2019-Colorless Partially Alicyclic Polyimides Based on Tr?ger’s Base Exhibiting Good Solubility and Dual Fluorescence/Phosphorescence Emission
作者：Yongbing Zhuang,* Ryoji Orita,Eisuke Fujiwara,Yu Zhang,and Shinji Ando*
關(guān)鍵字：Colorless Polyimides, Tr?ger’s Base , Dual Fluorescence/Phosphorescence Emission
論文來源：期刊
具體來源：Macromolecules
發(fā)表時(shí)間：2019年
This study proposes a molecular design and synthetic route to novel
colorless, transparent polyimides that exhibit dual
fluorescence/phosphorescence emission at long wavelengths applicable to
solar energy conversion. Partially alicyclic polyimides (Ac-PI-TBs)
based on Tr?ger’s base (TB) and denoted as Ac-PI-TB-1, Ac-PI-TB-2, and Ac-PI-TB-3 were synthesized by in situ TB formation. The resulting Ac-PI-TBs are
readily soluble in common organic solvents and have good mechanical
properties with tensile strengths of 72.5–102.3 MPa, elongations at
breaks of 12.5–75.0%, low dielectric constants (～2.66) and low thermal
diffusivities (D⊥ ≤ 7.7 × 10–8 m2/s),
and good thermal stability. The films are totally colorless and
transparent with transmittances above 77% at 400 nm. The films also show
dual fluorescence and phosphorescence emissions with Stokes shifts as
large as 11?421 cm–1 at low temperatures. The results
highlight the possible application of these films in the spectral
conversion of unused UV solar radiation to useful visible light.
https://pubs.acs.org/doi/abs/10.1021/acs.macromol.9b00273