Synthesis and characterization of poly(butadiene- b-sulphone) by block-copolycondensation—I. Synthesis from α,ω-dichlorocarbonyl oligobutadienes and α,ω-diphenol oligoarylethersulphones

Abstract

Synthesis of poly(butadiene- b-sulphone) has been carried out by two methods. Reaction of α,ω-di(sodium phenolate) oligosulphone with α,ω-di(chlorocarbonyl)oligobutadiene or reaction of α,ω-diphenol oligosulphone with α,ω-di(chlorocarbonyl)oligobutadiene in the presence of magnesium. For both methods, the reaction was carried out between two models (bisphenol A and adipoyl chloride) or between a model and an oligomer or between two oligomers. For the first reaction a two-step process, involving the separation and the purification of the phenolate, is described: it is more efficient than the classical one-step process, where acid chloride is added in an alkaline solution of phenol. The second method, which seems never to have been used in polymer synthesis, gives better results than the first, with higher DP n and less interference from side-reactions.