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Synthesis and characterization of side-chain polyimides for second-order nonlinear optics via a post-azo-coupling reaction

โœ Scribed by Yan-Gang Liu; Yu Sui; Jie Yin; Jian Gao; Zi-Kang Zhu; De-Yin Huang; Zong-Guang Wang

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
138 KB
Volume
76
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

A two-step, generally applicable synthetic approach for nonlinear optical (NLO) side-chain polyimides was developed. This included the preparation of a preimidized, organosoluble polyimide with benzene moiety pendant from main chains, followed by the covalent bonding of the NLO chromophores onto the polyimide backbone via a post-azo-coupling reaction. The degree of functionalization of polyimides was estimated by UV-VIS spectroscopy. The glass transition temperature (T g ) of a polyimide decreased by only 10 -20ยฐC after the functionalization, which was much smaller than the decrease in T g when the chromophores were chemically bonded to the polyimide main chains through an ether linkage using a post-Mitsunobu condensation. The solubility and thermal stability of polyimides were also studied.

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