The ionic crosslinked acrylic elastomers were synthesized by radical copolymerization of monomer mixtures composed of soft-type monomers (n-butyl, or 2-ethylhexyl acrylate), hard-type monomers (methyl methacrylate, styrene or t-butylstyrene) and crosslinkable monomers introducing covalent and ionic bondings. As the composition parameter for copolymer, “Averaged Rotation Energy Barrier Value”(Eb(d)) was introduced. The values of Eb (d)were calculated from the each diad's Eb (d) obtained by molecular mechanics (“Dreiding II”) and averaged diad concentrations obtained by copolymerization theory. The linear (negative) relationship between Eb (d) and the products of tensile strength and elongation, T
B×E
B, was observed, and the linear (positive) relationship between Eb (d) and the areas under tan δ-temperature curves in glass transition regions observed by dynamic mechanical analysis, LA, was observed. These results suggest that Eb (d) is available for the estimation of toughness (T
B×E
B) and dynamic loss (LA, for damping behavior etc.) of acrylic elastomer.
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