alexa Auto-Acceleration in Free-Radical Polymerizations Under Precipitating Conditions


Journal of Membrane Science & Technology


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When a monomer polymerizes under "normal" conditions the reaction follows the rules of stationary state and the rate remains constant over a fairly broad range of conversions. It is well known, however, from the study of numerous systems, that after a certain conversion is reached the reaction medium turns highly viscous and the rate then gradually increases leading to kinetic anomalies generally referred to as the "gel effect". This effect which was reported for the first time in 1939 by NORRISH and BROOKMAN (1) to occur in the bulk polymerization of methyl methacrylate is sometimes erroneously called "Trommsdorff effect" based on a report on German Science during world war II published by the allied forces in 1945. The "gel-effect" is caracterized by auto-accelerated conversion curves and, under extreme conditions, the heat of the reaction can no longer be dissipated which may result in thermal explosions.

This article was published in Polymer Science Overview and referenced in Journal of Membrane Science & Technology

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