2015 年 43 巻 1 号 p. 1-9
We developed new series of organogelators suitable for industrial use through linkage of the molecular design, synthesis, rheological measurements, and elucidation of the viscosity-increasing mechanism of organic compounds. New organogelators, N,N’,N’’,N’’’-1,2,4,5-tetra alkyl/alkenyl pyromellitamides, with four chemical side chains (homo-compounds) and two kinds of chemical chains (hetero-compounds) were synthesized. The solubility and rheological properties of synthesized compounds dissolved in seven kinds of organic solvents (oils) were examined by using visual observation, UV spectrophotometry, and rheological measurements. The solubility of the pyromellitamides was improved by controlling the length of the alkyl chains of the hetero-compounds. The hetero-compounds exhibited significant viscoelastic behavior in solution. To investigate the viscosity-increasing mechanism of the synthesized compounds in solution, self-assembled structures formed in solution due to hydrogen bonding among amide groups were observed using transmission electron microscopy. Differential scanning calorimetric analysis and X-ray diffraction analysis were also employed. Finally, we qualified some synthesized compounds as anti-sedimentation agents for titanium (IV) oxide slurry.