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  • 1
    Electronic Resource
    Electronic Resource
    Molecular configuration of amylose and its complexes in aqueous solutions. Part II. Relation between the DP of helical segments of the amylose-iodine complex and the equilibrium concentration of free iodine (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 5-16 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The iodine which is added to an aqueous amylose solution is bound only partly by the amylose while forming the blue complex and partly remains free. The equilibrium normality of the free and the bound iodine at half-saturation of amylose by iodine is designated as [If]v and [Ib]w, respectively. The stability of the poly iodine chain formed within the axis of amylose helices depends on its length, i.e., indirectly on the DP of the amylose helices: the greater this stability, the lower the [If]v value. The amylose molecule consists of helical segments. Such a molecule may behave as a random coil. The average length of the helical segments in freshly prepared amylose-iodine complexes depends on temperature, pH, iodide concentration, the presence of other complex-forming agents, and the DP of the amylose. This latter factor is investigated in the present paper. By the aid of an automatically recording photometrictitrating device the coherent values of [Ib] and [If] were determined. Plotting these values against DPn for mechanochemically degraded as well as for periodateo-xidized amyloses resulted in curves consisting of two linear sections. The break of the curves occurred between DPn 110 and 130. It was concluded that below DPn = 100 the DP of helical segments (= sDPn) is identical to the DPn of the total molecule, i.e., the molecule consists of only a single, relatively stiff helix. Above this limit the molecule contains several helical segments. The DP of these helical segments can be calculated as follows: sDPn = 141.1 - 10.2 × 105[If]v. This equation is considered to be valid for 0.5-0.6 mg. amylose in 100 ml. 0.1N HCl at 20°C., λ = 650 mμ, euuvet diameter 3.4 cm., the feed rate of the iodate-iodide titrating solution (in acid medium resulting in a 5 × 10-3N I2 solution with a molar iodide to iodine ratio of 1.5) is 0.4ml./min. Amylose molecules of, e.g., DPn = 1380 consist of an average of 11.4 segments having a DP of about 120 and consisting of an average of 15-18 helical turns.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360050103
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular configuration of amylose and its complexes in aqueous solutions. Part III. Investigation of the DP distribution of helical segments in amylose-iodine complexes (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 17-26 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The equilibrium normality [If] of free iodine in amylose-iodine complex formation is a function of the length of the polyiodine chains. This length depends on the DP of helical segments of amylose (sDPn). Values of [If] and of the concentration of the bound iodine [Ib] were determined by the continuous photometric titration with automatic recording. Plots of [Ib] versus [If] give an integral distribution curve. Since the relation between [If] and sDPn is known, the graphic differentiation of the [Ib] versus [lf] curve furnishes the differential distribution curve, representing the mass distribution of the helical segments according to their DP. The peak of this curve is characteristic of the percentage and DP of those helical segments, which occur in the largest amount. On the basis of the differential distribution curve the polymolecularity of the investigated sample may be judged. The titration of amylose samples degraded by various methods gives different distribution curves. Titrating mixtures of samples with widely differing average DP values results in differential curves having more than one maximum.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360050104
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular configuration of amylose and its complexes in aqueous solutions. Part IV. Determination of DP of amylose by measuring the concentration of free iodine in solution of amylose-iodine complex (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 27-41 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In aqueous solutions of the amylase-iodine complex the concentration of free iodine [If]v after reaching equilibrium (or closely approximating it) is determined by the following factors: temperature, pH, concentration of iodide ions and amylose, and DP of amylose. In the present paper the role of temperature, amylose concentration, and DP has been investigated. At half-saturation of amylose by iodine, the reciprocal value of free iodine defines the equilibrium constant: 1/[If]v = K. The relation between [If]v, in normality and temperature is the following: 5 + log [If]v = -(2.132/T) + 8.52, for DPn = 1290, 0.4 mg. amylose in 100 ml. 0.1N HCl. The value of the energy of activation Ea between 2 and 52°C. is 9.72 kcal./mole. The influence of amylose concentration [Am] on photometrically determined [If]v, at 20°C, in the range of 0.1-1.2 mg./100 ml. 0.1 N HCl for DPn = 1290 is: 5 + log [If]v = 0.209 - 0.047 log [Am]. At [Am] = 0.6 mg. amylose/ 100 ml. 0.1 N HCl and 20°C, the value of [If]v depends on DPn as follows: 5 + log [If]v = 0.085 = + 0.222 log (104/DPn). These above equations are summarized by the relation: [If]v = exp {16.865 - (Ea/RT)}[Am]0.047(104/DPn)0.222 ×10-5 Considering that the determination of [If]v by automatic photometric titration can be performed quickly and with appropriate reproducibility, this method is convenient for a rapid empirical and approximate determination of DP of amylose on a microscale. The iodine-binding capacity [IBC] as well as the value of λmax, have been also investigated as functions of DPn, by photometric and by amperometric titration.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1968.360060103
