Ionomeric block copolymers — preparation, characteristics and application
Polimery 2003, No 10, 678
Block copolymers poly(ethylene oxide) — polyacrylonitrile (PEOX-b-PAN) and ionomeric block copolymers: poly(ethylene oxide) — copolymer of acrylonitrile/2-acrylamide-2-niethylopropane sulphonic acid [PEOX-b-(AN-co-AMPS)n+m] or poly(ethylene oxide) — copolymer of acrylonitrile/acrylic acid [PEOX-b-(AN-co-AA)n+m] were synthesized with the use of macro-azo-initiator (MAI) (Table 1) containing azo groups. MAI is a product of a reaction of poly(ethylene oxide) methyl ether and 2,2'-azobisisobutyronitrile [equation (1)]. The effects of molecular weight of initial PEOX used for MAI synthesis as well as the concentrations of MAI and AA or AMPS (Tables 2—4, respectively) on the conversion degree, composition and intrinsic viscosity of the product were investigated. The products obtained were characterized using FT-IR and 1H NMR methods as well as GPC curves (Figs. 1—4). The fibers showing strength properties, suitable for technical goods (Table 5), were obtained from the solutions of the block copolymer PEOX-b-PAN and ionomeric block copolymer PEOX-b-(AN-co-AMPS)n+m.
Keywords: ionomeric block copolymers, poly(ethylene oxide), acrylonitrile, 2-acrylamide-2-methylpropane sulphonic acid, acrylic acid, fibers, macro-azo-initiators