Effect of ring‐size in cationic polymerization of cyclosiloxanes. D 6 ‐polymerization initiated by trifluoromethanesulfonic acid | Zendy

Gobin C. | Zendy; Masure M. | Zendy; Sauvet G. | Zendy; Sigwalt P. | Zendy

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Effect of ring‐size in cationic polymerization of cyclosiloxanes. D 6 ‐polymerization initiated by trifluoromethanesulfonic acid

Author(s) -

Gobin C.,

Masure M.,

Sauvet G.,

Sigwalt P.

Publication year - 1986

Publication title -

makromolekulare chemie. macromolecular symposia

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.257

H-Index - 76

eISSN - 1521-3900

pISSN - 0258-0322

DOI - 10.1002/masy.19860060122

Subject(s) - cationic polymerization , polymerization , ring opening polymerization , chemistry , polymer chemistry , reaction rate constant , ring (chemistry) , triflic acid , catalysis , kinetics , organic chemistry , polymer , physics , quantum mechanics

Cationic polymerization of dodecamethylcyclohexasiloxane (D 6 ) initiated with triflic acid at 20°C in CH 2 Cl 2 shows a stationary concentration of active centres. This has permitted the measurement of k px [P n * ] for the various D x cyclics, and of the ratios of propagation rate constants k p5 /k p4 ∼ 2,2 ± 0,4 and k p6 /k p4 ∼ 5,8 ± 1,2. On the other hand, the back‐biting rate constants were not significantly different for various cyclics formation (k 4 ∼ k 5 ∼ k 6 ). These values have been compared with those obtained from D 4 and D 5 polymerizations.

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