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  • Polymer and Materials Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 161 (1988), S. 195-204 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An automatic polymerization reactor has been developed for on-line measurement of conversion, viscosity, and molecular weight distribution of homogeneous free radical polymerization.For on-line measurements during polymerization a fraction of the reaction mixture is pumped as bypass through a densimeter and a viscometer. In time intervals of 15 min samples are taken, diluted semi-automatically, and then injected into a high performance gel permeation chromatography for determination of the molecular weight distribution of the polymers. A microcomputer collects these data, calculates the conversion of reaction and the output data for different control units.Methyl methacrylate is polymerized batch-wise in solution with ethyl acetate as solvent and dicyclohexyl peroxydicarbonate as initiator. Semi-batch polymerizations with constant reaction rate are performed by feeding initiator which is controlled by open-loop and closed-loop control.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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