抄録
Rayleigh light scattering measurements were carried out on acetone solutions of a cellulose diacetate fraction at five different temperatures ranging from 12.61 to 50.34°C. The second virial coefficient A2 was found to decrease almost linearly with increasing in temperature. After determining the temperature derivative of A2, the enthalpy parameter κ1 and the entropy parameter φ1 were estimated: κ1=-0.108 and φ1=-0.051. The results obtained indicate that (i) the present system is exothermic, (ii) in view of the negative sign both for κ1 and φ1, some specific interaction between solute and solvent is present, and (iii) acetone is a “configurationally” poor solvent, but is nevertheless a “thermally” good solvent for cellulose diacetate. The exothermic nature of the present system was considered from the standpoint of solvation due to hydrogen bonding.
