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Ionomers made from terpolymers with uniform poly(methyl methacrylate) grafts
Author(s) -
Xie HongQuan,
Zhou ShiBiao
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070420124
Subject(s) - ionomer , macromonomer , methyl methacrylate , materials science , polymer chemistry , methacrylate , copolymer , ultimate tensile strength , acrylate , butyl acrylate , monomer , grafting , composite material , polymer
Abstract Terpolymers with uniform poly(methyl methacrylate) (PMMA) grafts were prepared by terpolymerization of PMMA macromonomer, butyl acrylate, and acrylic acid in benzene using AIBN as initiator. During terpolymerization the macromonomer polymerizes faster than the monomers at the beginning but slower at the latter stage. The terpolymers were purified by solvent extraction and fractional precipitation. The average grafting number per chain of the terpolymers was determined to be 3–8. Ionomers were obtained by neutralization of the terpolymers with alkali hydroxide or metallic acetate. Dynamic mechanical spectrum of the ionomer shows the existence of two T g 's, which implies the occurence of microphase separation. The ionomer exhibits high damping over a temperature range from −25 to 100°C. Both PMMA grafts and metallic carboxylate content raise the tensile strength of the ionomer and lower the ultimate elongation. 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 ionomers with uniform PMMA grafts show much better mechanical properties than the terpolymer without neutralization or the ionomer without PMMA grafts.