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  • Articles  (6)
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  • Wiley-Blackwell  (5)
  • American Institute of Physics  (1)
  • 1980-1984  (6)
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  • Articles  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Examples of triphase reactions involving a crosslinked polymer, a solid, and a liquid phase (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 489-497 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Several reactions involving crosslinked polymers, a solid, and a liquid phase were investigated. Witting reactions between crosslinked polymers (1 and 5) contaning phosphonium salt residues, solid potassium carbonate, and aldehydes in tetrahydrofuran were found to proceed satisfactorily, even in the absence of a phase transfer catalyst. The Oxidation of 2-phenyl-1,2-propanediol in methylene chloride by solid sodium periodate (but not postassium periodate) is catalysed by the periodate form (9a) of an anion exchange resin. The reaction of 1-bromooctane in benzene, tetrahydrofuran, or acetonitrile with potassium cyanide or sodium cyanide and of benzyl bromide in tetrahydrofuran or acetonitrile with potassium acetate or sodium acetate are catalysed only slightly, if at all, by the cyanide or acetate forms (9e and 9f) of an anion exchange resin. Crosslinked polymers containing crown ether residues catalyse the reaction of 1-bromooctane in toluene with sodium iodide. It is not clear how the crosslinked polymers and solid reagents manage to react with each other, but possible mechanisms are discussed. The importance of carrying out control reactions in such studies is stressed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850307
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Direct visualization of particle velocity distribution by pseudostereoscopic viewing of time-lapsed sequential images: Application to fast axonal transport (1984)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 4 (1984), S. 231-239 
    Details
    ISSN: 0886-1544
    Keywords: pseudostereoscopy ; particle speed distribution ; velocity distribution ; fast axonal transport ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We describe a simple method for direct visualization of the velocity distribution of particles moving against an immobile background. The technique involves pseudostereoscopic viewing of image pairs separated by an appropriate time interval in a sequential recording of the subject. Under these conditions, the positive or negative parallax arising from particle motion results in the binocular image of a particle being perceived as raised or lowered relative to an immobile background plane depending on its direction of movement, and with the degree of perceived elevation being proportional to its speed. In effect, the binocular optic axis becomes a velocity (speed) axis under these conditions. The technique is illustrated with examples of image pair sequences showing fast axonal transport in lobster and squid axons using video-enhanced differential interference contrast microscopy. However, the pseudostereoscopic method is quite generally applicable to both microscopic and macroscopic time-dependent phenomena. Particle speeds can be quantitated using standard procedures for measuring frame-to-frame particle displacements, or alternatively, by determination of parallax using stereogrammatic methods. It should be also readily adaptable for on-line monitoring of particle velocity distribution, particularly in video systems where frame buffers can be utilized to extract and present serial image pairs having any desired time separation from video-taped sequences.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970040402
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of stress and vapor exposure before and during aging on enthalpy relaxation of poly(vinyl chloride) (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 1123-1129 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Enthalpy relaxations in glassy poly(vinyl chloride) following varied pre-aging treatments and under varied aging conditions have been compared through observations of sub-Tg endothermal DSC (differential scanning calorimetry) aging peaks. The extent of enthalpy relaxation for a fixed time and temperature of aging is progressively enhanced by the imposition and release of increasing mechanical stress before aging. The same effect is produced by sorption and desorption of increasing amounts of CO2 or CH3Cl vapor before aging. In contrast, the continued application of mechanical stress, or the presence of vapor, during the aging period suppresses enthalpy relaxation. The extent of suppression increases with increasing vapor pressure and solubility or increasing stress. These effects are interpreted as consequences of an increase in the enthalpy of the polymer under mechanical or sorptive stress and an enthalpy relaxation following the release of this stress. In addition to these effects on the DSC endotherm, a pronounced exotherm between the aging peak and Tg is observed for samples which have undergone shear yielding or orientation either before or during aging. This exotherm may be the result of release of stored strain energy during the DSC scan.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760241408
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  • 4
    Electronic Resource
    Electronic Resource
    The synthesis of a macromolecular ligand by the modification of polystyrene (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 175-194 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Uncrosslinked atactic polystyrene was chemically modified first by acetylation then by a Claisen condensation with ethyl perfluoropropanoate to produce three crosslinked chelating polymers that contained a phenyl, perfluoroethyl, beta-diketone chelating group in 10, 20, and 63 mole % compositions. Cu(II), Ni(II), and uranyl chelates of the macromolecular ligands were prepared and analyzed. The macromolecular ligands and their chelates were compared with the model ligating species 4,4,5,5,5-pentafluoro-1-phenyl-1,3-pentanedione with infrared and mass spectroscopy and proton nuclear magnetic resonance.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170190117
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  • 5
    Electronic Resource
    Electronic Resource
    Epitaxial crystallization of polymers onto benzoic acid: Polyethylene and paraffins, aliphatic polyesters, and polyamides (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 21 (1983), S. 2495-2509 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Epitaxial crystallization of polyethylene, n-paraffins, aliphatic polyesters, and various polyamides has been achieved on benzoic acid crystal substrates, specifically on their (001) crystals faces, which are made up of the aromatic rings. The epitaxial relationship is very similar for all polymers investigated: it is characterized by a unique chain orientation (parallel to the b axis of the substrate) and a plane of contact which is either the b-c, plane of polyethylene, or crystallographically similar ones for polyesters, or the plane of the hydrogen-bonded sheet for polyamides. Since benzoic acid is structurally similar to its alkali-metal salts, it is inferred that the nucleating efficiency of the latter toward chemically different but structurally similar polymers may well rest on an epitaxial relationship. Finally, the highly oriented morphology made it possible, for some polyesters with a monoclinic cell, to determine the angle between the chain axis and the Z axis of the optical indicatrix, a quantity not measured so far in polymers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.180211207
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  • 6
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    Grazing incidence time‐resolving spectrograph for magnetic fusion plasma diagnostics (1984)
    American Institute of Physics
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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