Novel Temperature-Responsive Rosin-Derived Supramolecular Hydrogels Constructed by New Semicircular Aggregates

Abstract

A highly water-soluble rosin-based surfactant (C 14 -MPA-Na) was synthesized. Novel temperature-responsive supramolecular hydrogels were further prepared using C 14 -MPA-Na. The microstructure and the mechanical properties of the hydrogels were investigated. Unexpectedly, instead of the long one-dimensional structure, a new kind of twisted semicircular aggregate was formed in the hydrogels, which was rarely reported. Besides, the hydrogels possessed excellent shear-recovery properties. Upon heating to 40 °C, the hydrogels transformed into viscoelastic solutions, which were constructed by worm-like micelles. By adjusting the temperature, the hydrogels and the viscoelastic solutions could be freely transformed. Nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy were used to further explore the possible self-assembly mechanism of C 14 -MPA-Na. The curved alkane chain which partially overlapped with rosin's rigid skeleton became stretched when heated to 40 °C. The introduction of the rosin rigid skeleton endowed the supramolecular hydrogels with a novel microstructure and contributed to the development of strategies for the utilization of forest resources.

Water-in-Oil Emulsion Gels Stabilized by a Low-Molecular Weight Organogelator Derived from Dehydroabietic Acid

“…This indicates that R-Lys-R forms left-handed chiral aggregates, and this chirality is different from that of the single R-Lys-R molecules and the raw materials. The phenomena of chiral aggregate formation have been extensively investigated in the literature. , For example, Hao et al . reported an amine oxide surfactant that can form chiral fibers in the presence of lithocholic acid.…”

“…The phenomena of chiral aggregate formation have been extensively investigated in the literature. 46,47 For example, Hao et al 48 reported an amine oxide surfactant that can form chiral fibers in the presence of lithocholic acid. Liu et al 49 also investigated the helical nanostructures formed by (Fmoc)-protected glutamic acid triggered by purine nucleobases.…”

Rheological behavior of thread-like fiber solutions formed from a rosin-based surfactant with two head groups

“…The behavior of these fibrous aggregates is different from that of the wormlike micelles, which can bend or twist at any position with any angle of their Bodies. [50][51][52][53] Comparatively, these fibrous structures are more rigid and exhibit a certain tension when bending. This may be the reason why the solution could be gelled at a very low surfactant concentration.…”

Molecular Design, Supramolecular Assembly, and Excellent Dye Adsorption Capacity of Natural Rigid Dehydroabietic Acid-Tailored Amide Organogelators

“…However, it is difficult to self-assemble supramolecular structures in solvents only by dehydroabietic acid. By designing hydrophilic groups, our group obtained novel pH-responsive dehydroabietic acid-tailored phosphate and ammonium salt surfactants and studied their assembly behaviors in an aqueous solution. , Thereafter, Song and Zhai also obtained temperature-responsive worm-like micelles in an aqueous solution by modifying dehydroabietic acid or maleopimaric acid. − …”