Synthesis and characterization of novel fluorinated polyimides derived from bis[4-(4′-aminophenoxy)phenyl]-3,5-bis(trifluoromethyl)phenyl phosphine oxide

High solubility and optical transparency of novel polyimides containing 3,3′,5,5′-tetramethyl pendant groups and 4-tert-butyltoluene moiety

“…Recently, considerable attention has been devoted to the fluorinated PIs, especially the trifluoromethyl-containing poly(ether imide)s (PEIs) [17][18][19][20][21][22][23][24][25][26][27][28]. These fluorinated PEIs are usually prepared derived from the trifluoromethyl-substituted bis(ether amine)s [21][22][23][24][25][26][27][28].…”

Novel fluorinated poly(aryl ether)s derived from 1,2-bis(4-(4-fluorobenzoyl)phenoxy)-hexafluorocyclobutane

“…Then, 4,4 0 -((1,2,3,3,4,4-hexafluorocyclobutane-1,2-diyl)bis(oxy))-dibenzoic acid 4 was converted into corresponding chloride 5 with thionyl chloride. As compound 5 is readily hydrolyzed to acid in air, it was prepared and immediately used without further isolation and purification [14]. The next step involved a Friedel-Crafts acylation reaction between 5 and fluorobenzene.…”

High Glass Transition of Fluorinated Polyimides Derived from 4‐(3,4‐Difluorophenyl)‐2,6‐bis(4‐aminophenyl)pyridine

“…[1][2][3][4][5] However, in spite of having excellent combination of properties, most polyimides have some drawbacks, such as insolubility in common organic solvents and deep color, which limited their utility. [1][2][3][4][5] However, in spite of having excellent combination of properties, most polyimides have some drawbacks, such as insolubility in common organic solvents and deep color, which limited their utility.…”