Organosoluble and Light-colored Fluorinated Polyimides from 2,2-Bis[4-(4-amino-2-trifluoromethylphenoxy)phenyl]sulfone and Aromatic Dianhydrides

Chin-Ping Yang; Yu-Yang Su; Kuen-Lin Wu
August 2005
Journal of Polymer Research;Aug2005, Vol. 12 Issue 4, p257
Academic Journal
A new trifluoromethyl-substituted diamine monomer, 2,2-bis[4-(4-amino-2-trifluoromethylpenoxy)phenyl]sulfone ( II), was prepared through the nucleophilic substitution reaction of 2-chloro-5-nitrobenzotrifluoride and 4,4�-sulfonyl diphenol in the presence of potassium carbonate, followed by catalytic reduction with hydrazine and Pd/C. Novel fluorinated polyimides Va�f having inherent viscosities ranging from 0.74 to 1.14 dL/g were synthesized from the diamine II with various aromatic dianhydrides via thermal imidization of poly(amic acid). Most of V series were soluble in the all test solvents, except Vb(H). These polyimide films had strengths at yield of 94�119 MPa, tensile strengths of 90�118 MPa, elongations to break of 10�16%, and initial moduli of 2.0�2.4 GPa. The glass transition temperature ( Tg) of these polymers were in the range of 244�297 ?C, their 10% weight loss temperatures were above 520 ?C under ether nitrogen or air atmosphere, and left more than 45 wt% residue even at 800 ?C in nitrogen. Compared with polyimides VII based on 4,4�-bis(3-aminophenoxy)diphenyl sulfone ( II�), V showed better solubility and lower color intensity, dielectric constant, and moisture absorption. Their films had cutoff wavelengths between 355�402 nm, b* values ranging from 6.8 to 32.9, dielectric constants of 3.32�4.27 (1 MHz), and moisture absorptions in the range of 0.27�0.62 wt%.


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