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  • Wiley-Blackwell  (4,352)
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  • 1
    Electronic Resource
    Electronic Resource
    Secondary ion mass spectrometry round-robin study of relative sensitivity factors in gallium arsenide (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 144-154 
    Details
    ISSN: 0142-2421
    Keywords: SIMS ; GaAs ; round-robin ; sensitivity factor ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Round-robin studies on relative sensitivity factors (RSFs) in secondary ion mass spectrometry (SIMS) were conducted using bulk GaAs samples uniformly doped with various impurity elements. A total of 31 laboratories participated in two round-robins. More than 30 sets of relative ion intensities were obtained for B, Si, Cr, Mn, Fe, Cu, Zn, In and Te in GaAs. The RSFs for both positive and negative ions were derived for several types of SIMS instruments. The effect of primary ion incident angle was examined using quadrupole-based instruments and found to be the determining factor of the instrumental dependence of RSF. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Microsegregated structure in the regenerated silk fibroin film from bombyx mori (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 2567-2571 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090251211
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  • 3
    Electronic Resource
    Electronic Resource
    Changes of lipase-catalyzed lipolytic rates in a batch reactor (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 39 (1992), S. 1128-1132 
    Details
    ISSN: 0006-3592
    Keywords: lipolytic rates ; hydrolysis ; tributyrin ; Candida rugosa ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A dramatic change of the reaction rate was observed for the lipase-catalyzed hyrolysis of tributyrin in a batch reactor. Immediately after the addition of the enzyme, the lipolysis rate increased continuously until a maximal reaction rate was reached. The duration of the induction was mainly controlled by the bulk enzyme concentration and the reactor stirring speed. The reaction rate dropped sharply after reaching its maximal value. The lipolysis decayed at a rate of about 0.012 min-1, and was not affected by changes of the stirring speed. This decay was attributed to the fast deactivation of the surface-adsorbed lipase, and possibly to the extremely slow desorption of the inactivated species. For reaction time longer than 120 minutes, the lipolysis decreased at a much slower rate. Several mechanisms for the decay of the lipolysis rate were discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260391108
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  • 4
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, II. Compatibility and morphologyPart I cf.10. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 15-22 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Die dynamisch-mechanischen Eigenschaften und die Morphologie dieser IPN wurden untersucht. Dabei zeigte sich, daß PU/GEPF IPN eine Mehrphasen-Morphologie aufweisen. Mit PU sowohl auf Polyesterpolyol- als auch auf Polyetherpolyol-Basis zeigten die dynamisch-mechanischen Analysen (DMA) verschiedene Verschiebungen der Verlustmoduli (E″) der Hoch- und Niedertemperaturübergangsbereiche in Abhängigkeit von Typ und Molekulargewicht der im PU verwendeten Polyol-Komponente. Drei verschiedene übergangsbereiche konnten bis zu einem bestimmten PU-Gehalt beobachtet werden.
    Notes: The interpenetrating polymer networks (IPN) of polyurethanes (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were prepared by a simultaneous polymerization method. The dynamic mechanical properties and morphologies of the IPNs were investigated. It was found that multiphased morphology was formed in the PU/GEPF IPNs. With the PU based on polyester- or polyether-type polyols, the dynamic mechanical analysis (DMA) of these IPNs exhibited various shifts in the loss moduli (E″) of the high and low temperature transition domains depending upon the types and molecular weights of the polyols employed in the PU. Three distinct transition domains were observed as the PU content increased up to a certain level.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940102
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  • 5
    Electronic Resource
    Electronic Resource
    Study of the structure and properties of phosphorinated segmented polyurethanes (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 121 (1984), S. 159-169 
    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: Der Einfluß einer Folge von gestreckten physikalischen Bindungen in steifen Polyurethanblöcken wurde durch Röntgenstreuungs-, thermographische und thermomechanische Messungen untersucht. Es wurde gezeigt, daß durch Variieren der Art und Struktur des quaternierenden Agens die Struktur und Eigenschaften von Polyurethanblöcken gezielt geändert werden kann, Hitzebehandlung (Tempern) des Polyurethans und der Polyurethanionomerproben hat bewiesen, daß das Wachsen der harten Bereiche vor allem darauf beruht, daß steife Segmente sich an schon vorhandene Hart-Domänen anlagern.
    Notes: The effect of an expanded set of physical bonds in rigid polyurethane segments has been studied by X-ray measurements, thermography, thermomechanics, etc. It has been shown that, by varying the nature and structure of quaternizing agent, the structure and properties of the segmented polyurethanes can be purposefully varied. Heat treatment (annealing) of polyurethanes, and polyurethane-ionomer samples has proved that the growth of hard domains is first of all due to the rigid segments associating with hard domains already existing.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051210115
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of rigid domains and viscoelastic properties of ion-containing polyurethane semicarbazides (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 126 (1984), S. 125-143 
    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: Unter Verwendung von Röntgenkleinwinkelstreuung, thermomechanischer Analyse und Spannungsrelaxation bei konstanter Deformation wurde der Einfluß verschiedener Quaternierungsmittel auf die Strukturbildung in kationenaktiven, segmentierten Polyurethanen untersucht. Die erhaltenen Ergebnisse wurden zur Aufstellung eines Modells für die steifen Domänen benutzt, nach dem diese Domänen aus einem komplexen Teilchen aus Hartblock-Mikroassoziaten bestehen. Die Hartblock-Mikroassoziate werden durch Dipol-Dipol-, Dipol-Ionen- und Ionen-Ionen-Wechselwirkungen gebildet. Die optimalen viscoelastischen und thermomechanischen Eigenschaften erhält man, wenn ein Teil der tertiären Stickstoffatome unquaternisiert bleibt.
