Anionic polymerization of dodecamethyl‐cyclohexasiloxane (D6) with lithium cryptate as a counterion

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Abstract
A kinetic study of the anionic polymerization of dodecamethylcyclohexasiloxane (D6) has been carried out in toluene at 25°C with the cryptate Li+ + [211] as the counterion. The rate constants of propagation of D6 and of the formation of cyclic oligomers have been determined. The results are in good agreement with those reported previously for the anionic polymerization of D3 and D4 under the same conditions. The rate constants of propagation and of formation of D6 have been found to be equal to 1.1 l‐mol−1.h−1 and 0.05 h−1, respectively. In the case of the anionic polymerization of cyclosiloxanes with Li+ + [211] as the counterion, the order of reactivities of Dx as a function of × is as follows: