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  • Articles  (8)
  • Polymer and Materials Science  (8)
  • Chemistry and Pharmacology  (8)
  • Mathematics
  • 1
    Electronic Resource
    Electronic Resource
    Molecular dynamics of a hemoglobin crosslinking reaction (1996)
    New York : Wiley-Blackwell
    Biopolymers 39 (1996), S. 615-618 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Difluorocarbene modification of polymer and fiber surfaces (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1523-1535 
    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: Difluorocarbene (difluoromethylene, :CF2) generated by the pyrolysis of sodium chlorodifluoroacetate has been shown to irreversibly modify the surfaces of polymers and fibers. The critical surface tension values of several polymers are shown to decrease with increasing exposure to difluorocarbene vapors and ultimately approach the critical surface tension values of partially fluorinated polyethylenes. The rate-controlling step appears to be the diffusion of difluorocarbene from the precursor to the polymer substrate. The nature of the interaction between difluorocarbene and the polymer surface is unknown; however, the absence of infrared bands due to C—F bonds in attenuated total reflection measurements tends to establish the mono-molecular-like character of the modified surface.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130715
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  • 3
    Electronic Resource
    Electronic Resource
    Modification of polyethylene surfaces with carbethoxy substituted carbenes and nitrenes (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1537-1544 
    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: Carbethoxycarbene, carbethoxynitrene, and nitrene generated respectively by the pyrolysis of ethyl diazoacetate, ethyl azidoformate, chloramine and sodium hydroxyl amine-o-sulfonate are shown to irreversibly modify the surface of polyethylene as shown by wettability measurements. The nature of the modification is not fully understood; however, insertion of the carbene or nitrene into a carbon-hydrogen bond appears likely. The modified surfaces thus formed are shown to undergo several classical organic reactions as again determined by wettability measurements.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130716
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  • 4
    Electronic Resource
    Electronic Resource
    Voltammetric sensor for uranium based on the propyl gallate- modified carbon paste electrode (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 247-250 
    Details
    ISSN: 1040-0397
    Keywords: Uranium ; Sensor ; Remote sensing ; Field screening ; Modified electrode ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A carbon paste electrode modified with the ligand propyl gallate is introduced for preconcentration/voltammetric measurements of low levels of uranium. The resulting preconcentrating electrode offers many attractive properties for on-site sensing of uranium, including high sensitivity and selectivity, self-cleaning capability, and use of nondeaerated quiescent solutions. The response is characterized with respect to the paste composition, preconcentration period, solution and differential pulse conditions, and other variables. The sensor displays high stability, and can be used repeatedly without regeneration. When coupled to a 100-ft (30.5-m) long shielded cable, the electrode offers a remote sensing capability, as illustrated in the determination of uranium in groundwater.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070308
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of glucose at a rotating gold composite electrode by pulsed amperometric detection (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 443-446 
    Details
    ISSN: 1040-0397
    Keywords: Glucose ; Composite electrodes ; Pulsed amperometry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Segregated composite electrodes mimic microelectrode ensembles. In this preliminary report, the use of a rotating gold-polychlorotri- fluoroethylene (or Kel-F, a 3M Company polymer) composite electrode in combination with pulsed amperometric detection (PAD) is described for the detection of glucose. Comparisons are made with results obtained at a solid gold disk electrode. The composite electrode exhibits a higher signal and a lower background than does the solid gold electrode. In terms of current density, the enhancement of the signal above the background is over 3-fold, similar to that observed with segregated graphite composite electrodes used in a constant potential mode. Little or no glucose signal is observed at either the solid gold or the gold composite electrode when employed in the constant potential mode. In the PAD mode, the signal is stable for periods in excess of an hour.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080508
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  • 6
    Electronic Resource
    Electronic Resource
    Sulfur modification of polyethylene surfaces. II. Modification of polyethylene surfaces with fuming sulfuric acid (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1921-1926 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Previous work has shown that atomic sulfur irreversibility modifies polyethylene, presumably through an insertion reaction into carbon - hydrogen bonds with formation of surface thiol groups. The thiol groups were then oxidized to sulfonic acid surface groups, which were further reacted chemically as shown by wettability measurements. In this work the thiol group was bypassed and the surface sulfonic acid groups were obtained by exposing the polyethylene surface directly to fuming sulfuric acid. The sulfonic acid groups were reacted further. Critical surface tension values identical with those in the previous work with atomic sulfur were obtained, thus substantiating the previous work.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070730
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  • 7
    Electronic Resource
    Electronic Resource
    Sulfur modification of polyethylene surfaces. I. Insertion of sulfur into polyethylene surfaces (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1913-1920 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Atomic sulfur generated respectively by the pyrolysis of carbonyl sulfide and by the photolysis of carbonyl sulfide, carbon disulfide, and sulfur vapors has been shown to modify irreversibly the surface of polyethylene as shown by wettability measurements. The nature of the modification is not completely apparent from this portion of the study, however, insertion of the atomic sulfur into a carbon - hydrogen bond to form a surface thiol group appears likely. The modified surfaces thus formed are shown to undergo several classical organic reactions, as determined by wettability measurements.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070729
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  • 8
    Electronic Resource
    Electronic Resource
    Sulfur modification of polyethylene surfaces. III. Frustrated multiple internal reflection spectroscopy of sulfonated polyethylene surfaces (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 7 (1969), S. 1927-1932 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The previous publications of this series show by indirect means that atomic sulfur inserts into the carbon - hydrogen bonds of polyethylene surfaces. In this study, frustrated multiple internal reflection (FMIR) spectroscopy was used to obtain direct evidence of the nature of the surface groups of the modified polyethylene. The FMIR spectra of surfaces consisting of the products of sulfonic acid groups were virtually identical, regardless of whether the original sulfonic acid surface had been prepared by direct sulfonation or by oxidation of surface thiol groups. The latter groups resulted from the insertion of atomic sulfur into the carbon - hydrogen bonds of the surface. These results establish that sulfur is indeed inserted into polyethylene surfaces.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.150070731
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