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  • Polymer and Materials Science  (265)
  • Electronic structure and strongly correlated systems  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Elektrochemische Untersuchung von inhibitorhaltigen Lösungen für zeitweiligen Korrosionsschutz (1969)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 206-208 
    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: Electro-chemical examination of solutions containing inhibitors for temporary corrosion protectionThe products of lubricant type hitherto mainly used for temporary corrosion protection are increasingly superseded by aqueous solutions. Potentiostatic examinations have shown that solutions containing ammonium oxalate, sodium oxalate or sodium nitrite  -  possibly with an admixture of starch or glycerine  -  are suitable for this purpose. The action mechanism shows fairly great differences. Whilst the inhibiting effect of sodium oxalate is confined to the cathodic reaction, the effect of ammonium oxalate also extends to the anodic reaction. Ammonium oxalate is much more effective than sodium nitrite. It has not yet been possible to establish with certainty whether the protective effect is due to the formation of an oxa-late film, or to the adsorption of the oxalate ions, or to the reaction with oxygen.
    Notes: Statt der bisher meist verwendeten schmierstoffähnlichen Produkte fü den zeitweiligen Korrosionsschutz finden zunehmend wäßrige Lösungen Anwendung. Potentiostatische Untersuchungen haben gezeigt, daß Lösungen mit Ammoniumoxalat, Natriumoxalat oder Natriumnitrit, gegebenenfalls mit Zusatz von Stärke oder Glycerin, für diesen Zweck geeignet sind. Der Wirkungsmechanismus ist ziemlich verschieden. Während Natriumoxalat nur die kathodische Reaktion inhibiert, erstreckt sich die Wirkung von Ammoniumoxalat ist dabei wesentlich wirksamer als Natriumnitrit. Ob die Schutzwirkung bedingt ist durch Bildung einer Oxalatschicht, Adsorption der Oxalation oder Bindung von Sauerstoff, konnte noch nicht eindeutig entschieden werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19690200305
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  • 2
    Electronic Resource
    Electronic Resource
    Peculiarities of the thermomechanical behaviour of polybutadiene-poly(butadiene-co-styrene) blends (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 39-42 
    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: Das thermomechanische Verhalten einiger Polybutadien-Poly(butadien-co-styren)-Mischungen wurde untersucht. Eine Methode zur Vorhersage der Glasübergangstemperatur der Mischungen auf Basis der Ergebnisse der thermomechanischen Analyse wird vorgeschlagen.
    Notes: The thermomechanical behaviour of some polybutadiene-poly(butadiene-co-styrene) blends has been investigated. A method for the prognostication of glass transition temperature of the blends based on the data of thermomechanical analysis is proposed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420111
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  • 3
    Electronic Resource
    Electronic Resource
    Thermostimulated depolarization currents in thermorheologically simple materials (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 969-979 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A theory is presented which makes possible the calculation of the dielectric parameters for a distributed dipole relaxation from thermostimulated depolarization current (TDC) data. The theory is applicable to dielectrics which obey the time-temperature superposition principle, i.e., for thermorheologically simple materials. The shift factor, the activation energy, the dielectric relaxation strength, the density of the isothermal displacement current, and the distribution function of relaxation times of the β relaxation in poly(methyl methacrylate) are calculated. The TDC investigations were carried out over the temperature range of -136 to 90°C. The values for the activation energy U = 26.4 kcal/mole and the dielectric relaxation strength Δ∊β = 2 are in good agreement with values obtained from dynamic measurements. A criterion for checking the validity of the time-temperature superposition principle by TDC is suggested.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180150604
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  • 4
    Electronic Resource
    Electronic Resource
    A method for experimental determination of the temperature dependence of relaxation times in dielectrics (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1467-1479 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new method is suggested for the experimental determination of the dependence of the relaxation times on the temperature in dielectrics for which the time-temperature superposition principle is valid. The method makes possible the determination of this dependence for a separate relaxation process (for instance, for the β-relaxation process) over a wide temperature range by means of comparatively simple mathematical operations which are only slightly sensitive to experimental errors. Two or more discharge-current curves, measured with temperatures increasing in an arbitrary way with time, are used for this purpose.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130801
