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  • 1
    Electronic Resource
    Electronic Resource
    Dielectric changes in hyaluronate solutions at microwave frequencies as a function of concentration, system pH, and temperature (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 931-944 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dielectric response of human umbilical cord hyaluronic acid in various environments has been studied at microwave frquencies using a resonant microwave cavity as a probe. Both the real and imaginary parts of complex dielectric constant and the loss tangent for hyaluronate solutions are obtained by utilizing equations for perturbation of a resonant cavity. Dielectric changes at room temperature have been observed in aqueous solutions of hyaluronic acid as a function of concentration ranging from 0 to 350 mg/ml. The data indicate the existence of ordered phases in hyaluronate solutions at selective concentrations, that is, exhibiting lyotropic-type transitions. Hyaluronate solutions at 1.5 and 3 mg/ml concentrations have been studied at various pH in the range of 6-8 and at constant ionic strength 0.1. A temperature-dependent transition in hyaluronate solution of 120 mg/ml concentration has been observed at physiological temperature. It is shown that this temperature-dependent behavior can be related to the orientational polarizability term in the Debye theory of polar molecules in liquids.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1980.360190415
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  • 2
    Electronic Resource
    Electronic Resource
    Compatibilization of the PBA/PMMA core/shell latex interphase. I. Effect of PMMA macromonomer (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3173-3181 
    Details
    ISSN: 0887-624X
    Keywords: macromonomer ; core/shell latexes ; interphase ; compatibilizing agent ; NMR relaxation studies ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this work poly(methyl methacrylate) (PMMA) macromonomer is used as a compatibilizing agent in a poly(butyl acrylate) (PBA)/PMMA core/shell latex system. The incorporation of the PMMA macromonomer was achieved by copolymerizing it with BA monomer using miniemulsion polymerization. PBA seed latex was also synthesized without the macromonomer present to compare the compatibilizing effects with the PMMA macromonomer. The second stage methyl methacrylate monomer was added semi-continuously to the PBA seed latexes under monomer-starved conditions. Solid-state 13C-NMR [H]T1ρ relaxation studies were used to determine the effect of PMMA compatibilizer on these PBA/PMMA core/shell latex interphase regions. The thickness of the interphase of the core/shell particles prepared with and without the PMMA macromonomer compatibilizing agent are calculated to be in the range of 15-16 nm and 10-12 nm, respectively. Electron microscopy revealed that the seed latex prepared with the PMMA macromonomer achieved a more uniform coverage with the second stage PMMA polymer as compared to the latex synthesized without the compatibilizing agent present. It is concluded that the PMMA macromonomer is effective in increasing the thickness of the interphase region and also the amount of interfacial PMMA. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Compatibilization of the PBA/PMMA Core/Shell Latex Interphase. II. Effect of PMMA Macromonomer (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 3183-3190 
    Details
    ISSN: 0887-624X
    Keywords: macromonomer ; core/shell latexes ; interphase ; compatibilizing agent ; NMR relaxation studies ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this work poly(methyl methacrylate) (PMMA) macromonomer is used as a compatibilizing agent in a poly(butyl acrylate) (PBA)/PMMA core/shell latex system. The incorporation of the PMMA macromonomer was achieved by copolymerizing it with BA monomer using miniemulsion polymerization. PBA seed latex was also synthesized without the macromonomer present to compare the compatibilizing effects with the PMMA macromonomer. The second stage methyl methacrylate monomer was added semi-continuously to the PBA seed latexes under monomer-starved conditions. Solid-state 13C-NMR [H]T1ρ relaxation studies were used to determine the effect of PMMA compatibilizer on these PBA/PMMA core/shell latex interphase regions. The thickness of the interphase of the core/shell particles prepared with and without the PMMA macromonomer compatibilizing agent are calculated to be in the range of 15-16 nm and 10-12 nm, respectively. Electron microscopy revealed that the seed latex prepared with the PMMA macromonomer achieved a more uniform coverage with the second stage PMMA polymer as compared to the latex synthesized without the compatibilizing agent present. It is concluded that the PMMA macromonomer is effective in increasing the thickness of the interphase region and also the amount of interfacial PMMA. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1996.869
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  • 4
    Electronic Resource
    Electronic Resource
