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New side-chain soluble polyimides bearing Disperse Red One (DR1) groups have been synthesized and characterized. Thin films prepared by spin coating and poled with the corona technique at 200°C have nonlinear optical (NLO) coefficients d33 near 60 pm/V, determined by second-harmonic generation (SHG) at 1064 nm. The thermal stability of the SHG signal for the side-chain polymer has been compared with...