Preparation and structure of polyether-block containing polymers

Block-copolymers were prepared by direct polycondensation of functional oligomers or by polycondensation of a functional oligomer with the precursors of another block. Three series of copolymers were prepared and characterized: poly(polyamide 12-block-copolyether)s, Polyisobutylene-block-polyoxyethylene-graft-polyoxyethylene and poly(semi-aromatic polyester-block-polyoxytetra methylene)s. The functional oligomers and the corresponding copoly-condensates were characterized by SEC, infra-red spectroscopy, mass spectrometry, H-1 and C-13 NMR (solution and solid state). Their thermal properties were analyzed and the extent of the segregation in poly(polyester semi-aromatic-block-polyoxytetramethylene) s was studied through visco-elastic properties.