Influence of Imidization Method on Properties of Fluorinated Polyimide Films

Abstract

Thermal imidization restricts the application of fluorinated polyimide, but the low temperature imidization could cause a certain impact on its performance. PAA was synthesized with fluorinated monomer 4, 4'-(six fluoro isopropenyl) phthalic anhydride (6FDA) and 4 4'-, two amino -2, 2'- three fluorine biphenyl (TFMB), and then through gradient heating by 80 ℃/1 h, 110 ℃/2 h, 150 ℃/2 h, 200 ℃/1 h, 250 ℃/30 min, 300 ℃/30 min and adding acetic anhydride /pyridine mixture into PAA, two kinds of PI films were prepared and characterized. The test results show that PI films prepared by chemical imidization has better transparency, solubility and mechanical properties, while the PI films prepared by thermal imidization has smaller relative dielectric constant, and higher initial decomposition temperature and higher imidization rate.

Keywords

• fluorinated polyimide
• chemical imidization
• thermal imidization
• flexible display