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  • Chemistry  (4)
  • General Chemistry
  • LUNAR AND PLANETARY EXPLORATION
  • 1990-1994
  • 1970-1974  (4)
  • 1970  (4)
Collection
Publisher
Years
  • 1990-1994
  • 1970-1974  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 10 (1970), S. 24-31 
    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: Flow at the entrance of a tube or channel is of interest in many polymer processes. Except for mathematical treatments at high Reynolds numbers and in creeping Newtonian flow, one must turn to empirical correlating equations and qualitative observations. These are discussed in two parts, one on pressure drop and the other on flow patterns. The discussion of pressure drop is largely a review, dealing with inertial, viscous, and elastic contributions to the pressure drop in tapered and sharp-edged entrances; also presented are new data for a viscoelastic polymer solution in tapered cone entrances. In the section on flow patterns, stress birefringent data for a very elastic solution flowing into a channel entrance show an unusual effect: stress discontinuities, not unlike “shock waves,” upstream and downstream of the entrances. This is in contrast to Newtonian and less elastic materials in which the stress patterns change gradually between the developed flow region and the entrance region.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 4 (1970), S. 121-138 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The nonthrombogenic property of the graphite-Benzalkonium-heparin surface has not been consistently attained by those using this coating. In addition, there is mounting evidence that this property is not dependent entirely on the presence of heparin. A series of tests were conducted to further define the properties of colloidal graphite materials, methods of control and possible relationships to thrombus formation. These tests included electrokinetic investigations, dielectric measurements and other physical/chemical property evaluations. It was found that the colloidal graphite coating approximates many properties which are characteristic of animal tissue. However, considerable scatter in the duplication of these properties was encountered. The properties which seemed to separate the Acheson Colloids Company DAG-35 coating from other graphite products were those of porosity and permeability. Control of these parameters may be critical to achieving consistent uniform success.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 132 (1970), S. 23-33 
    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: Es wurde gezeigt, daß Polysulfon eine wesentlich höhere thermische und thermooxydative Beständigkeit aufweist als Polycarbonat, Polyarylate (hergestellt durch Kondensation von Terephthaloylchlorid und Bisphenol A bzw. Terephthaloylchlorid und Phenolphthalein) und Polyphenylenoxid. Die vier zuletzt genannten Polymeren unterscheiden sich nur wenig in ihren thermischen Stabilitäten. Für den thermooxydativen Abbau ergibt sich. daß das Polysulfon am stabilsten ist, während das Polyphenylenoxid die geringste Beständigkeit aufweist. Die Stabilität der drei Polyester ist vergleichbar und liegt zwischen diesen beiden genannten Polymeren. Hier werden die Unterschiede auf die relative Stabilität der Nachbargruppen der Phenyleneinheiten zurückgeführt. Die geringe Stabilität des Polyphenylenoxids wird durch die leichte Oxydierbarkeit der Methylseitengruppen erklärt. Deshalb kann das Polyphenylenoxid als ein Polymeres angesehen werden, das aus potentiellen Antioxydantien-Einheiten aufgebaut ist, was auch den oxydativen Abbau erklären könnte.
    Notes: It has been shown that polysulphone is appreciably more stable to thermal and thermaloxidative breakdown than polycarbonate, the polyarylates, prepared from the condensation of terephthaloyl chloride/bisphenol A and terephthaloyl chloride/phenolphthalein, and polyphenylene oxide. The latter four polymers differ little in their thermal stabilities but regarding thermo-oxidation, while the three polyesters are comparable, minor differences being attributable to the relative stability of the phenylene linking groups, polyphenylene oxide is markedly less stable. This has been explained as being due to the oxidisability of the pendant methyl groups in polyphenylene oxide. Also, it is noted that this polymer may be considered as being composed of potential antioxidant units and accordingly is liable to oxidative breakdown.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 2 (1970), S. 101-114 
    ISSN: 0538-8068
    Keywords: Chemistry ; Physics Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The absolute rate constants have been measured for several gas-phase chlorine atom-molecule reactions at 25°C by resonance fluorescence. These reactions and their corresponding rate constants in units of cm3 mole-1 sec-1 are: The effects of varying the substrate pressure, total pressure, light intensity and chlorine-atom source on the value of the bimolecular rate constants have been investigated for all these reactions. Conditions under which no competing side reaction occurs were established and the reported rate constants were measured under these conditions. For reactions (2), (5), (6), (7), and 8, there is a discrepancy of a factor of two between the rate constants measured in this work and values in the literature; it is suggested that this is due to an error in the previously measured value of kCH4/kH2 upon which the relative measurements in the literature ultimately depend.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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