弱偶极高效电光生色团的设计、制备与其高分子化

In this project, the theoretic calculation, synthesis and characterizations of the chromophores with low ground state dipole moment (mg) had been carried out, the measurements of their first hyperpolarizability b and mg and the second-order nonlinearity d33 of the doped films had been performed, too. It was demonstrated preliminarily that, the introducing the chromophores with low mg into the poled polymer is one of the effective approaches for overcoming the electrostatic interaction between the chromophores. The effective number density of the chromophores and d33 of the poled films are enhanced. It had been found that, d33 of the poled films, in which contains the chromophore with mg 5.0 Debye, will be increased 15%~40% compared with that 7.5 Debye if they have same magnitude of the b. The optimum range of the mg and the allowed lowest mg of the chromophores used in the poled polymers had been given out. It had been found, the reversion of the vector direction of the excited state dipole moment (me), which caused by the existence of the exocyclic double bond, is one of the basic structural conditions for obtaining the chromophore with low mg. By the way, the effect of the existence of the lock-ring structure and the steric hindrance on the properties of the designed chromophores had been investigated. Based on the above results, a series of the X-type chromophores with low mg had been designed successfully, and b of part of them are over two times of that of the famous chromophore 4-N,N-dimethylamino-4'-nitrostrilbene (DANS).

根据实用性电光极化聚合物的大电光系数、长使用寿命、耐高温和低光传播损耗的要求及由此推出的所用生色团的品质因数之定义，运用双能级模型、键长交替原理、八极理论和辅助基团理论对桥键结构、取代位置与连接方式的研究来探索具有大跃迁偶极矩或存在偶极反转或多极结构的分子体系，以达到低基态偶极矩、高分子超极化率的设计目标，并制备出可有效减小分子间静电相互作用提高极化效率从而增大聚合物电光系数而且具有高分解温度、大透明性/非线性性能比的反应活性生色团，进而研制高性能电光极化聚合物