Synthesis and Characterization of New Fluorinated Polyimides derived from 9, 10-bis[3'-trifluoromethyl-4' (4''-aminobenzoxy) benzyl] Anthracene

Abstract

A new diamine monomer 9,10-bis [3'-trifluoromethyl-4'(4''-aminobenzoxy) benzyl] anthracene (TFAA) was synthesized that led to a number of novel fluorinated polyimides by thermal imidization route when reacted with different commercially available dianhydrides such as 4,4'-(4,4'-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA), 4,4'-oxydiphthalic anhydride (ODPA), 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA). These polyimides showed very high thermal stability with decomposition temperature (5% weight loss) 500— 550 °C in nitrogen depending on the exact structure. Transparent thin films of these polyimides exhibited tensile strengths of 40—74 MPa, a modulus of elasticity 2.33—2.9 GPa and elongation 5—10% depending on the exact polymer structure. Except for the polymer derived from PMDA, these polymers exhibited good solubility in common organic solvents. The polyimides showed absorbance spectra in the visible region and broad peak in photoluminescence spectra.