Synthesis and properties of nonlinear optical side chain soluble polyimides for photonics applications

✍ Scribed by Hyung-Jong Lee; Myung-Hyun Lee; Seon Gyu Han; Hye-Young Kim; Joo-Heon Ahn; Eun-Mi Lee; Yong Hyub Won

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 148 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19980130)36:2<301::aid-pola13>3.0.co;2-s

✦ Synopsis

Aromatic polyimides with side chain nonlinear optical chromophores have been investigated through a facile two-step synthetic route. First, various poly(hydroxy imide)s have been synthesized by direct thermal imidization of diaminophenol dihydrochloride salt and aromatic dianhydride monomers. The resulting polyimides bearing phenolic hydroxy groups were found to react easily with the terminal hydroxy group on the chromophores via the Mitsunobu condensation to give corresponding polyimides with high optical nonlinearities and good solubility in common organic solvents. Detailed physical properties showed that these polyimides have a molecular weight ( M w ) of 31,000 and high glass transition temperature above 220ЊC, ensuring a long-term alignment stability at elevated temperature. The electrooptic coefficients, r 33 , of the electrically poled polymer films were in the range 1.8-7.6 pm/V at 1.3 mm.