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The influence of γ‐butyrolactone (γ‐BL), used as solvent of BF3‐amine complexes, on the polymerization of monoepoxides was studied. Different intermediate reaction products of PGE initiated by BF3‐4‐methoxyaniline (BF3‐4MA) previously solubilized in γ‐BL (55% by weight), were separated and analyzed by 1H‐NMR. It is shown that there is the opening of both epoxy and γ‐BL. The latter does not homopolymerize, but copolymerizes well with epoxy groups. The use of a large quantity of γ‐BL leads to a decreasing molar mass of the formed polymer. The kinetic study allowed to propose the mechanism of the cationic polymerization of epoxy initiated by BF3‐amine complex in the presence of γ‐BL.
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Chabanne et al. (1994) studied this question.
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