Synthesis and Properties of Fluorinated Polyimides

TFDB strongly affects the reduction of amino group reactivity by introducing. -CF3 in the meta (m-) position. The polymerization reactivity of diamines and 

Fundamental Properties of High-Fluorine-Content Polyimide 

The dielectric constant of dry (0%RH atmosphere) 6FDA/TFDB is as low as 2.8 because of its four trifluoromethyl groups (fluorine content 31.3%). The low dielectric constant of fluorinated polyimides results from the low electronic polarizability of fluorine-containing groups and the reduced chain-chain elec- 

An added factor is the additional free volume that can result 

Characteristic 6FDA/TFDB KAPTON-type 11 (PMDA/ODA) 

The CTE of 6FDA/TFDB is a little higher than that of PMDA/ODA. The former has a high CTE because the main chains contain bent hexafluoroisopro-pylidene units. We discuss the thermal expansion behavior of GFDA/TFDB in the next section, comparing it with the low-thermal-expansion fluorinated polyimide PMDA/TFDB. In addition, the refractive index of GFDA/TFDB, 1.556 at 589.3 nm, is much lower than that of the nonfluorinated PMDA/ODA. This is because of its low electronic polarizability, as well as its low dielectric 

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S. Banerjee, M.K. Madhra, A.K. Salunke, D.K. Jaiswal, Synthesis and properties of fluorinated polyimides. 3. Derived from novel l,3- w[3 -trifluoromethyl-4 (4"-amino benzoxy) benzyl] benzene and 4,4-fc 5 [3 -trifluoromethyl-4 (4-amino benzoxy) benzyl] biphenyl, Polymer 44 (3)(2003) 613-622. 

Feiring A E, Auman B C, Wonchoba E R (1993) Synthesis and Properties of Fluorinated Polyimides from Novel 2,2 -bis(fluoroalkoxy)benzidines. Macromolecules 26 2779-2784. 

Synthesis and Properties of Partially Fluorinated Polyimides for Optical Applications... 

G. Hougham, J.G. Tesoroj, J. Shaw, Synthesis and properties of highly fluorinated polyimides. Macromolecules 27 (13) (1994) 3642-3649. 

Ye YS, Chen Yl, Wang YZ. Synthesis and properties of low-dielectric-constant polyimides with introduced reactive fluorine polyhedral oligomeric silsesquioxanes. J. Pol3rm. Sci. Part A 2006 44 5391-5402. 

This chapter describes the synthesis of partially fluorinated polyimides for optical teleconununications applications," " 2 their optical transparency (optical loss), refractive index, and birefringence properties" in addition to their fundamental properties. It also describes their device application as optical interference filters," " optical waveplates," and optical waveguides." -" ... 

Much attention has been paid to the synthesis of fluorine-containing condensation polymers because of their unique properties (43) and different classes of polymers including polyethers, polyesters, polycarbonates, polyamides, polyurethanes, polyimides, polybenzimidazoles, and epoxy prepolymers containing pendent or backbone-incorporated bis-trifluoromethyl groups have been developed. These polymers exhibit promise as film formers, gas separation membranes, seals, soluble polymers, coatings, adhesives, and in other high temperature applications (103,104). Such polymers show increased solubility, glass-transition temperature, flame resistance, thermal stability, oxidation and environmental stability, decreased color, crystallinity, dielectric constant, and water absorption. 

M. He, Y. Zhou, J. Dai, R. Liu, Y. Cui, T. Zhang, Synthesis and nonlinear optical properties of soluble fluorinated polyimides containing hetarylazo chromophores with large hyperpolarizability, Polymer50(16) (2009) 3924-3931. 

S. Banerjee, M.K. Madhra, V. Kute, Polyimides 6 synthesis, characterization, and comparison of properties of novel fluorinated poly(ether imides), J. Appl. Polym. Sci. 93 (2) (2004) 821-832. 

A. Ghosh, S. Banerjee, Synthesis, characterization and comparison of properties of novel fluorinated polyimides derived from bisphenol-A-dianhydride, J. Macromol. Sci. Part A Pure Appl. Chem. 45 (7) (2008) 578-584. 

Ghosh A., Mistri E. A., and Banerjee S. 3—Fluorinated polyimides Synthesis, properties, and applications. In Baneijee S (ed). Handbook of Specialty Fluorinated Polymers, pp. 97-185. Chadds Ford, Pennsylvania, USA William Andrew Publishing, 2015. 

Koiznmi S., Matsnda S.-L, and Ando S. Synthesis, characterization, and optical properties of nniaxiaUy drawn and gold nanoparticle dispersed fluorinated polyimide films. J. Photopolym. Sci. Technol. 15 no. 2 (2002) 231-236. 

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