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular configuration of amylose and its complexes in aqueous solutions. IV. Determination of DP of amylose by measuring the concentration of free iodine in solution of amylose-iodine complex (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 1777-1777 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1968.360061215
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  • 5
    Electronic Resource
    Electronic Resource
    Simultane Entfernung von SO2 und NOx unter den Bedingungen der Rauchgasreinigung von KraftwerkenVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 26. bis 28. September 1979 in Nürnberg. (1980)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 52 (1980), S. 456-457 
    Details
    ISSN: 0009-286X
    Keywords: Rauchgasentschwefelung ; NOx-Reduktion ; Adsorption ; heterogene Katalyse ; Aktivkoks ; Schwefeldioxid ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330520529
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  • 6
    Electronic Resource
    Electronic Resource
    Chemische synthese verzweigter polysaccharide, 5.1. bis 4. Mitteilung: cf.1-3. Kopplung von oligosacchariden und amylose an verschiedene träger durch hydrazonbindung (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 301-312 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The coupling of glucose and maltooligomers by hydrazone linkage to carriers by means of acid hydrazide groups was investigated. The following carriers were used: (1) linear polymers such as (a) poly(ethylene glycol) with carboxymethyl (CM) end groups, (b) CM-amylose and CM-cellulose, 6-COOH amylose and 6-COOH cellulose, pectic acid, alginic acid, poly(acrylic acid); (2) multifunctional centers such as (c) CM-cyclodextrin, 1,3,5-benzenetricarboxylic acid, 1,3,4,5-benzenetetracarboxylic acid, crosslinked poly(acrylamide) (BIO-GEL). The hydrazone linkage which is formed preferably in borate buffer at pH 8,5 was stable above pH 6 and could be split by mild acid treatment at pH 4. Maltooligomeric grafts of degree of polymerization DP ≧ 4 may be extended enzymatically by phosphorolytic synthesis to amylose chains of variable length. Primer activity of the bound maltooligomers for phosphorylase was obviously not hindered by the hydrazone linkage, by free hydrazide groups, or by synthetic polymers as carriers. ABA-Block copolymers may be derived from(a), comb-like molecules from (b), and different kinds of star-like molecules from (c).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790204
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction of rheological behavior of branched polyethylene from molecular structure (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1001-1014 
    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 general description of steady shear melt viscosity as a function of shear rate for polyethylene, containing any level of long chain branching, in terms of molecular structure is reported. A model, developed previously by B. H. Bersted for the prediction of rheological properties from the molecular structure of linear materials, and which has been subsequently modified by Ram and Pedersen for application to highly branched low-density polyethylene, is extended to describe the flow behavior of branched high-density polyethylene. The description of the branched high-density polyethylenes, which characteristically show dramatic viscosity enhancement relative to linear polyethylene, is effected by considering these materials to be blends of branched and linear species. A logarithmic rule of mixtures was found adequate at all shear rates for the description of blends of branched and linear materials.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260323
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  • 8
    Electronic Resource
    Electronic Resource
    Ermittlung des Bruchwiderstands an Oxidkeramik und Hartmetallen mit verschiedenen Methoden (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 167-174 
    Details
    ISSN: 0933-5137
    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: Fracture Toughness Determination of Alumina and Cemented Carbide with Different Testing MethodsFracture toughness of a sintered alumina and two tungsten carbidecobalt materials was determined using four-point-bend specimens with straight through and chevron notches and with the short rod specimen. With the specimens with a straight through notch a lower KIc was measured for Al2O3 and a higher for WC-Co compared to the chevron-notched specimens. This behavior was explained by the different shapes of the crack growth resistance curves and the different critical notch radii. For Al2O3 a steeply rising crack growth resistance curve was measured in a controlled fracture test, for WC-Co a flatter curve was obtained. The effect of the shape of the crack growth resistance curve and of notch width on the evaluated toughness is discussed.
