V., Peterlik, H., Bauer, U., Rupp, W., Husing, N., Bernstorff, S., Steinhart, M., Goerigk, G. and Schubert, U. (2005) Mixed silica titania materials prepared from a singlesource sol-gel precursor A time-resolved SAXS study of the gelation, aging, supercritical drying, and calcination processes. Chemistry of Materials, 17, 3146-3153. [Pg.112]


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See also in sourсe #XX -- [ Pg.121 ]




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