Abstract
A stable host–guest electro-optic (EO) polymer system has been prepared for improving not only the EO effect but also the thermal stability of the effect using a polyisoimide as a host. Disperse Red 1 (DR1) and a polyisoimide (PII) synthesized from 2,2-bis(4-aminophenyl)hexafluoropropane and oxydiphthalic anhydride were used as the guest and the host, respectively. Analyses of a model compound reaction and the host–guest film after annealing at various temperatures show that the reaction between the isoimide groups in the PII and the hydroxyl groups in DR1 occurs at around 140 °C. The EO coefficient obtained at a wavelength of 1.55 μm was 13.7 pm/V from an EO polymer film with 30 wt% of DR1 as added guest. The EO signal was thermostable at high temperature due to the chemical reaction between the host and guest during poling.
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