Novel solution-processable optically isotropic colorless polyimidothioethers-TiO2 hybrids with tunable refractive index

作者：Tsai Chia Liang; Yen Hung Ju; Chen Wen Chang; Liou Guey Sheng^*

来源：Journal of Materials Chemistry, 2012, 22(33): 17236-17244.

DOI：10.1039/c2jm32480f

In this study, a new facile synthetic route was developed to prepare polyimidothioethers-nanocrystalline-titania (PITEs-TiO2) hybrid optical films with a high titania content (up to 50 wt%) and thickness (15 +/- 3 mu m) from soluble PITEs containing hydroxyl groups. A series of organosoluble PITEs were prepared from the hydroxy-substituted dithiols and various commercial bismaleimides via Michael polyaddition. The hydroxyl groups at the backbone of the PITEs could provide the organic-inorganic bonding sites and resulted in homogeneous hybrid solutions by controlling the mole ratio of titanium butoxide/hydroxyl group. AFM, TEM, and XRD results indicated the formation of well-dispersed nanocrystalline-titania. The flexible hybrid films were successfully obtained and revealed good surface planarity, thermal dimensional stability, tunable refractive index (1.69 to 1.80 at 633 nm), and high optical transparency. A three-layer antireflection coating based on the hybrid films was prepared and showed a reflectance of less than 0.5% in the visible range, indicating its potential optical applications.

• 出版日期2012