| Summary: | 碩士 === 國立交通大學 === 材料科學(工程)研究所 === 81 === New polymers containing azo dye ,disperse red-19,as a non-
linear optically active chromophore in conjuction with di-
isocyanate(MDI) and dianhydride(PMDA) have been synthesized
.according to the DSC measuremwnts,these polymers exhibit
that the glass transition temperature of DR19-MDI is 100 C and
DR19-PMDA is 90 C.After poling process,the Tg of DR19-PMDA is
shifted to higher temperature. This is due to the cross-
linking reaction of carbonyl acid groups under the
conditions of high temperature and high voltage. We use a
method of interference to predict the refractive indices. The
second harmonic generation coefficients (d33) are calculated
from the Maker-Fringe experiments.The d33 of DR19-MDI is 173pm/
v and of DR19-PMDA is 136 pm/v.From the observation of UV-Vis
spectrums,they show no significant decay in second harmonic
generation for over 100 hours. At last,these polymers are
doped with photoconductor and we can find high photocurrent
by absorbtion of laser light. Thus,these nonlinear optical
polymers might be of photorefractive.
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