Heats of dissociation of mixture of poly(gamma-benzyl L- and D-glutamate).

: The heats of dissociation of stacked side-chain benzyl groups in mixtures of various proportions of poly(gamma-benzyl L- and D-glutamate) have been measured by a differential scanning calorimeter. In order to obtain further information about the dissociation, the heats of solution of poly(gamma-benzyl L- and D-glutamate) were also measured by a twin micro calorimeter at 303 K. The agreement between the heat of dissociation obtained by DSC and that determined by the heat of dissolution is good. The average value of the heat of dissociation of stacking estimated by both methods is about 5 kJ/(mol of pairs of residue.