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  • 5
    Electronic Resource
    Electronic Resource
    A method for the evaluation of the activation energy from relaxation experiments (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 1801-1812 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A method is proposed for calculating the activation energy over the entire temperature range from relaxation measurements at two frequencies as a function of temperature by taking into account the entire experimental curve. The method is independent of the distribution of relaxation times, but assumes the validity of the time-temperature superposition principle.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180141006
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  • 6
    Electronic Resource
    Electronic Resource
    Über peptidsynthesen, 32. Mitt.31. Mitt.: TH. WIELAND und H. BENDE, Chem. Ber. 98 (1965) 504; Beginn der Serie: TH. WIELAND, W. KERN und R. SEHRING, Liebigs Ann. Chem. 569 (1950) 117. Der γ-hydroxy-isocaproyl- und der 3-nitrophenoxycarbonylrest als schutzgruppenVorgetragen beim 7. Europ. Peptidsymposium in Budapest, 4.-8. Sept. 1964.Herrn Professor Dr. W. KERN zum 60. Geburtstag gewidmet (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 92 (1966), S. 277-286 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N-Hydroxyisocaproyl (HIC) amino acids are obtained by heating glycine or leucine with isocaprolactone in molten imidazole. The N-protected acids were coupled with leucine methylester respectively tyrosine benzylester using the mixed anhydride method. The HIC-group can be removed as isocaprolactone by 50 percent trifluoro-acetic acid during several hours at room temperature. 3-Nitrophenoxycarbonyl-chloride (3-NPOC-chloride), synthesized from 3-nitrophenol and phosgene was reacted with phenylalanine to give the 3-NPOC-derivative. This has been coupled with glycin-methylester and with glycyl-alanine benzylester. The 3-NPOC-group can be split off by irradiation with light of λ- 290 mμ or with weak alcali, but in case of peptide derivatives only ninhydrine-negative products were formed.
    Notes: Aus Glycin- bzw. Leucin-natrium wurden durch Erhitzen mit Isocaprolacton in der Imidazolschmelze die N-γ-Hydroxyisocaproylderivate (HIC-Aminosäuren) erhalten. Nach der Anhydridmethode wurden sie zu HIC-Glycyl-leucinmethylester bzw. HIC-Leucyl-tyrosylbenzylester gekuppelt. Die Abspaltung des Restes als Isocaprolacton gelang z. B. durch mehrstündiges Aufbewahren der Peptidderivate in 50-proz. Trifluoressigsäure. Aus 3-Nitrophenol wurde mit Phosgen das 3-Nitrophenoxycarbonylchlorid (3-NPOC-Chlorid) hergestellt, das mit Aminosäuren in wäßriger Lösung in Gegenwart von MgO zu N-3-NPOC-Derivaten reagiert. Durch Peptidsynthese erhielt man 3-NPOC-Phenylalanyl-glycinmethylester und 3-NPOC-Phenylalanyl-glycylalanylbenzylester. Die Schutzgruppe läßt sich aus den Aminosäurederivaten durch Bestrahlen mit Licht von λ 〉 290 mμ oder durch schwaches Alkali abspalten, bei Peptiden entstehen bei dieser Abspaltung nur ninhydrinnegative Produkte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020920120
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  • 7
    Electronic Resource
    Electronic Resource
    Vectorial interpretation of spectra for the study of associationsThis work is part of the doctoral thesis of Ch. Marck (Université Paris VIII). (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 1065-1074 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: If one considers CD spectra as vectors, then a CD spectrum may be treated as a single parameter, every wavelength entering with the same weight. The representation of a set of spectra as a vector space and the problem of the linear independence of the concentrations are discussed. Three examples of vectorial interpretation are given: determination of the number of independent molecular species; determination of the stoichiometry of a complex; and graphical representation of the overall variation of a spectrum as a function of an external parameter.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360170419
