Preparation and properties of novel fluorinated polyimides based on 2,2?,6,6?-tetrafluorobenzidine

Abstract

Fluorinated polyimides were prepared from 2,2Ј,6,6Ј-tetrafluorobenzidine and four conventional dianhydride monomers by a solution polycondensation reaction followed by a chemical imidization. Polyimide based on 2,2Ј,6,6Ј-tetrafluorobenzidine and hexafluoroisopropylidene bis(3,4-phthalic anhydride) (6FDA) is soluble in organic solvents such as NMP, DMA, DMF, THF, chloroform, and acetone while those based on 2,2Ј,6,6Ј-tetrafluorobenzidine and pyromellitic dianhydride (PMDA), benzophenone-3,3Ј,4,4Ј-tetracarboxylic acid dianhydride (BTDA), diphenylether-3,3Ј,4,4Ј-tetracarboxylic acid dianhydride (ETDA) are not. Polyimide from 2,2Ј,6,6Ј-tetrafluorobenzidine and 6FDA possesses high optical transparency at 350 -700 nm and has a in-plane refractive index of 1.558 at 632.8 nm. All polyimides exhibit glass transition temperatures above 350°C. They also possess very high thermal stability.

Thermal, mechanical, and dielectric properties of novel fluorinated copoly(imide siloxane)s

“…High‐performance polymers such as polyimides can be attributed to their outstanding properties such as excellent thermal and thermo‐oxidative stability, solvent resistance, mechanical and electrical properties 1–6. They are widely used in electronic and microelectronic industries,7–10 aerospace fields11, 12 as well as membranes for gas separation 13.…”