Glycol-lignin (GL), which is obtained from natural conifers by the treatment with poly(ethylene glycol), is expected as a novel material alternating petroleum resources. Composite materials which are prepared by the hybridization of the GL and various engineering plastics such as polyacetals or polyimides show high thermostability and excellent mechanical strength. Resinification of the GL was performed by the polymerization with dicarboxylic acids. Polymerization of an unsaturated polyesters (UP) was inhibited in the presence of GL, because the GL has antioxidizing properties owing to its polyphenolic structure. However, the polymerization of UP was successfully performed by using a capped-GL.
Light-driven supramolecular chiral materials containing an azobenzene moiety as a photoresponsive part and binaphthyl moiety as a chiral part were designed. We found that the dynamic molecular twisting motion of the binaphthyl moiety could be achieved by irradiation of UV or visible light to cause photoisomerization of the azobenzene moiety. The twisting motion induced by the photochromic reaction gave rise to large change in the molecular structure and the value of optical rotation. The chiral materials were demonstrated to behave uniquely as photomodulation of liquid-crystalline helical structures and non-destructive erasable chiroptical memory through photoinduced switching of the dihedral angle of the binaphthyl moiety.
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