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

Listen

Translate article

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.