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
URL:
http://dx.doi.org/10.1002/apmc.1988.051610118
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