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  • Polymer and Materials Science  (5)
  • Analytical Chemistry and Spectroscopy  (2)
  • Inorganic Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of acrylonitrile-butadiene-styrene terpolymers by computer aided FT-IR spectroscopy (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 149 (1987), S. 179-187 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird die schnelle Identifizierung und genaue Charakterisierung von Acrylnitril-Butadien-Styrol-Terpolymeren (ABS) mit Hilfe der rechnerunterstützten Fourier-Transform-Infrarot(FT-IR)-Spektroskopie beschrieben. Die Proben wurden aus Chloroformsuspensionen als Filme hergestellt und nach der FT-IR-spektroskopischen Untersuchung durch Vergleich mit im Rechner gespeicherten bekannten Spektren identifiziert.Die mit Hilfe von physikalischen Mischungen eines bekannten Terpolymeren mit verschiedenen Mengen der entsprechenden Homopolymeren erhaltenen Eichkurven der monomerspezifischen Absorptionen wurden benutzt, um die Zusammensetzung von unbekannten ABS-Systemen zu bestimmen.
    Notes: The fast identification and accurate characterization of acrylonitrile-butadienestyrene (ABS) terpolymers by computer aided Fourier transform infrared spectroscopy is described. Samples are prepared as films from chloroform suspensions and identified by a library search routine after FTIR measurement. Calibration curves of monomer specific absorptions obtained from physical mixtures of a known terpolymer with different amounts of the corresponding homopolymers are used to quantify the incorporation ratios of unknown ABS systems.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051490115
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  • 2
    Electronic Resource
    Electronic Resource
    Mikrofiltration in der Prozeßtechnik mittels keramischer Membranen (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1197-1198 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306709159
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  • 3
    Electronic Resource
    Electronic Resource
    Convex-lens-on-slide: A simple system for the study of human plasma and blood in narrow spaces (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 643-654 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: On clot-promoting surfaces, intact normal blood or plasma deposits fibrinogen and then supplants it with high molecular weight kininogen (HMWK). On glass, plasma layers of less than about 25 μm thick, while still containing enough fibrinogen to coat the surrounding surfaces, lack sufficient HMWK per surface area to remove this fibrinogen deposit. Thus normal intact citrated plasma allowed to enter the space between a glass slide and a convex lens resting belly-down on the slide will leave a disc of fibrinogen where the thickness of plasma layer was below this “critical height” H. The discs of fibrinogen left by plasma that lacks HMWK pathologically or by activation or dilution, are larger - the required H being greater. The present study shows that plasma dilution (final volume divided by original plasma volume) plotted against H yields a straight line. In preliminary series, the slope of this line increases with the atomic weight of five metals whose oxidized surfaces were used as substrates. In whole blood collected in either heparin or ACD, a circle of platelets adheres to oxidized silicon, anodized tantalum, or glass; this circle is similar in size to the one of fibrinogen left by plasma.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180606
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  • 4
    Electronic Resource
    Electronic Resource
    Application of 2D EXSY NMR spectroscopy to the study of the dynamic behaviour of aroylcyanoketene-S,S-dimethylacetals (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 204-206 
    Details
    ISSN: 0749-1581
    Keywords: 2D EXSY NMR ; Complete line-shape analysis ; Aroylcyanoketene-S,S-dimethylacetals ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The applicability of 2D EXSY NMR spectroscopy for studying quantitatively the dynamic behaviour in three aroylcyanoketene-S, S-dimethylacetals was tested by means of 1H NMR spectroscopy. It can be concluded that the method is a reasonable qualitative supplement to complete line-shape analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290303
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the distribution of the π-electrons in push-pull alkenes by 1H and 13C NMR spectroscopy (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 212-222 
    Details
    ISSN: 0749-1581
    Keywords: Dynamic NMR ; 13C NMR ; Push-pull alkenes ; Restricted C,C and C,N rotation ; π-Electron density distribution ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Push-pull alkenes with variable structure were investigated with respect to the influence of the different substituents at the central C,C double bond on the dynamic behaviour of this type of compound. 1H and 13C NMR spectroscopic investigations were carried out for ketene-S,S-, -S,N- and -N,N-acetals. HMO calculations were employed to discuss the related π-electron density distributions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290305
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  • 6
    Electronic Resource
    Electronic Resource
    Das Adsorptionsverhalten sehr dünner Kohlenstoff-FolienProfessor H. W. Kohlschütter zum 60. Geburtstage gewidmet (1962)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 316 (1962), S. 119-127 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Extremely thin carbon foils were obtained: 1by reduction of graphite oxide (G.O.) suspended in dilute sodium hydroxide,2by deflegration of heated G.O.The adsorption of nitrogen, methylene blue and phenol were measured as well as the catalytic efficiency in the HBr synthesis.With the samples obtained by reduction of G. O., larger surface areas were found by adsorption from solution than by nitrogen adsorption or from the catalytic efficiency. This is explained by the agglomeration of the foils on isolation.With the deflagration product, however, all methods gave the same surface areas. The cause of this different adsorption behaviour is discussed.
