8. Synthesis of Novel Fluorinated Hyperbranched Polyimides with Excellent Optical Properties
作者：Yu Liu, Yunhe Zhang, Shaowei Guan, Haibo Zhang, Xigui Yue, Zhenhua Jiang
關鍵字：Fluorinated Hyperbranched Polyimide
論文來源：期刊
具體來源：Journal of Polymer Science Part A: Polymer Chemistry, 2009, 47(22): 6269-6279.
發表時間：2009年
Novel anhydride-terminated fluorinated hyperbranched polyimides (FHBPIs) were successfully prepared by condensation of a triamine monomer, 1,3,5-tris(2-trifluoromethyl-4-aminopheoxy) benzene (TFAPOB), and various aromatic dianhydride monomers with different linear length. UV-vis spectra indicate high optical transparency of FHBPI films with a UV-vis absorption edge of 350-395 nm. FHBPIs show increased mechanical properties with the linear length of dianhydride monomer. Young''''s moduli of FHBPI range from 2.37 to 2.56 Gpa, similar to those of their linear analogs. These FHBPI films also present a minimum birefringence value as low as 0.0025 at 650 nm and have low optical absorption in the optical communication wavelengths of 1310 and 1550 nm. Rib-type optical waveguide device fabricated by FHBPI-4d demonstrated an obvious near-field mode pattern of the waveguide.