A photoinitiator‐free photosensitive polyimide with low dielectric constant

Abstract

AbstractA series of photoinitiator‐free photosensitive polyimides (PSPIs) with lower dielectric constants have been synthesized by reaction of fluorine aromatic diamine, 2,2′‐bis(3‐amino‐4‐hydroxyphenyl)hexafluoropropane diamine (AHHFP) with 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA) and a mixture of various mole ratios of 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA) and 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA) by using solution poly‐condensation reaction at room temperature and further imidization at 180°C. These aromatic polyimides were further acrylated via a reaction with acryloyl chlroride in the presence of triethyl amine to produce negative photoinitiator‐free PSPIs. All the photoinitiator‐free photosensitive polyimides were characterized by FTIR and NMR while their morphologhy was evaluated by X‐ray diffractions study. These newly synthesized PSPIs were evaluated to determine their electrical, thermal, and photolithographic properties. The PSPI (AHHFP‐BTDA‐6FDA [1 : 0.5 : 0.5]) with high mole ratio of 6FDA showed lower dielectric constants of 2.420 at 1 kHz and 2.170 at 1 MHz in capacitance and optical methods, respectively. Further, the acrylated AHHFP‐BTDA showed the highest photosensitivity than other PSPIs. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010