PREPARATION AND STRUCTURE OF POLYETHER-BLOCK CONTAINING POLYMERS

Block-copolymers were prepared by direct polycondensation of functiona l oligomers or by polycondensation of a functional oligomer with the p recursors of another block. Three series of copolymers were prepared a nd characterized: poly(polyamide 12-block-copolyether)s, tylene-block- polyoxyethylene-graft-polyoxyethylene and poly(semi-aromatic polyester -block-polyoxytetra methylene)s. The functional oligomers and the corr esponding copoly-condensates were characterized by SEC, infra-red spec troscopy, mass spectrometry, H-1 and C-13 NMR (solution and solid stat e). Their thermal properties were analyzed and the extent of the segre gation in poly(polyester semi-aromatic-block-polyoxytetramethylene) s was studied through visco-elastic properties.