Click modification of azo-containing polyurethanes through polymer reaction: Convenient, adjustable structure and enhanced nonlinear optical properties

摘要

Eight novel polyurethanes with adjustable structures were prepared from two basic polymers; the compounds displayed good solubility in common organic solvents and high thermal stability. The presence of terminal alkyne moieties further improved the thermal stability of the polymers. The resonant d_(33) values of the polymers could be improved up to 1.55 times by attaching suitable isolation spacers, with the achieved highest d_(33) value to be 94.4 pm/V.