A Suitable Model To Predict The Gelation Behaviors Of Gelators In Binary Organic Mixtures

In this work, 1,3: 2, 4-di-(3, 4-dimethyl) Benzylidene Sorbitol(compound A), 1,3: 2,5: 4,6-tirs-(3,4-dichlorobenzylidene)-D-Mannitol(compound B), 2, 4-(3, 4-dichloro) benzylidene-N-propyl-D- gluconamide(compound C), and 2, 4-(3, 4-dichloro) benzylidene-N- dodecyl-D- gluconamide(compound D) were synthesized. All of their structures are different.The gelation abilities of the gelators were evaluated in the binary organic mixtures. The results stated that the gelation behaviors of four gelators were different. X-Ray diffraction was employed to provide an insight into the primary structure of the aggregates. The X-ray diffraction of compound A in xerogel state showed that the gel had a lamellar structure, but X-ray diffraction of compound B in xerogel state showed the gel had a hexagonal closest packed structure. Compound C in xerogel state showed the gel had a lamellar structure, but other peaks were also found, showing that other unknown types of packing modes might exist. Compound D in xerogel state showed that the gel had the only lamellar structure.To shed light on the solvent effect on the gelatinous phenomenon, it was necessary to establish a suitable model to predict the gelation behaviors of low molecular mass organogelators in binary organic mixtures. The Flory–Huggins parameter, Hansen parameters, and Teas plots were used to try to rationalize the gelation behaviors of the gelators in the mixed solvents. The results showed the Teas plots could be used to predict the gelation behaviors of the four gelators in the mixed solvents.In addition, Hansen solubility parameters of the gelators were calculated by three methods. The parameters were relatively accurate by the MATLAB method.