Functional Polymers and Sequential Copolymers by Phase Transfer Catalysis VII. Synthesis and Characterization of Alternating Block Copolymers of Aromatic Poly(ether sulfone)s with Aliphatic Polysulfldes and Aliphatic Polysulfones

Abstract

α,ω-Di(bromo)polyhexamethylenesulfides were polyetherified with α,ω-di(phenol)aromatic poly(ether sulfone)s in the presence of tetrabutylammonium hydrogen sulfate (stoichiometric amounts versus phenolic end groups) as phase transfer catalyst, in a two phase system of 50 wt% aqueous NaOH solution and monochlorobenzene. The alternating block copolymers obtained, were transformed into polyhexamethylenesulfone–aromatic poly(ether sul-fone) alternating block copolymers by oxidation with m-chloroperbenzoic acid in chloroform solution. DSC analysis of both types of alternating block copolymers show phase separation, due to the crystallization of the polyhexamethylenesulfide or polyhexamethylenesulfone blocks.