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of a macroporous biodegradable polylactide implant for neuronal transplantation (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 1349-1362 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This article reports the production of a surgical implant meeting several specific requirements such as biocompatibility, biodegradability, macroporosity, and flexibility. Porosity was controlled by an original method consisting of the aggregation of calibrated poly-D,L-lactide microparticles. The size of the interstices between the aggregated microspheres was in a direct relationship to the microsphere diameter. A first approach was based on coating the microspheres with poly(vinyl alcohol) followed by chemically crosslinking the coating layers that were in mutual contact. This method was disregarded because of the acute cytotoxicity of glutaraldehyde used as the crosslinking agent, the absence of macroporosity, and the complete lack of flexibility. A physical technique of aggregation was then tested, which relied on the plasticization of poly-D,L-lactide microspheres with triethylcitrate to the point where microspheres strongly adhered to each other when they were in contact. This method has proved to be straightforward and definitely superior to the chemical approach, particularly with respect to cytotoxicity, control of macroporosity, and flexibility. A polymer support was thus successfully produced which was biodegradable, macroporous (interconnected pores of 10-100 μm in diameter), and flexible. This potential medical device is presently being used for neuronal transplantation in the central nervous system. © 1995 John Wiley & Sons, Inc.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820291106
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  • 9
    Electronic Resource
    Electronic Resource
    Polylactide macroporous biodegradable implants for cell transplantation. II. Preparation of polylactide foams by liquid-liquid phase separation (1996)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 30 (1996), S. 449-461 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Potential of thermally induced phase separation as a porogen technique has been studied in an effort to produce a surgical implant suitable for cell transplantation. Emphasis has been placed on the liquid-liquid phase separation of solutions of amorphous poly dl-lactide and semicrystalline poly l-lactide in an 87/13 dioxane/water mixture. The related temperature/composition phase diagrams have been set up by turbidimetry, and the possible occurrence of a gel has been discussed. Freeze-drying of some phase-separated polylactide solutions can produce flexible and tough foams with an isotropic morphology. Interconnected pores of 1-10 μm in diameter are expected to result from the spinodal decomposition of the polylactide solutions with formation of co-continuous phases.Thermodynamics of the polymer/solvent pair has a decisive effect on the final macroporous foams, as shown by the dependence of their porosity, density, porous morphology, and mechanical behavior on molecular weight and crystallinity of polylactide and concentration of the original solutions. On the basis of the foam characteristics, potential of the liquid-liquid phase separation (spinodal decomposition) has been compared with the solid/liquid phase separation (solvent crystallization) as a porogen technique. © 1996 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Endothelial cell compatibility testing of three different Pellethanes (1993)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 27 (1993), S. 1367-1381 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: There is a need for viable small diameter vascular grafts, the luminal surface of which could be seeded by endothelial cells (ECs) to prevent thrombosis. In order to select candidates for EC seeding before implantation, the in vitro cytocompatibility of three different Pellethanes® (polyetherurethanes) using human ECs was investigated. The methodology included two stages depending on either direct contact between cells and materials or contact between cells and material extracts, obtained under standardized conditions. By the latter method, we observed a cytotoxic effect on cell growth with 2363-55 D Pellethane extract at a 50% (v/v) concentration in the nutrient medium, likely provoked by leachables and correlated with the lowest levels of tPA, PAI1, and vWF antigens in the supernatants. By the former method, we studied EC attachment and growth. Morphology was studied by classical means and completed by scintigraphy and microautoradiography after 111Indium-labeling of the EC monolayer. Differentiation was determined by the release of vWF antigen and measurement of vWF activity (multimeric organization) after human thrombin stimulation. Despite an inhibition of proliferation for both 55 D and 75 D types (compared to the control), a functional monolayer of ECs was obtained on 75 D. Pellethane 75 D could be the best support for in vitro endothelialization. © 1993 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820271104
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