| Summary: | 碩士 === 中國文化大學 === 應用化學研究所 === 87 === The reaction of toluene diisocyanate with fluorescent dye, polypropylene glycol (PPG200, PPG700), dimethyl propionic acid, hydroxypropyl acrylate, KF-351A and other additives to form anionic gas-permeable photosensitive color polyurethane ionomer has been proven by FT-IR spectra.
The experiment results indicate that the average particle size and the viscosity of gas-permeable photosensitive color polyurethane ionomers are seen to increase with increasing the concentration of fluorescent dye and hydroxypropyl acrylate, respectively. This is because the intermolecular interaction of the polar groups of gas-permeable photosensitive color polyurethane ionomer molecule with water molecule makes the free volume of the ionomer molecule become large. The tensile strengths of self-cured film of gas-permeable photosensitive polyurethane ionomers are found to increase with increasing the concentration of fluorescent dye and hydroxypropyl acrylate, respectively, but decreased with increasing the concentration of the KF-351A. The former is due to increase the capability of cross-linking and the latter is due to decreasing the capability of cross-linking.
Experimental data shows that the time of curing under UV absorbance is found to become short, as the concentration of hydroxypropyl acrylate increase. This is the result of increased interaction between free radicals.
|
|---|
