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Changes in concentration of tetraoxane produced during the solution polymerization of trioxane catalyzed by BF 3 ·O(C 2 H 5 ) 2

1967; Inderscience Publishers; Volume: 5; Issue: 12 Linguagem: Inglês

10.1002/pol.1967.150051201

1542-9350

T. Miki, Toshinobu Higashimura, Seizô Okamura,

Photopolymerization techniques and applications

Abstract The behavior of tetraoxane produced during the polymerization of trioxane was investigated kinetically. In the polymerization of trioxane, a short induction period for the formation of methanol‐insoluble polymer was observed and during the induction period a certain amount of tetraoxane, depending on the polymerization conditions, was produced. This amount was independent of the initial concentration of catalyst but increased with an increase in the polymerization temperature and in the initial concentration of trioxane. So this amount was found to be determined by the equilibrium between the formation and consumption of tetraoxane. On the other hand, in the early stage of polymerization of trioxane, the formation of an appreciable amount of soluble polymer was estimated. Consequently the formation of tetraoxane was explained in terms of the “back‐biting” reaction of the soluble growing chain with depolymerization.