Simple synthetic route to soluble polyimides via nitro-displacement reaction and their second-order nonlinear optical properties
Journal of Materials Chemistry Pub Date: DOI: 10.1039/A902230I
Abstract
Nonlinear optical (NLO) functionalized polyimides were directly synthesized using the nitro-displacement reaction between an alkanediol monomer and a diimide monomer without a thermal curing step. The polyimides were soluble in aprotic polar solvents such as DMSO, DMAc, DMF and NMP, and showed glass transitions at temperatures between 172 and 198?°C. We observed good thermal stability up to around 300?°C (at 5% weight loss) for the polymers. The weight average molecular weights of the resulting polymers were determined to be 10?400–15?100 (M
w
/M
n
= 1.84–2.00). The poled polymer films showed good nonlinearity (d
33
= 76?pm?V
–1
) in the Maker fringe method for the second harmonic generation (SHG).
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Journal Name：Journal of Materials Chemistry
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CAS no.: 89640-58-4
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