Effect
of the Alkyl Chains and of the Headgroups on
the Thermal Behavior of Ascorbic Acid Surfactants Mixtures
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Abstract
The role of the alkyl chain length
and of the headgroup on the
thermal behavior of mixtures of ASC8 (ascorbyl octanoate) and ASC16
(ascorbyl hexadecanoate) was investigated through differential scanning
calorimetry, small- and wide-angle X-ray scattering, and Fourier transform
infrared spectroscopy experiments. The formation of two eutectics
and of a peritectic point was found from the phase diagram, and their
structural properties were studied. The results were compared by investigating
the thermal behavior of mixtures of octanoic acid and hexadecanoic
acid. The findings provide insights into the role of the ascorbyl
headgroups on the intermolecular interactions that determine the phase
behavior of the two ascorbic acid based surfactants in the solid state