Abstract
(n-Butyl acrylate-acrylic acid) copolymers with uniform polyoxyethylene (PEO) side chains [corresponding to units of a (BA-AA) PEO macromer] and ionomers from them were synthesized and characterized, and their properties were studied. The results showed that the methacrylate terminated PEO macromers copolymerized more quickly than BA or AA at the beginning of terpolymerization. Conversion of the macromer increases with increase of initiator and with decrease of molecular weight of the macromer or ratio of macromer to monomers in the feed. The i.r. spectrum of the purified terpolymer shows the presence of hydrogen bonds between PEO chains and poly(AA) units, while that of the ionomer made from it indicated the disappearance of hydrogen bonds and the appearance of carboxylate groups. The average number of PEO chains per molecule ranged from 6 to 16. The terpolymers can emulsify the benzene/water system and they show high water absorbency. The terpolymers exhibit crystallinity which diminishes with increase of AA content. Tensile strength of the terpolymers increases more noticeably with AA content than with PEO content. The strength of a terpolymer is raised markedly when it is converted to a metallic salt. The tensile strength of an ionomer containing Na + or K + is much lower than that for an ionomer containing divalent cations, because of the stronger complex formation between PEO and univalent cations.
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