Molecular design and synthesis of branched bichromophore-attached linear fluorinated polyimides for nonlinear optical applications

作者：He Man; Zhou Yuming^*; Gao Yafeng; Wang Yongjuan; Bu Xiaohai; Zhang Tao; Cui Yiping; Zhang Tong

来源：Journal of Materials Science, 2013, 48(9): 3370-3377.

DOI：10.1007/s10853-012-7120-9

A branched structure bichromophore was developed to increase the nonlinearity of optical polymers. The branched bichromophore was incorporated into the polymer backbone to prepare a novel nonlinear optical (NLO) side-chain fluorinated polyimide with high optical nonlinearity and good thermal stability. The novel nonlinear optical side-chain fluorinated polyimide exhibits a large electro-optic (E-O) coefficient (gamma(33)) (34 pm/V at 1550 nm) which is larger than that of the conventional side-chain optical polyimide. This is mainly attributable to an increased chromophore concentration and high polarizing efficiency derived from the branched structure. The branched structure of the bichromophore is incorporated into a polymer backbone to result in a high chromophore concentration. Moreover, the three-dimensional (3D) architecture and large molecular size of the branched bichromophore can spatially shield from strong interchromophore electrostatic interactions to enhance the poling efficiency. The side-chain fluorinated polyimide exhibits excellent solubility in common organic solvents, good film-forming property, high glass-transition temperature (T-g) (190 degrees C) and thermal stability up to 235 degrees C.

• 出版日期2013-5
• 单位东南大学