Aggregation of Dibutyl Phthalate Molecules in Decalin Solutions Evidenced by Hydrodynamic and Optical Measurements

摘要

Hydrodynamic and optical investigations were performed on the binary dibutyl phthalate (DBP)-decalin liquid mixtures with the DBP content varying from 0 to 100%. This system may be suitable for modelling of the low-molecular-weight polymer behaviour in solution. Macro-characteristics of the system, such as medium viscosity and diffusivity, were evaluated in addition to the molar refraction and the flow birefringence of the system. A non-monotonous function of the molecular diffusivity of the mixture components was revealed. The low-speed ultracentrifugation data yield the dimensions of the mobile units varying with the DBP molar fraction in the mixture. The characteristics of the extreme composition are evaluated and compared with those known for other systems.