Introduction of Living Polymerization. Living and/or Controlled Polymerization
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY
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The effect of various imperfections such as slow initiation, termination, transfer and slow exchange on kinetics, molecular weights and polydispersities in chain growth polymerizations are simulated. The simulations demonstrate that well defined polymers can be prepared in systems with chain breaking reactions. Thus, under carefully selected conditions nonliving polymerization may provide controlled polymers. On the other hand, polymers with unpredicted molecular weights, broad and even polymodal molecular weight distributions can be formed in living systems without irreversible transfer and termination. In some living systems molecular weights may stay constant or even decrease with conversion. Thus, living and controlled polymerizations should be differentiated.
- Physical Chemistry
- Polymer Chemistry