Cyclization in reversible and irreversible step-growth polymerizations |
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| Institution: | 1. Dipartimento di Farmacia, Università ‘G. D’Annunzio’ Chieti-Pescara, Via dei Vestini 31, 66100 Chieti Scalo (CH), Italy;2. Laboratoire de Cancérologie et de Toxicologie Expérimentale, Faculté de Pharmacie, Université Libre de Bruxelles, 1050 Brussels, Belgium;1. Department of Chemistry, The University of Texas at Dallas, Richardson, TX 75080, United States;2. Korea Institute of Carbon Convergence Technology, Jeonju City, South Korea;3. Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX 75080, United States |
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| Abstract: | Several aspects of cyclization reactions in step-growth polymerizations are considered. The Jacobson–Stockmayer ring-chain equilibrium theory provides the basis for understanding these systems, but there are circumstances where some modifications to the theory are needed. In particular, for ring expansion polymerizations, i.e. those for which there is never a significant fraction of open chains, the statistics are a bit different from those appropriate for ring-chain equilibrium. Also, if the reactions are irreversible the occurrence of rings is significantly different from the reversible case. Rings are more prevalent in irreversible reactions. The implications of these observations for the processing of polymers are briefly considered. |
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