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  • 1
    Electronic Resource
    Electronic Resource
    Cluster analysis of protein fourier transform infrared spectra (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 1831-1838 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cluster analysis techniques were used to examine a set of Fourier transform infrared (FT-IR) spectra of bovine serum albumin (BSA) in the adsorbed and nonadsorbed states. The region from 1480 to 1600 cm-1, comprising the amide II band, was used. Spectra were preprocessed to compensate for linear baseline variation, and the single linkage method of cluster analysis was applied. As expected, the spectra of adsorbed and nonadsorbed BSA fell into two distinct clusters. However, no further clustering was observed among the adsorbed BSA spectra on the basis of surface type, suggesting that surface specificity of the spectral changes induced in BSA by adsorption is not detectable above experimental variation. This work illustrates the value of using cluster analysis in the FT-IR study of proteins as a complement to other data analysis methods.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360271111
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  • 2
    Electronic Resource
    Electronic Resource
    Addition polyimides. II. Synthesis and characterization of bisitaconimide prepolymers (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 127-144 
    Details
    ISSN: 0021-8995
    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 , Physics
    Notes: N,N′-bis(3,3′-itaconimidophenyl) sulfone has been synthesized by reacting itaconic anhydride with 3,3′-diamino diphenyl sulfone. The bisitaconimides and the intermediates were characterized by chemical analysis, IR, NMR, TG, and GPC. The degree of polymerization (DP) of the prepolymers of the bisitaconimide was followed by GPC and from the NMR data on vinylidene and aromatic proton ratios. The correlation between DP and intrinsic viscosity of the prepolymers was made use of to determine the Mark-Houwink constants (K and α). The thermal stability and the decomposition kinetics of the prepolymers were evaluated from TG data. The kinetic parameters, viz. energy of activation, E, and preexponential factor A, were computed using four nonisothermal integral equations, and their values are not appreciably affected by the degree of polymerization, within the range studied.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370110
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  • 3
    Electronic Resource
    Electronic Resource
    Pitting of austenitic stainless steel clad metals (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 76-80 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Lochkorrosion von mit austenitischem nichtrostendem Stahl plattierten MetallenAufschweißungen aus austenitischen nichtrostenden Stählen mit unterschiedlichen Ferritgehalten (FN 4 und 12) wurden mittels Unterpulverschweißen unter Verwendung von Bandmaterial hergestellt. Anschließend wurde die Plattierung einiger Proben mittels WIG umgeschmolzen. Die Plattierungen wurden nach dem Schweißvorgang bei 600, 800 und 1000°C eine Stunde lang behandelt und dann die Lochkorrosionspotentiale in 1 N Schwefelsäure + 0,5 N NaCl gemessen. In der gleichen Lösung wurde auch bei den Lochkorrosionspotentialen gearbeitet, um die Lage der Korrosionsstellen zu ermitteln; im übrigen wurden auch Untersuchungen in 10%iger FeCl3-Lösung durchgeführt. Die Ergebnisse zeigen, daß zunehmender Ferritgehalt die Beständigkeit der Lochkorrosion verringert; die gleiche Wirkung hat Wärmebehandlung bei 800°C nach dem Schweißen, während die Behandlung bei 1000°C die Beständigkeit gegen Lochkorrosion an den Austenit/Ferrit-Grenzflächen verbessert. Die WIG-umgeschmolzenen Proben zeigten geringere Lochzahlen als die entsprechenden unterpulvergeschweißten Materialien.
    Notes: Austenitic stainless steel welds with different ferrite contents (4 and 12 FN) were obtained by the Submerged Arc Welding (SAW) strip cladding process, and some clads were remelted by TIG. The welds were post weld heat treated (PWHT) at 600, 800, 1000°C for 1 h. Pitting potentials were measured in 1 N H2SO4 + 0.5 N NaCl. Etching at the pitting potentials was carried out in the same solution in order to locate the pit sites; pitting studies were also conducted in 10% FeCl3 solution.The results showed that an increase in ferrite content decreases pitting resistance. PWHT at 800°C decreases pitting resistance, too, whereas PWHT at 1000°C results in increased pitting resistance at austenite/ferrite interfaces. TIG samples showed less pits than their SAW counterparts.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900410207
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Ferrite content and weld heat input on the room temperature stress corrosion cracking resistance of austenitic clad metals (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 178-184 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß des Ferritgehalts und der Wärmeeinbringung beim Schweißen auf die Beständigkeit austenitischer Auftragswerkstoffe gegen Spannungsrißkorrosion bei RaumtemperaturAuftragsschweißungen aus austenitischen nichtrostenden Stählen mit unterschiedlichen Ferritgehalten (FN 2, 4, 10 und 12) wurden durch Unterpulveraufschweißen von Blechen erhalten. Um den Einfluß der Wärmeeinbringung zu ermitteln, wurden die Auftragsschweißungen vom Grundmaterial getrennt und mittels WIG umgeschmolzen. Das Verhalten gegen Spannungsrißkorrosion wurde unter Verwendung von gekerbten Zugproben in 5 N Schwefelsäure + 0,5 N NaCl bei Raumtemperatur untersucht. Als Kriterium für die relative Spannungsrißkorrosionanfälligkeit wurde die Belastung gewählt, die innerhalb von 100 h zum Bruch der Proben führte. Der Einfluß des kathodischen Schutzes wurde durch Kontakt der Proben mit Zink untersucht.Die Ergebnisse zeigen, daß zunehmende Ferritgehalte die Widerstandsfähigkeit gegen Spannungsrißkorrosion verringern, wobei das WIG-umgeschmolzene Material höhere Beständigkeit als das unterpulvergeschweißte aufweist. Kathodischer Schutz verbessert die Widerstandsfähigkeit aller Proben. Die Rißbildung ist bedingt durch verformungsunterstützte Ferritauflösung und durch Spannungsrißkorrosion im Austenit, die wiederum durch einen Tunnelmechanismus hervorgerufen wird.
