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Kinetic model of Ziegler-Natta polymerizations

A model including all the presently known processes occurring in Ziegler— Natta coordination polymerizations has been published by Bohm [35], It is a special case of the Rideal mechanism [36], and it can be applied to both [Pg.515]

A mathematical description of several mutually connected chemical reactions usually requires some simplification. According to Bohm, all reactive intermediates are assumed to exist in a stationary state, and all rate constants are assumed to be independent of the length of the growing macromolecules. As the derived expressions should also describe heterogeneous polymerizations, the author used the numbers of particles in unit volume of reacting medium instead of concentrations. Some expressions can be simplified in this [Pg.516]

The symbols used in the equations, correspond to the following quantities  [Pg.517]

The generation and decay of a discrete type of centre is equally rapid, thus [Pg.517]

The amounts of various complexes are described by the following equations [Pg.518]

1-alkenes. It consists of two cycles. The first, composed of reactions (l)-(5), describes the insertion of ethylene into the metal-polymer bond. The remaining reactions, forming the second cycle, are transfer processes, proceeding spontaneously or with transfer agents (reactions with hydrogen are indicated by broken lines). The author provides the following explanation to the scheme  [Pg.516]


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