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  • 1
    Electronic Resource
    Electronic Resource
    Modality of molecular weight distributions (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 569-570 
    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: Even restricting attention to weight distributions, it is ambiguous to merely say that a polymer is “not bimodal.” A simple example is shown wherein the weight distribution of log (molecular weight) is bimodal, but the weight distribution of molecular weight is not bimodal.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-conversion emulsion polymerization in a continuous reactor: Predictions using smith-ewart kinetics (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1771-1780 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Smith-Ewart Case-2 kinetics are applied to a continuous stirred tank reactor operating at steady state in the high and middle range of conversion. Above the conversion CD at which the monomer droplets disappear in a batch reaction, the predictions are surprising. The particle size is predicted to be inversely proportional to the effective soap concentration S and independent of mean residence time θ below CD it is predicted to be proportional to the one-third power of θ and independent of S. Above CD the particle concentration should be proportional to the cube of S and independent of θ; below this it should be as predicted by previous workers. The expressions for conversion are also different above CD. A new, more instructive, derivation is used. Simple analytic expressions are given for commonly used breadth parameters of the particle size distribution. It is shown that when conversion is low, an approximation made by previous workers is invalid, in that the growth rate can no longer be considered continuous.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180809
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    Paper (German National Licenses)
    Fulltext
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