A series of nonlinear optical chromophores based on the highly thermal and photostable tricyanovinylidenediphenylaminobenzene (TCVDPA) was synthesized and their thermal and optical properties were investigated. Modification of the TCVDPA chromophore with bulky groups provides reduction of dipole–dipole interactions and thus great improvement of the macroscopic electro-optic (EO) response of the polymeric materials obtained by incorporating these derivatives as a guest at high loading in polysulfone. The best result was obtained with chromophore C5, bearing fluorinated aromatic substituents, which shows a doubling of the EO activity at 30 wt% (25 pm V−1 at 830 nm) compared with the pristine TCVDPA. The bulkier the chromophore, the lower the induced plasticization effect (as much as 50 °C difference on the Tg attenuation). Furthermore, all chromophores in this study possess good processability and exhibit high thermal decomposition temperatures (highest Td = 360 °C).
一系列基于高热稳定性和光稳定性的三
氰基
乙烯基联苯胺(TCVDPA)的非线性光学
染料被合成,并对其热学和光学性质进行了研究。通过用笨重的基团对TCVDPA
染料进行改性,可以减少偶极–偶极相互作用,从而显著改善将这些衍
生物高负载作为客体掺入聚砜中所获得的
聚合物材料的宏观电光(
EO)响应。最佳结果出现在具有
氟替代
芳烃基团的
染料C5上,显示出与原始TCVDPA相比,在30 wt%下(830 nm时为25 pm V−1)电光活性提高了一倍。
染料越笨重,诱导的塑化效应越低(Tg衰减差异可以达到50 °C)。此外,本研究中的所有
染料均具有良好的加工性能,并且表现出高热分解温度(最高Td = 360 °C)。