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  • 1980-1984  (6)
  • 1950-1954
  • 1905-1909
  • 1982  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Die Berechnung komplexer Absorptionsgleichgewichte ionogener Substanzen in wäßrigen Lösungsmitteln mit Hilfe eines Reaktionsmodells (1982)
    Springer
    Monatshefte für Chemie 113 (1982), S. 1367-1392 
    Details
    ISSN: 1434-4475
    Keywords: Absorption equilibrium ; Data regression ; Ionogene substances ; Maximum likelihood principle ; Reaction equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The solubility of ionogen substances in water and aqueous ionic solutions is important for calculation of absorption processes. Aqueous solutions with complex reaction systems behave themselves extremely nonideal. In simple cases equilibria can be determined with the concept of nonideal thermodynamics. The model used in this work is based on ideal calculation of reaction equilibria and gas solubility. The model parameters (equilibrium constants andHenry constants) for the systems SO2-H2O,MEA-H2S-H2O,DEA-H2S-H2O andMEA-CO2-H2O are computed by regression of experimental data. Equilibrium reactions are selected according toBrinkley's method. The selection of the reacting species has decisive influence on the accuracy of the data fitting. Data regression is done numerically and leads to the formulation of nonlinear systems of equations, which have to be solved for each data point. This solutions are performed in an inner loop. By using the maximum-likelihood-principle the model parameters are optimized in the superior regression loop. Experimental data for the regression are the partial pressure and the total concentration of gas in the liquid phase. The used model is able to fit these data satisfactoryly. The model parameters, which are calculated from simultaneous data regression for different temperatures, ensure a simple correlation ofvan't Hoff. However, for similar reactions equilibria in different reaction systems, it is impossible to compute the same values for the equilibrium constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808937
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear processes II (1982)
    Springer
    Applied physics 28 (1982), S. 262-268 
    Details
    ISSN: 1432-0649
    Keywords: 78 ; 42.65 ; 61.40 ; 73 ; 73.20 ; 82 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697854
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Imprägnierung von Papieren mit Phenolharzlösungen. Teil III. Modelluntersuchungen zum Imprägnierprozeß an CellulosehohlfasernTeil II: Acta Polymerica 33 (1982) 561-566. (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 667-671 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The impregnation of cellulose fibres with phenolic resins are influenced by viscosity (degree of condensation and concentration of solution), surface tension and diameter of capillaries qualitatively (laws of HAGEN POISEUILLE and capillaries). After drying the cellulose fibres involve pores. The film of resins at the walls of fibres is not homogeneous. It is possible that during the impregnation the polymers and the solvent are separated.
    Notes: Der Imprägnierprozeß von Hohlen Cellulosefasern mit Phenolharzlösung wird qualitativ von der Viskosität (vom Kondensationsgrad bzw. vom Molgewicht und von der Konzentration der Lösung), der Oberflächenspannung sowie dem verwendeten Kapillarradius (HAGEN-POISEUILLESCHES Gesetz, Kapillargesetz) beeinfulßt. Nach dem Trocknen verbleibt im Inneren der Cellulosehohlfasern ein Hohlraum. Die Wandbeschichtung mit Harz ist nicht homoge. Während des Imprägnierozesses tritt vermutlich eine Auftrennung in Harz und Lösungsmittel ein.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331111
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  • 4
    Electronic Resource
    Electronic Resource
    Imprägnierung von Papieren mit Phenolharzlösungen. Teil II: Rasterelektronenmikroskopische Untersuchungen zum Gehalt und zur Verteilung des Harzes im Prepreg (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 561-566 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The distribution of phenol formaldehyde resins in cellulose papers (cotton linter s90 g/m2) was studied by light- and scanning electronmicroscopy using plasma etching as preparation method. With increasing viscosity of the solutions of resins the wetting of the pores in the paper and fibres arises. Phenol formaldehyde resins of high viscosity also penetrate the paper completely.
    Notes: Die Phenol-Formaldehydharzverteilung im Cellulosepapier (Baumwollinters 90 g/m2) wurde mittels Licht-und Rasterelektronenmikroskopie im Zusammenhang mit der Plasmaätztechnik untersucht. Mit steigender Viskosität der Harzlösungen nimmt im untersuchten Meßbereich die Ausfüllung der Faserzwischenräume und der Hohlräume in den Fasern des Papieres zu. Auch hochviskose Phenol-Formaldehydharze durchdringen das Papier.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330912
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  • 5
    Electronic Resource
    Electronic Resource
    Imprägnierung von Papieren mit Phenolharzlösungen. Teil I. Plasmaätzung von harzgetränkten Papieren für rasterelektronenmikroskopische Untersuchungen (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 495-500 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: To investigate the impregnation process of papers with solutions of phenol formaldehyde resins by scanning electron microscopy (SEM) the etching of specimens in a nonthermal O2-plasma is the most succesful way of preparation. Agglomerations of resins disppear and details of the morphology of resins and fibres will be visible. Single, hollow cellulose fibres can be opened at one side by etching and the wetting of the inner of fibres with resin can be investigated.
    Notes: Zur Untersuchung des Tränkovorganges von Papieren mit Phenol-Formaldehyd-Harz-Lösungen mittels Rasterelektronenmikroskopie eignet sich die Präparation der Provben durch Ätzung in einem nichtthermischen O2-Plasma. Harzverkebungen werden entfernt und morphologische Details des Harzes und der Fasern sichtbar gemacht. Einzelne hohle Cellulosefasern konnten durch Wegätzen der Faseroberseite geöfnet und die Harzbendtzung im Faserinneren freigelegt werden.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330811
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Plasmaäautzung von Polymeren. VII. Untersuchungen zur Selektivitäaut des plasmachemischen Abbaus von PBTP-systemenTeil VI: Acta Polymerica 32 (1981) 337-343 (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 209-214 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymers added to polybutylene terephthalate, as polyvinylacetate and epoxide resins, affect in different ways the structure of the matrix polymer. While polyvinylacetate scarcely changes the structure of the matrix polymer, its supramolecularstructure formation is heavily suppressed by epoxide resins. This was shown by using the plasma etching technique. The injection molding samples investigated contained polyvinylacetate in the internal region only as a separate secondary phase.
    Notes: Polymere Zusätze zu Polybutylenterephthalat (PBTP), wie Polyvinylacetat und Epoxidharz, beeinflussen in unterschiedlicher Weise die Strukturierung der Matrix. Polyvinylacetat verändert kaum die PBTP-S-Matrixstruktur, während Epoxidharzzusatz übermolekulare Strukturierungen der Matrix weitgehend unterdrückt. Dies wurde mit Hilfe der selektiven Plasmaätztechnik festgestellt. Polyvinylacetat war in den untersuchten Spritzgußproben nur im Inneren der Proben, in Form einer separaten zweiten Phase enthalten.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330310
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