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  • 1
    Electronic Resource
    Electronic Resource
    Syntheses and cis-trans isomerization of light-sensitive benzenediazo sulfides (1971)
    s.l. : American Chemical Society
    The @journal of organic chemistry 36 (1971), S. 2194-2196 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00814a039
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  • 2
    Electronic Resource
    Electronic Resource
    A polyvinyl chloride electret (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. S61 
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1962.070062429
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  • 3
    Electronic Resource
    Electronic Resource
    Internal field emission in carbon black-loaded natural rubber vulcanizates (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. 651-655 
    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: The nonohmic behavior of carbon black-loaded natural rubber viilcanizates was studied. Three samples contained high-abrasion furnace black (HAF) in good, moderate, and poor dispersion. Another sample contained a good dispersion of medium thermal black (MT). The nonohmic behavior of the poor HAF dispersion and that of the MT dispersion could be interpreted as due to internal field emission acroM insulating gap widths of 2 and 2.5 μ. The existence of such gaps waa confirmed by electron micrographs. No clear evidence of internal field emission could be obtained for the good and moderate HAP dispersions where, according to electron micrographs, the gaps are much narrower. There is some indication that the degree of diapersion can be correlated with field emission characteristics.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1962.070062408
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  • 4
    Electronic Resource
    Electronic Resource
    Dielectric behavior and resistivities of polyacrylonitrile and some pyrolyzates (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 553-559 
    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: Dielectric losses in polyacrylonitrile (PAN) and three pyrolyzates were studied between 1 Hz. and 300 kHz. Pure PAN has at 20°C. a very broad loss region with a maximum at 70 Hz. which is ascribed to CN groups. Powdered PAN was pyrolyzed in a nitrogen atmosphere at 170, 220, and 300°C. PAN-170 has the same loss maximum as the unpyrolyzed polymer, but the maximum had disappeared in PAN-220. This is attributed to formation of conjugated chains by linking of CN groups above 200°C. However, this does not enhance the conductivity until hydrogen is eliminated above 350°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090217
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  • 5
    Electronic Resource
    Electronic Resource
    Dielectric behavior of curing phenolic-formal resins (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 2843-2851 
    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: Dielectric properties of phenolic-formal resins are studied between 0.06 and 300 kHz. The resins are prepared from novolac and 1,3-dioxalane with a strong acid as catalyst. The high dielectric losses are attributed to proton jumps felicitated by water molecules which are produced in the curing reaction. The activation energy of the dielectric relaxation is 0.77 e.v. Curing often continues for weeks after preparation, which is reflected by a gradual increase of the frequency of maximum loss. Drying the samples causes the loss maximum to return to lower frequencies.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080629
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  • 6
    Electronic Resource
    Electronic Resource
    Le comportement diélectrique des polymères en solutions diluées (1957)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 233-240 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Dielectric properties and loss factors have been measured for dilute solutions of polyvinyl chloride in tetrahydrofuran and mixtures of this solvent with heptane, for solutions of polymethyl methacrylate in benzene and toluene, and for solutions of polyvinyl acetate in toluene. Concentrations varied from 0.5 to 8 g./100 ml. Frequencies ranged from 0.01 to 35 megacycles/sec., and temperatures from -35° to +25°C.Only one sample of polyvinyl chloride was used (DP = 1,750), but six fractions of methyl polymethacrylate (DP = 240 - 12,500) and four of polyvinyl acetate (DP = 2,550-23,250). Numerical values for the three polymers were rather similar. The root mean square dipole moments were proportional to the square root of DP. Relaxation times were practically independent of DP.
    Notes: Les propriétés diélectriques et les facteurs de perte ont été mesurés pour des solutions diluées de chlorure de polyvinyle dans le tétrahydrofurane et des mélanges de ce solvant avec l'heptane, pour des solutions de polyméthacrylate de méthyle dans le benzène et le toluène, et pour des solutions d'acétate de polyvinyle dans le toluène. Les concentrations variaient de 0.5 à 8 g./100 ml. Les fréquences allaient de 0.01 à 35 mégacycles/sec. et les température de -35° à +25°C. Un seul échantillon de chlorure de polyvinyle a été utilisé (DP = 1750); par contre quatre fractions de polyméthacrylate de méthyle (DP = 240-12.500) et quatre d'acétate de polyvinyle (DP = 2.550-23.250) ont été utilisées. Les valeurs numériques des trois polymères étaient plutǒt similaires. Les moments dipolaires moyens étaient proportionnels à la carrée du DP. Les temps de rélaxation étaient pratiquement indépendants du DP.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1957.1202310322
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  • 7
    Electronic Resource
    Electronic Resource
    Dielectric relaxation in dilute solutions of polar chain molecules (1957)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 211-221 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dielectric properties of polymer solutions are calculated on the assumption that each polymer molecule may be divided in N submolecules whose end-to-end distance shows Gaussian distribution. Electrical charges of alternating sign are attributed to the ends of these submolecules. The equations of motion are given for free-drained structures. From these equations of motion the diffusion equation in configuration space is constructed. The average dipole moment can be calculated by a simple integration procedure. It is found that there should be two dispersion regions, one at low frequencies proportional to 1/N2 and one at high frequencies independent of N. The high frequency maximum in the loss curve has a shape which is very nearly that for a process with a single relaxation time.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1957.1202310320
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  • 8
    Electronic Resource
    Electronic Resource
    Purification and viscosity experiments on gum arabic (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 33 (1958), S. 463-469 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A purification procedure for gum arabic is reported. The impurities can be entirely removed by treating the aqueous solutions with cation exchange resin. The samples are precipitated by acetone. The ionic impurities are found to consist of Mg, and traces of Fe have been confirmed. The effect of these ions on the viscosity contribution is investigated. The presence of these impurities causes a decrease in the limiting viscosity number which can be explained by electrovalent crosslinking. A similar effect is ob served for a sample that has been dried over concentrated sulfuric acid and can in this case be explained by covalent crosslinking.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1203312643
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  • 9
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    Unknown
    Effect of Adsorbed Water on the Optical Transmission Properties of Isotropic Powders (1959)
    American Institute of Physics
    Details
    Publication Date: 1959-12-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 10
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    Syntheses and cis-trans isomerization of light-sensitive benzenediazo sulfides (1971)
    American Chemical Society
    Details
    Publication Date: 1971-07-01
    Print ISSN: 0022-3263
    Electronic ISSN: 1520-6904
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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