Dynamical dimer structure and liquid structure of fatty acids in their binary liquid mixture: dodecanoic and 3-phenylpropionic acids system.
Dimer structure and liquid structure of fatty acids in the binary liquid mixture of dodecanoic (LA) and 3-phenylpropionic acids (PPA) were studied through the measurements of DSC, self-diffusion coefficient (D), density, viscosity, 13C NMR spin-lattice relaxation time, small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS). The phase diagram of LA/PPA mixture exhibited a typical eutectic pattern, which means that LA and PPA are completely immiscible in solid phase. In the liquid phase of the LA/PPA mixture, D of LA always differed from that of PPA irrespective of their compositions. This exhibited that, in the liquid phase of the binary mixture of fatty acids giving a complete eutectic in the solid phase, the fatty acid dimers are composed of the same fatty acid species irrespective of their compositions. The liquid structure of the LA/PPA mixture was clarified through the SAXS and also the SANS measurements.
Iwahashi
Makio
M
Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa-ken 228-8555, Japan. maki@kitasato-u.ac.jp
Takebayashi
Shintaro
S
Umehara
Atsushi
A
Kasahara
Yasutoshi
Y
Minami
Hideyuki
H
Matsuzawa
Hideyo
H
Inoue
Tohru
T
Takahashi
Hiroshi
H
D002152:Calorimetry, Differential Scanning; D019281:Dimerization; D005227:Fatty Acids / Q000737:chemistry*; D007850:Lauric Acids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D044367:Phase Transition; D010666:Phenylpropionates / Q000737:chemistry*; D014783:Viscosity
D005227:Fatty Acids; D007850:Lauric Acids; D010666:Phenylpropionates; C030358:lauric acid; C035253:3-phenylpropionic acid