Fluorescent dyes applicable to agricultural fields have been newly synthesized from 5-carboxy-2-(4-hyroxylphenyl)-2H-benzotriazole and characterized in polymer films. A fluorescent polymer film exhibited an intense fluorescence band at around 410 nm (Φ=0.74) and can efficiently convert ultraviolet light into blue-violet light and shows excellent light fastness under sunlight. By using this blue-violet fluorescent film for tomato cultivation, it has been found that the lycopene content of tomato fruit is significantly increased. This increase in lycopene content is also revealed by color measurement on the surface of the skin. Increase in a * value by 2 to 6 compared to ripe tomato in control area (without film) was exhibited by a color-difference meter.
Poly(3-mercaptopropylsilsesquioxane) and poly(vinylsilsesquioxane) were prepared via the hydrolysis-condensation reactions of 3-mercaptopropyl(trimethoxy)silane and trimethoxy(vinyl)silane catalyzed by formic acid, respectively. These polymers were characterized using gel permeation chromatography and nuclear magnetic resonance spectroscopy. The storage stability was high because formic acid was converted into methyl formate and removed almost completely. Furthermore, large-scale synthesis was possible with this process. Organicinorganic hybrid coating films were prepared on silicon wafer by spin-coating and the following thiol-ene reaction of the side chains on these polymers. Pencil hardness was evaluated to be 3H to 6H which was dependent on the molecular weights of polymers.
Inorganic organic hybrid technology has been discussed to achieve both durability and flexibility in the coating application. In this review, hybrid technology between polysiloxane resin which consists of Si-O bonding and acrylic resin is introduced. Microscopic analysis of the film shows hybridized structure in the nano scale and the high durability of its coating film is discussed.
Fluorine is a unique substituent that dramatically changes the intramolecular electron withdrawing nature and intermolecular interactions of aromatic materials without significantly changing their color or molecular structure. Herein, we introduce the quadrupole moments of aromatic compounds and the corresponding fluorinated compounds and discuss molecular recognitions of non-polar compounds, such as benzene and carbon dioxide, in non-porous crystals of fully fluorinated coordination complexes for their application to solid materials.