1220959-19-2Relevant academic research and scientific papers
Flexible nanocrystalline-titania/polyimide hybrids with high refractive index and excellent thermal dimensional stability
Liou, Guey-Sheng,Lin, P.O.-Han,Yen, Hung-J.U.,Yu, Yang-Yen,Chen, Wen-Chang
experimental part, p. 1433 - 1440 (2011/03/19)
In this study, a novel synthetic route was developed to prepare polyimide-nanocrystalllne-titania hybrid optical films with a relatively high titania content (up to 50 wt %) and thickness (20-30 μm) from soluble polyimides containing hydroxyl groups, Two series of newly soluble polyimides were synthesized from the hydroxy-substituted diamines with various commercial tetracarboxylic dianhydrides. The hydroxyl groups on the backbone of the polyimides could provide the organic-inorganic bonding and resulted in homogeneous hybrid solutions by controlling the mole ratio of titanium butoxide/hydroxyl group. AFM, SEM, TEM, and XRD results indicated the formation of well-dispersed nanocrystalline-titania. The flexible hybrid films could be successfully obtained and revealed relatively good surface planarity, thermal dimensional stability, tunable refractive index, 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 indicated its potential optical application.
