| Summary: | 碩士 === 中國文化大學 === 應用化學研究所 === 87 === In recent years, owing to environmental protection becoming increasingly important, the organic solvent used as a diluent for the resin is gradually replaced by water, a nonpollutant solvent. For this reason, the development of water-based polyurethane (PU) resins becomes important at present.
The reactions of toluene diisocyanates with fluorescent dyes (4-Hydroxycoumarin), antioxidant agent (Irganox 1076) and other additives form antioxidant fluorescent-dye PU ionomers, and their structures have been proven to occur by FT-IR Spectra. For antioxidant fluorescent-dye PU ionomer solution, the surface tensions are seen to slightly increase with increasing the concentration of antioxidant agent. This is the result of non-polar groups adsorbed at the surface of water, becoming even more order. Under the same experimental condition, the viscosity of antioxidant fluorescent-dye PU ionomer solution is found to decrease with increasing the concentrations of antioxidant agent, as a result of forming the compact conformation or the micelle structure due to intramolecular interation of antioxidant fluorescent-dye PU ionomer molecules themselves, causing their free volume of the PU molecules to become small. In aqueous solution, the average particle sizes of antioxidant fluorescent-dye PU ionomer molecules are seen to increase with increasing the concentrations of antioxidant agent used to prepare this PU ionomer molecule. Since the intermoleculaar interaction between PU ionomer molecules themselves and between PU ionomer molecule and water molecule increases, therefore, the free volume of ionomer molecules becomes large. This is the reason why to explain the average partials size of this ionomer molecule rises.
Experimental data show that both the tensile strength and modulus (100%) of antioxidant fluorescent-dye PU ionomer films are found to increase with increasing the concentrations of antioxidant agent. This is because increased functional groups of antioxidant fluorescent-dye PU ionomer molecules will enhance the crosslinking of PU ionomer molecules. Further, the elongations of antioxidant fluorescent-dye PU ionomer films are also seen to increase with increasing the concentrations of antioxidant agent .
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