The preparation and study of polyureathane and polyester acid on photoconductivity and SHG.

• Main Authors: GANE-HOAM CHEN, 陳建宏
• Other Authors: WHA-ZONG WHANG;ZONG-YEOU WHANG;Z.M. LOU
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/14918059417688312672

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.