    Notes: By using small-angle X-ray scattering, thermo-mechanical analysis, stress relaxations under constant deformation, etc. the effect of different quaternizing agents on the structure formation in cation-active segmented polyurethanes was investigated.The results obtained have been used for developing a model of a rigid domain, according to which the domain is a complex particle consisting of hard block microassociates. The hard block microassociates result from dipole-dipole, dipole-ion, and ion-ion interactions.The optimum viscoelastic and thermomechanical characteristics of polyurethane ionomers of the given chemical structure are realized when a part of tertiary nitrogen atoms remains unquaternized.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051260114
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  • 7
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, I. Mechanical behavior (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 193 (1991), S. 89-98 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Der Einfluß des PU-Molekulargewichts und -Gehalts auf die mechanischen Eigenschaften wird diskutiert. Bei PU/GEPF IPN aus Polyester-Typ-PU nahmen mit steigendem PU-Gehalt sowohl die Zugfestigkeit als auch die Bruchenergie ab, während die Schlagfestigkeit signifikant anstieg. Demgegenüber zeigten PU/GEPF IPN aus Polyether-Typ-PU eine sinkende Heterogenität mit abnehmendem Molekulargewicht der Polyetherpolyol-Komponente im PU und dementsprechend eine Zunahme sowohl der Zugfestigkeit als auch der Bruchenergie. Die Schlagfestigkeit zeigte dagegen mit steigendem PU-Gehalt zunächst einen Anstieg zu einem Maximalwert, um dann wieder abzufallen.
    Notes: The interpenetrating polymer networks (IPNs) prepared from polyurethane (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were synthesized by using a simultaneous polymerization method. The effects of PU molecular weight and amount on the mechanical property are discussed. For the PU/GEPF IPNs based on polyester-type PU, as the PU content was increased, the tensile strength and fracture energy decreased, but the impact strength increased significantly. However, for the PU/GEPF IPNs based on polyether-type PU, the extent of heterogeneity was decreased with decreasing molecular weight of polyether polyol in PU and the tensile strength and fracture energy were enhanced. The impact strength increased to a maximum value and then decreased when the PU content was further increased.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051930109
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  • 8
    Electronic Resource
    Electronic Resource
    Positron annihilation in amine-cured epoxy polymers - pressure dependence (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1431-1441 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Positron annihilation spectroscopy has been used to study free volume in an arnine-cured epoxy as a function of external pressure at temperatures above and below the glass transition temperature. The observed ortho-positronium lifetime τ3 and formation probability I3 decreased with increasing pressure. The decrease in τ3 is interpreted in terms of a corresponding decrease in average free-volume hole size over the range from 0.135 to 0.045 nm3. The fractional free-volume and the free-volume compressibility in the epoxy are calculated as functions of pressure at 100°C.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090280902
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  • 9
    Electronic Resource
    Electronic Resource
    Electrofusion for the pronuclear transplantation of mouse eggs (1987)
    New York, NY : Wiley-Blackwell
    Gamete Research 17 (1987), S. 15-20 
    Details
    ISSN: 0148-7280
    Keywords: nuclear transplantation ; electrofusion ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The present study was undertaken to determine the efficiency of HVJ treatment and electrofusion for pronuclear transplantation in the mouse. The output voltage and duration of the pulses were fixed to 200 μsec at 10 V or to 150 μsec at 15 V for electrofusion, because the maximum rates of blastomere fusion of 2-cell embryos and development of fused embryos in vitro were obtained under these conditions. Although the proportion of eggs with fused karyoplast (78%) and the fused eggs developed to morulae or blastocysts (67%) was significantly lower than those obtained after HVJ treatment (94% and 94%), the proportion of pregnant recipients and young obtained after treatment of fused eggs was not significantly different between these two procedures.It is advised that electrofusion can be used as a fusogenic procedure for pronuclear transplantation in the mouse in some cases where HVJ cannot be applied.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120170103
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  • 10
    Electronic Resource
    Electronic Resource
    Investigations on nylon 4 membranes. Synthesis and transport properties. I. Synthesis of nylon 4 polymerPresented at the IUPAC 26th International Symposium on Macromolecules, Mainz, West Germany, September 17-21, 1979. (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1135-1142 
    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 synthesis of nylon 4 (polypyrrolidone) by the anionic polymerization of 2-pyrrolidone through the use of the CO2/potassium pyrrolidonate catalyst system for use in preparing polymer membranes for separation purposes was investigated in detail. The effects of the quantity of CO2, the potassium pyrrolidonate catalyst, and the reaction temperature on the yield and molecular weights of the nylon 4 were studied. At reaction temperatures of 50°C and a reaction time of 120 hr, a yield of 50.9% with intrinsic viscosity of 4.42 (corresponding to Mn of 108,200 and Mw of 135,850) was obtained. The molecular weight distributions of the nylon 4 were determined by gel permeation chromatography (GPC) using m-cresol as the eluting solvent and were found to have a relatively narrow distribution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260407
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