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

The hydroxyl groups formed during the reaction of DGEBA (diglycidyl ether o f bisphenol A) and aniline are used for the first time to form crosslinkabl e polyurethane, The very active diisocyanate groups as a pure reagent are o nly introduced to the reaction system at the last step of the crosslinking reaction, which greatly improves the preparation procedure. A very good fil m-forming property was found and a d(33) value as high as 320 pm V-1 was me asured for the poled polymer film. Copyright (C) 2000 John Wiley & Sons, Lt d.