Abstract
Copolymers with uniform grafts were prepared by copolymerization of polystyrene macromer with butyl acrylate and acrylic acid. They were neutralized with alkali or metallic salts to form ionomers. The tensile strength of the ionomers can reach almost twice those of copolymers of butyl acrylate and acrylic acid without uniform polystyrene grafts or those of copolymers without neutralization. The tensile strength of ionomers neutralized with different metallic ions decreases in the following order: Pb 2+ > Zn 2+ > Na + > Ca 2+ > Mg 2+ > K +. The water absorbency of the ionomers decreases with increasing amount or increasing molecular weight of the polystyrene grafts, but increases with metallic ions used in neutralization in the order: Pb 2+ < Zn 2+ < Mg 2+ < Ca 2+ < K + < Na +.
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