ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A comprehensive study of the 1-heptyne polymerization initiated by a carbene complex of tungsten was carried out. Kinetic orders, apparent rate constants and thermodynamic parameters of the propagation step were determined. The structure of the organic products appearing simultaneously with the polymer during the reaction was identified by NMR and mass spectrometry. According to the experimental data, a mechanism of the propagation reaction is proposed: the propagating species derive from an initial active carbenic complex formed consequently by the insertion of the first monomer molecule into the [C—W] bond of the initiator. Then, these active centres give, through a steady-state process, active high-polymeric chains. In competition with the normal insertion of the monomer molecules, termination and transfer reactions occur, including or not the monomer and/or the polymeric chain.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1992.021930213