    Notes: An einem gesinterten Aluminiumoxid und zwei WC-Co-Hartmetallen wurde der Bruchwiderstand im Vierpunkt-Biegeversuch mit Flachkerben und Spitzkerben sowie mit der kurzen Rundprobe mit Spitzkerbe bestimmt. Bei Al2O3 ergab sich mit den Flachkerbproben ein kleinerer Wert als mit den Spitzkerbproben, bei WC-Co war es umgekehrt. Dieses Verhalten wurde auf die unterschiedliche Form der Rißwiderstandskurve und die unterschiedliche Größe der kritischen Kerbradien zurückgeführt. Bei Al2O3 wurde im kontrollierten Bruchversuch eine stark ansteigende, bei WC-Co eine flache Rißwiderstandskurve gemessen. Der Einfluß der Form der Rißwiderstandskurve und der Kerbbreite auf die ermittelten Kennwerte wird diskutiert.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120507
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  • 9
    Electronic Resource
    Electronic Resource
    Physikalische Eigenschaften von CuNi 10 Fe 1 Mn und CuNi 30 Mn 1 Fe unter besonderer Berücksichtigung des Ausscheidungsverhaltens (1986)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 17 (1986), S. 273-280 
    Details
    ISSN: 0933-5137
    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: Influence of Precipitation Process on the Physical Properties of the Cu—Ni-Alloys CuNi 10 Fe 1 Mn and CuNi 30 Mn 1 FeThe following physical properties were measured on six heats of CuNi 10 Fe 1 Mn and seven heats of CuNi 30 Mn 1 Fe: density, Young's modulus, Poisson's ratio, thermal expansion, specific heat capacity, electrical resistivity, thermal conductivity, thermal diffusivity, thermoelectric voltage, saturation magnetization and magnetic permeability. In addition the variation of the values within different heats and different specimens were evaluated. The influence of precipitates varied depending on thermal treatment. The measurement of electrical resistivity and the magnetic properties are useful to evaluate the thermal treatment of CuNi 10 Fe 1 Mn especially after rapid cooling.
    Notes: An sechs Schmelzen aus CuNi 10 Fe 1 Mn und sieben Schmelzen aus CuNi 30 Mn 1 Fe wurden folgende physikalische Größen - zumeist auch ihre Temperaturabhängigkeit - untersucht: Dichte, Elastizitätsmodul, Querkontraktionszahl, Wärmeausdehnung, Wärmekapazitat, spezifischer elektrische Widerstand, Wärmeleitfähigkeit, Temperaturleitfähigkeit, Thermospannung, spezifische Sättigungsmagnetisierung und Permeabilität. Darüber hinaus wurde die schmelzen- und probenbedingte Streuung der Meßwerte bei Raumtemperatur ermittelt. Durch Wahl verschiedener Wärmebehandlungszustände konnte der Einfluß der Ausscheidungen auf die jeweiligen physikalischen Größen festgestellt werden. Zur Beurteilung des Wärmebehandlungszustandes von CuNi 10 Fe 1 Mn, hinsichtlich einer hinreichend schnellen Abkühlung, sind neben der Messung des elektrischen Widerstandes besonders die ferromagnetischen Eigenschaften, die spezifische Sättigungsmagnetisierung und die Permeabilität, geeignet.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19860170805
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  • 10
    Electronic Resource
    Electronic Resource
    Der Einfluß von thermozyklischer Beanspruchung auf den Eigenspannungszustand in elektronenstrahlgedampften Wärmedämmschichten aus Zirkonoxid (1995)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 493-500 
    Details
    ISSN: 0933-5137
    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: Influence of Thermal Cycling on Residual Stresses in Zirconia Thermal Barrier Coatings Produced by Electron Beam - Physical Vapor Deposition.Flat specimens and aircraft turbine engine blades were coated with partially stabilized zirconia by electron beam - physical vapor deposition. Residual stresses of these thermal barrier coatings were measured before and after thermal cycling by x-ray stress analysis. All flat specimens and blades showed compressive residual stresses. Stress values in the longitudinal direction were significantly greater than those measured in the transverse direction. No changes of stress states and line widths were observed after thermal cycling. The specimens showed considerable differences in texture which made evaluation of the stress measurements difficult and which may have influenced degradation behaviour during thermal cycling.
    Notes: Flachproben und Turbinenschaufeln für Flugtriebwerke wurden mit electronenstrahlgedampften Wärmedämmschiehten aus teilstabilisiertem Zirkonoxid beschichtet. Der Eigenspannungszustand vor und nach Thermowechselbelastung wurde rötgenografisch bestimmt. An allen Flachproben und Schaufeln wurden Druckeigenspannungen gemessen. Die Eigenspannungen waren in Probenlängsrichtung signifikant höher als in der Querrichtung Eine Änderung des Eigenspannungszustandes als Folge der thermozyklischen Beanspruchung wurde nicht beobachtet. Die Proben wiesen stark unterschiedliche Texturzustände auf, welche die Auswertung der Eigenspannungsmessung und möglicherweise auch das Schichtverhalten gegenüber thermozyklischer Beansprunchung beeinflußten.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19950260907
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