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  • 1
    Electronic Resource
    Electronic Resource
    Modification of the brice light-scattering photometer for photoelectric polarimetry by the rouy method (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 439-445 
    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: Construction details for modifying the Brice light-scattering photometer for use in photoelectric polarimetry have been given. The measuring technique is based on the Rouy method, which is perhaps the most sensitive of all photoelectric methods of measuring the optical rotation of liquids, especially at small angles. A standard deviation of 0.01° has been observed with the use of an instrument modified in this way.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080127
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the terpolymer composition equation (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 54 (1961), S. 363-374 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The equations describing the relationships between polymer composition and feed composition in a three-monomer polymerization have been experimentally verified at high monomer conversions for the first time. In this paper, a three-component system involving vinyl acetate-octyl fumarate-N-vinyl pyrrolidone was analyzed. The six reactivity ratios, or relative reaction rate constants, were either taken from previous literature or determined from two-component systems. The differential terpolymerization equations could be integrated analytically in special cases, owing to the negligibility of some of the terms, but a more precise technique was to integrate numerically with a digital computer. Two feed compositions were polymerized to various levels of fumarate conversion covering the entire range. The extent of conversion was determined polarographically. Average terpolymer compositions, determined by elemental analysis, checked with values predicted by the mathematical model well within experimental error. The calculations also showed that the instantaneous terpolymer composition can vary considerably during a batch polymerization and give rise to a spectrum of polymer properties.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205416008
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