Synthesis and characterisation of a modified crosslinkable polyurethane non-linear optical polymer

The hydroxyl groups formed during the reaction of DGEBA (diglycidyl ether of bisphenol A) and aniline are used for the first time to form crosslinkable polyurethane. The very active diisocyanate groups as a pure reagent are only introduced to the reaction system at the last step of the crosslinking reaction, which greatly improves the preparation procedure. A very good film-forming property was found and a d₃₃ value as high as 320 pm V⁻ was measured for the poled polymer film. Copyright © 2000 John Wiley & Sons, Ltd.