Cationic polymerizations of trioxane in 1,2-ethylene dichloride and benzene were heterogeneous and reversible. Phase separation accompanying with crystallization occurred during the polymerization. Three morphological changes were found in the course of the polymerization as were investigated by dil
Termination processes in the cationic polymerization of trioxane
β Scribed by F. Morelli; R. Tartarelli; G. Masetti
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 151 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0014-3057
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β¦ Synopsis
In the cationic polymerization of trioxane initiated by BF, etheratc in cyclohexane solution, the rate of polymerization may be practically zero after a long period at 56 Β°. If the reaction mixture is then cooled at a controlled rate, it is possible to obtain further increments both in yield and in molecular weight.
π SIMILAR VOLUMES
The polymerization of trioxan, initiated by boron trifluoride n-butyl etherate, has been studied in cyclohexane solution at 50 Β°, 65 Β° and 70 Β°. Correlations have been obtained between the yields and inherent viscosities of the polymer and the main reaction variables. Increasing the concentration of
The occurrence of hydride-transfer reactions during the cationic polymerization of trioxane was demonstrated, and rate constants were obtained. The donor of hydride ions in the transfer reactions was the monomer. The hydride-transfer reaction was a first-order reaction with respect to the concentrat
A~traet A numeric solution is developed for a kinetic scheme involving chain length dependent termination (by disproportionation) and chain transfer on the basis of the harmonic and the geometric mean approximation for the two radicals involved in the termination process. In addition, solutions in t