    Micropipette sampling onto glass capillary columns (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 715-719 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Sample introduction ; Direct manual operation at the capillary inlet ; Micro pipette is coupled onto cold separation capillary ; PTFE connection used ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021204
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  • 5
    Electronic Resource
    Electronic Resource
    Münchener Chemische Gesellschaft (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 112-113 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19570690326
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Ring-Inversion bei Cycloheptan- und Cyclohepten-DerivatenHerrn Professor Georg Wittig zum 70. Geburtstag gewidmet (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 577-578 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670791211
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  • 7
    Electronic Resource
    Electronic Resource
    Anwendungen der kernmagnetischen Resonanzspektroskopie in der organischen ChemieVeröffentlichung Nr. 2909 aus den Gates and Crellin Laboratories of Chemistry. Nach Vorträgen auf dem Butlerov-Symposium am 14. Dezember 1961 in Leningrad und anläßlich des 65. Geburtstags von Prof. G. Wittig am 16. Juni 1962 in Heidelberg. (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 20-27 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Anwendung physikalischer Methoden hat im Lauf der letzten Jahre die Arbeitsweise des organischen Chemikers weitgehend verändert. In diesem Zusammenhang ist besonders die kernmagnetische Resonanzspektroskopie zu nennen. Es gibt so viele Veröffentlichungen, die sich mit ihrer Anwendung auf Probleme der organischen Chemie befassen, daß in einer kurzen Übersicht nur wenige typische Beispiele beschrieben werden können. Nach einer allgemeinen Einleitung werden einige besonders interessante Fragen der Struktur und Dynamik organischer Verbindungen diskutiert, die mit Untersuchungen in den Laboratorien des Autors zusammenhängen.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19630750105
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of the interphase in poly(divinylbenzene)/poly(N-butyl acrylate) core/shell latexes by high-resolution solid-state NMR relaxation studies (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 323-330 
    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: Poly(divinylbenzene)/poly(n-butyl acrylate) core/shell latexes were investigated using solid-state 13C-NMR. The (H)T1ρ relaxation time was found to be substantially affected by many of the seeded emulsion polymerization parameters, such as the core/shell ratio, the mode of addition of the second-stage monomer, the addition rate of the second-stage monomer, and the level of conversion of the seed latex at the time of addition of the second-stage monomer. The existence of an interphase region between the core and shell polymers was detected. Maximum interphase region thickness was achieved when the butyl acrylate was added under starved conditions. The thickness of this interphase layer was calculated to be 5-7 nm based on a model proposed by McBriety.1 Solid-state NMR was found to be an excellent spectroscopic technique to probe the interphase region in core/shell latexes. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580212
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  • 9
    Electronic Resource
    Electronic Resource
    The sward number and mechanical properties of plastics (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1343-1350 
    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: A Sward rocker tester is used to obtain the Sward number for glass, mild steel, copper, poly(methyl methacrylate), polyethylene of various densities, and natural rubber. A relationship between the number and mechnical properties is investigated. It is shown that with metals and glass the number is essentially a frictional factor. With plastics and rubber it is a true hardness factor, involving dynamic Young's modulus, Poisson's ratio, and damping capacity. The aim of the investigation is to encourage the development of the Sward test as a nondestructive quality test for plastics.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100912
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  • 10
    Electronic Resource
    Electronic Resource
    Structure of hygromycin B, an antibiotic from Streptomyces hygroscopicusPresented in part at the Ninth Interscience Conference on Antimicrobial Agents and Chemotherapy, Washington, D.C., October 27-29, 1969.; The use of CMR. spectra in structure determination, I (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 2314-2319 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Antibioticum Hygromycin B, eine Verbindung C20H37N3O13 aus Streptomyces hygroscopicus, wurde hydrolytisch gespalten und die Spaltprodukte charakterisiert und identifiziert. Die Kenntnis ihrer Struktur und die Interpretation von 13C-NMR.- (CMR.)- Spektren führten zur Strukturaufklärung des Antibiotikums.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530846
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