| 摘要 |
Polymers are obtained by the reaction of tetrahydrofuran with a cyclic dicarboxylic acid anhydride. Suitable anhydrides are those of maleic, succinic, phthalic, dihydrophthalic, tetrahydrophthalic, hexahydrophthalic and endomethylenetetrahydrophthalic acids, which may be substituted by halogen or hydrocarbon groups. The polymers may be prepared in the presence of an organometallic compound RnM, where M is a metal of Groups I, II or III of the Periodic Table, R is hydrogen, halogen, hydroxy, alkoxy, alkyl, cycloalkyl, aryl, aralkyl or alkaryl, at least one R being a hydrocarbon group, and n is 1, 2 or 3, the valency of the metal, preferably also in the presence of 0.1 to 5 mols. per mol. of organometallic compound of an active hydrogen compound, e.g. water, an alcohol, an amine, or a thiol, and/or a compound capable of forming an oxonium or carbonium ion, e.g. propylene oxide, epichlorhydrin, acetyl chloride, acetic anhydride or benzyl chloride. Suitable organometallic compounds are n-butyl-lithium, dimethylzinc, diethylzinc, trimethylaluminium, triethylaluminium and tri-isobutylaluminium. About 0.1-10 mol. per cent of organometallic catalyst may be used based on the total monomer. An inert solvent, e.g. dioxane, toluene, or benzene, may be used. In examples, tetrahydrofuran is polymerized with phthalic anhydride or endomethylenetetrahydrophthalic anhydride in the presence of triethylaluminium, water and propylene oxide, epichlorhydrin or acetyl chloride. (Assuming all the anhydride to be consumed the yields suggest ratios of tetrahydrofuran to anhydride residues in the products of 1-4: 1). The products are insoluble in methanol, acetone and hexane. |
