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Cationic ring‐opening oligomerization of hexamethylcyclotrisilazane and octamethylcyclotetrasilazane
Author(s) -
Duguet Etienne,
Soum Alain
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960219
Subject(s) - cationic polymerization , polymer chemistry , ring (chemistry) , chemistry , ring opening polymerization , polymer science , materials science , polymer , organic chemistry , polymerization
The study of the ring‐opening oligomerization of hexamethylcyclotrisilazane (D 3NH ) and octamethylcyclotetrasilazane (D 4NH ), initiated by methyl triflate in 1,2‐dichloroethane, was carried out. Size‐exclusion chromatography (SEC) analysis indicated the occurrence of an equilibrated reaction between macrocycles such as (SiMe 2 NH) n (with 3 ≤ n ≤ 13) (Me:CH 3 ). Kinetic measurements showed that these oligomerizations are first order relative to both monomer and active center concentrations at the beginning of the reaction. The initial rate constants of propagation ( k p x ) 0 and the ratios of propagation and back‐biting ones ( k p x / k x ) were estimated. Complementary experiments allowed us to propose a mechanism of the oligomerization.