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  • 1
    Digitale Medien
    Digitale Medien
    Studies of the degradation and protection of wood surfaces (1992)
    Springer
    Wood science and technology 26 (1992), S. 151-163 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Large weight losses occurred in thin veneers of radiata pine (P. radiata) during natural weathering due mainly to loss of lignin and hemicelluloses. This was demonstrated by direct chemical analysis and by spectrocopic techniques. Treatment of veneers with dilute aqueous solutions of the recognized surface stabilizing compound chromium trioxide was found to dramatically restrict weight loss during weathering, but similar applications of ferric compound were less effective (Evans, Schmalzl 1989). In order to rationalize these protective effects FTIR internal reflectance spectroscopy was used to study chemical changes taking place at the wood surface upon treatment and during weathering. The spectra obtained provide direct evidence for the modification and stabilization of the lignin aromatic system with aqueous chromium trioxide and to a lesser extent with ferric salts. It is postulated that photostable lignin complexes are formed. The implications of these findings for the development of improved surface stabilizing compounds for wood are discussed briefly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00194471
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  • 2
    Digitale Medien
    Digitale Medien
    FTIR spectroscopic studies of the reactions of wood and of lignin model compounds with inorganic agents (1992)
    Springer
    Wood science and technology 27 (1992), S. 69-80 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Certain inorganic agents, particularly chromium trioxide, are known to be able to protect wood against weathering. In this paper, the reactions of chromium trioxide, and of some chromic and ferric salts, with wood and with the lignin model compound, guaiacol and derivative, calcium lignosulphonate, have been examined by FTIR reflectance and transmission spectroscopy. Reactions, to different degrees, were obtained with chromium trioxide, and the ferric salts but no reactions with the chromic salts. Intensity changes of bands in the spectra, particularly those near 1,505 and 1,595 cm-1, indicate that reaction of the agents with wood involves the aromatic rings of lignin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00203412
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Infrared spectra of some woods of taxonomic interest (1969)
    Springer
    Wood science and technology 3 (1969), S. 93-99 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die Infrarot-Spektren (4000...250 cm-1) dünner Holzchnitte (12μm) von einigen gefäßführenden Gymnosperment der Ordnung Gnetales, sowie von einem gefäßlosen Angiospermen der Familie Winteraceae zeigten mit Spektren von typischen Angiospermen — und nicht etwa mit denjenigen von Gymnospermen — eine große Ähnlichkeit. Diese Ergebnisse deuten darauf hin, daß die chemische Zusammensetzung einer bestimmten Holzart nicht durch deren anatomisches Gefüge bedingt ist; sie zeigen fernerhin, daß die Ordnung Gnetales chemisch den Angiospermen nahesteht.
    Notizen: Summary Infrared spectra (4000...250 cm-1) of thin sections (12μm) of woods from some pored gymnosperms of the order Gnetales and of a non-pored angiosperm of the family Winteraceae have been obtained and found to resemble closely the spectra of typical angiosperms rather than gymnosperms. These results indicate that the gross chemical composition of a wood is not related to its anatomical structure and show that chemically the Gnetales resemble angiosperms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00639633
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of fibre curl on the properties of wood pulp fibre-cement and silica sheets (1990)
    Springer
    Journal of materials science 25 (1990), S. 5225-5230 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Curl has been induced in unbleached softwood kraft pulp fibres by treatment in the laboratory at 20% consistency in a planetary mixer. Steam treatment of the fibres to set the curl more strongly was found to be detrimental to fibre properties as deduced from handsheet properties. A means of producing two-ply specimens in the laboratory was devised and a tensile test for interlaminar bond strength was developed. The use of curly fibres in reinforced cement and silica sheets gave sheets with improved wet interlaminar bond strengths, relative to sheets prepared from conventionally treated fibres but had little effect on the values of modulus of rupture and fracture toughness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00580155
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