Conformations of copoly(γ‐benzyl L‐glutamate–O‐benzyl‐L‐serine)

Four samples of copolymers of γ‐benzyl is L ‐glutamic (BLG) and O ‐benxyl‐ L ‐serine (BLS) were synthesized by changing the mixing ratio of two monomer anhydrides. The conformations of these copolymers in CHCl 3 , containing very small amount of dichloroacetic acid (DCA) necessary to dissolve the sample, were determined by their compositions; the copolymer which is rich in BLG is mostly helical and one which is rich in BLS is mostly in the β conformation. However, in DCA solution the conformations of these copolymers are independent of their composition. The interesting observation was that the copolymer which has least con tent of BLS is richest in β‐conformation.