Effects of solvent on gelation behavior and gel properties of a dihydrazide derivative organogel.

By introducing more polar ethanol as a co-solvent to benzene, solvent effects on gelation behavior and gel properties of N,N'-bis (4-n-alkylo-xybenzoyl) hydrazine (4D16) were investigated herein. Xerogel of 4D16 showed fiber networks in benzene, while slice aggregates in benzene/ethanol mixtures and precipitates of 4D16 in ethanol showed rod-like aggregates. XRD patterns revealed that the aggregation structure of 4D16 translated from cubic phase to lamellar phase gradually with the increase of ethanol content. FT-IR spectra showed that the H-bonding of 4D16 showing lamellar phase was stronger than that in cubic phase. Kinetics of gelation 4D16 of showed that Dfvalue of the aggregates increased firstly and decreased afterwards (1.204→1.522→1.244). Organogel in benzene/ethanol mixtures showed higher thermostability (Tgel) and mechanic properties with the increase of ethanol content. [ABSTRACT FROM AUTHOR]