    Notes: Austenitic stainless steel claddings with different ferrite contents (2, 4, 10, 12 FN) were obtained by the submerged are welding (SAW) strip cladding process. In order to study the effect of heat input the claddings were removed from the base plate and TIG remelted. Stress corrosion cracking (SCC) tests were carried out with notched tensile specimens in 5 N H2SO4 + 0.5 N NaCl at room temperature. A net-section stress required to break the specimen in 100 hours was taken as a criterion of relative SCC susceptibility. The effect of cathodic protection was studied by coupling the specimens with zinc.The results showed that increasing ferrite content decreases SCC resistance. TIG remelted material exhibited better SCC resistance than the SAW specimens. Cathodic protection improves the SCC resistance of all the specimens. Cracking was found to be due to strain-assisted ferrite dissolution and SCC in austenite. SCC in austenite was due to tunnelling mechanism.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900410405
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  • 5
    Electronic Resource
    Electronic Resource
    Addition polyimides. I. Kinetics of cure reaction and thermal decomposition of bismaleimides (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 6033-6042 
    Details
    ISSN: 0021-8995
    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 , Physics
    Notes: The thermal polymerization of four structurally different bismaleimide resins, prepared by reacting maleic anhydride with four aromatic diamines, viz., 4,4′-diaminodiphenyl methane, 4,4′-diamino diphenyl ether, 4,4′-diamino diphenyl sulfone, and 3,3′-diamino diphenyl sulfone, was followed by differential scanning calorimetry (DSC). The enthalpy change and the kinetic constants for the polymerization reactions were evaluated from the DSC curves. Thermal stability of the cured polymers was studied by thermogravimetry (TG). The kinetic parameters, viz., activation energy E and preexponential factor A, for the thermal decomposition of the cured bismaleimides were calculated from the TG curves using three nonmechanistic integral equations. The kinetic constants (E and A) follow a trend similar to the thermal stability of the polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320731
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  • 6
    Electronic Resource
    Electronic Resource
    IR spectral changes of bovine serum albumin upon surface adsorption (1989)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 23 (1989), S. 549-569 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The adsorption of bovine serum albumin from flowing solutions onto germanium and three polyetherurethanes varying in soft segment content was studied by a Fourier transform infrared/attenuated total reflectance technique. Spectral differences observed in the amide I, II, and III regions upon adsorption to all four surfaces were consistent with a loss of helix and gain of β-structure. There appeared to be a slight difference between BSA adsorbed to germanium and the PEUs, but no distinction could be made between BSA adsorbed to the different PEUs.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820230603
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  • 7
    Electronic Resource
    Electronic Resource
    Thermoanalytical Investigations on the Effect of Atmospheric Oxygen on HTPB resin (1996)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 21 (1996), S. 199-202 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: TG-DSC studies, carried out on hydroxy-terminated polybutadiene (HTPB) in air and nitrogen atmospheres show three transitions which give rise to (1) an exothermic DSC peak and mass gain in TG at 170°C-240°C, seen only in air (2) exothermic peak and low mass loss, both in air and nitrogen, due to depolymerization, cyclization and cross linking, and (3) final mass loss corresponding to pyrolysis in nitrogen and combustion in air, appearing respectively as an endothermic peak and as a sharp exothermic peak in the two atmospheres. The FTIR spectrum of the product isolated from TG after the mass gain step shows addition of oxygen to the butadiene back bone. Arrhenius activation parameters (E and A) were computed for the exothermic oxygen addition reaction. The Ozawa method refined by MKN two-term approximation for p(x) function gave results quite comparable to those from Kissinger method.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19960210408
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