| 摘要 |
1302714 Electrolytically preparing a dicarboxy-terminated polymer UNIROYAL Inc 4 May 1970 [9 May 1969] 21251/70 Heading C7B [Also in Division C3] High molecular weight dicarboxy terminated polymers are prepared by subjecting a dicarboxylic acid to electrolysis in an organic solvent having a dielectric constant not lower than 20 at 20‹C. and continuing the electrolysis in an ionizable environment. The solvent may be methanol, ethanol, dimethyl formamide, dimethyl acetamide or N-methyl pyrrolidone. Ionization may be promoted by the addition of a small amount of a base, e.g. triethylamine, sodium methoxide, benzyl trimethyl, ammonium hydroxide or choline. The anode may be of platinum and the cathode of platinum or mercury. The dicarboxylic acid may be of formula (R)(COOH) 2 where R is an alkylene, alkenylene, alkadienylene, alkylidene, alkynylene, alkadiynylene, arylene, aralkylene or alkarylene radical containing 1 to 18 carbon atoms and optionally substituted with hydroxy, ester, ether, nitrile or sulphide groups or halogen atoms. Many suitable radicals are specified and examples describe the preparation of carboxy-terminated polyethylene from (1) azelaic acid and (2) sebacic acid; carboxy-terminated isobutylene/methylene alternating copolymer from (3) dimethyl glutaric acid; and carboxy-terminated trans-polybutadiene from (4) trans-#-hydromuconic acid. |