    Notes: Sehr dünne Kohlenstoff-Folien wurden erhalten: 1durch Reduktion einer Suspension von Graphitoxyd (G. O.) in verdünnter Natronlauge,2durch Verpuffung von G. O. beim Erhitzen.Die Adsorption von Stickstoff, von Methylenblau und von Phenol wurde gemessen; außerdem wurde die katalytische Leistung bei der HBr-Synthese bestimmt.Bei dem durch Reduktion erhaltenen Präparat wurden mit der Adsorption aus wäßriger Lösung größere spez. Oberflächen gefunden, als mit der Gasadsorption oder aus der katalytischen Leistung. Die größte spez. Oberfläche wurde direkt in der bei der Reduktion erhaltenen Suspension gemessen. Die niederen Werte der spez. Oberfläche sind eine Folge der Agglomeration bei der Isolierung.Im Gegensatz dazu gaben bei dem durch Verpuffen erhaltenen Präparat alle Methoden gleiche spez. Oberflächen. Dieser Unterschied wird darauf zurückgeführt, daß die Folien des durch Verpuffen von G. O. erhaltenen Präparates im Gegensatz zu denen des Reduktionsproduktes durchlöchert sind.Die Messung der katalytischen Leistung ergab, daß die Bromwasserstoff-Bildung an den Basisflächen des Kohlenstoffs erfolgt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19623160303
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  • 7
    Electronic Resource
    Electronic Resource
    Assoziationsverhalten von Stannatranen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 463 (1980), S. 123-131 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Association Behaviour of Strannatranes1-Alkylstannatranes (R = Me, Et, Bu, Phenyl) associate in unpolar solvents to relatively stable trimeric units. In aqueous solution 1-methylstannatran displays no autoassociation. 1-t-Butylstannatran, 1-o-tolylstannatran, and 1-alkylthiostannatranes are monomeric in all kinds of solvents. The association behaviour is characterized by molecular mass estimation and 1H-, 13C-, and 119Sn-NMR measurements.
    Notes: Es wird über einige neue Stannatrane und Thiostannatrane berichtet und gezeigt, daß die 1-Alkylstannatrane in unpolaren Lösungsmitteln zu relativ stabilen trimeren Einheiten assoziieren. In wäßriger Lösung zeigt 1-Methylstannatran keine Selbstassoziation. 1-t-Butylstannatran, 1-o-Tolylstannatran und 1-Alkylthiostannatrane sind in allen Lösungsmitteln monomer. Das Assoziationsverhalten wird durch Molekulargewichtsbestimmung und 1H-, 13C- und 119Sn-NMR-Messungen charakterisiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804630117
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of mold-filling conditions on fiber distribution in injection-molded disks and on the mechanical properties of such disks (1985)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 5 (1985), S. 19-26 
    Details
    ISSN: 0730-6679
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The mechanical properties of test specimens from centrally injection-molded disks made of short glass fiber-reinforced polyamide 6,6 were tested under conditions of monaxial and biaxial constant strain rate and impact stress. In addition, the disposition of the glass fibers in the molded parts was established by optical microscopy and roentgenographic methods. Image analysis was used to measure the reduction of mean fiber length caused by processing and to determine quantitatively the fiber orientation. The possible existence of a correlation between fiber orientation data, as obtained from photomicrographs of polished sections, mechanical properties, and fracture characteristics is discussed.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1985.060050103
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  • 9
    Electronic Resource
    Electronic Resource
    Measuring spatial fiber orientation - A method for quality control of fiber reinforced plastics (1990)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 10 (1990), S. 135-141 
    Details
    ISSN: 0730-6679
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Properties of short and especially long fiber reinforced thermoplastics highly depend on fiber length distribution in the processed material and local fiber orientation in the processed part. Good mechanical performance is achieved, if overall mean fiber length is high and fiber orientation is well adapted to the external stress situation. If non optimized processing parameters are applied, a decay in mean fiber length and unfavorably orientated fibers in areas of high stress may result. Knowledge of morphological parameters provides quantitative information about the injection molding process and the design of the cavity. Recent advances in automated methods of measuring fiber length and spatial fiber orientation, which are based on image processing systems, reveal even small differences in morphology. Measuring spatial fiber orientation on polished cross-sections by means of an image processor is a newer concept, that allows fast and quantitative description and optimization of the mold filling process. Some examples show the performance of the method; the measured fiber orientation is used to model thermal expansion and Young's modulus.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1990.060100206
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