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Synthesis and Characterization of Highly Optical Transparent and Low Dielectric Constant Fluorinated Polyimides by Liming Tao; Haixia Yang; Jingang Liu; Lin Fan; Shiyong Yang is a Materials Science article available to read on EtoBox.

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Multitrifluoromethyl-substituted aromatic diamines, 1,1-bis[4-(4 0 -amino-2 0 -trifluoromethylphenoxy)phenyl]-1-(3 00 -trifluoromethylphenyl)-2,2,2-trifluoroethane (12FDA) and 1,1-bis[4-(4 0 -amino-2 0 -trifluoromethylphenoxy)phenyl]-1-[3 00 ,5 00 -bis (trifluoromethyl)phenyl]-2,2,2-trifluoroethane (15FDA) were synthesized, which were employed to react with various aromatic dianhydrides to yield a series of highly fluorinated polyimides. The fluorinated polyimides synthesized showed great solubility with inherent viscosities of 0.47-0.69 dL/g. The strong and tough polyimide films exhibited good thermal stability with the glass transition temperature (T g ) of 209-239 C and outstanding mechanical properties with the tensile strengths of 88-111 MPa and tensile modulus of 2.65-3.17 GPa. Dielectric constants of as low as 2.49 and low moisture absorptions (0.17-0.66%) were measured. The fluorinated polyimide films (7-10 mm in thickness) also showed highly optical transparency with light transmittance at 450 nm of as high as 97.0% and cutoff wavelength of as low as 298 nm. The average refractive indices and birefringence of the fluorinated polyimide films were measured in the range of 1.

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Author

Liming Tao; Haixia Yang; Jingang Liu; Lin Fan; Shiyong Yang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)