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Cooperative Interaction on Side-Chain Motion of Poly(α-amino acid)

Models of interacting side chains were proposed to explain the dielectric properties of poly(α-amino acid) in the solid state. Theoretical studies on these models were made by taking into account cooperative interactions among the side-chain motions. The theory explains the sudden change in dielectric loss with composition for copolymers of γ-methyl L-glutamate and γ-p-chlorobenzyl L-glutamate. The ranges of cooperative side-chain motion for these copolymers were estimated to be about 11 side chains. This value was compared with each of those of polymer blends of poly(γ-methyl L-glutamate) and poly(γ-p-chlorobenzyl L-glutamate). Differences in dielectric property between the copolymer and the polymer blend are explained by the effective free-volume on the basis of these models. Characteristics of cooperative interactions in chain motions of poly(α-amino acid)s and amorphous polymers were discussed.