Light-Colored and Organosoluble Fluorinated Polyimide Derived from 1,2,3,4-Cyclobutanetrtracarboxylic Dianhydride
The alicyclic dianhydrides 1,2,3,4-cyclobutanetrtracarboxylic dianhydride was polymerized with four kinds of fluorinated aromatic diamine, 1,4-bis(4-amino-2-trifluoromethyl phenoxy)diphenyl, 1,4-bis(4-amino-2-trifluoromethylphenoxy) diphenyl ether, 2,2-bis[4-(4- aminophenoxy)phenyl]hexafluoropropane and 2,2-bis[4-(4-amino-2-trifluoromethylphenoxy) phenyl]sulfone respectively, via a two-step polycondensation procedure to prepare four series of fluorinated polyimides(PIs). The PI films exhibited high optical transparency in the visible light region(400-700nm) with the transmittance higher than 80% at 450nm. Especially, the PI-III containing four CF3 group showed the best optical transparency with the transmittance higher than 84.61%. And the PI films showed little absorption at the optocommunication wavelengths of 1.30µm and 1.55µm. In addition, these PIs were soluble in amide-type solvent, even in less polar solvent. The effect of internal linkage group of fluorinated diamine on the solubility of PIs was similar.
Jianmin Zeng, Zhengyi Jiang, Taosen Li, Daoguo Yang and Yun-Hae Kim
Y. H. Lu et al., "Light-Colored and Organosoluble Fluorinated Polyimide Derived from 1,2,3,4-Cyclobutanetrtracarboxylic Dianhydride", Advanced Materials Research, Vols. 199-200, pp. 1973-1977, 2011