6F-Bisphenol

The fluorine content, density, critical surface energy, glass transitions, thermal expansion coefficient above and below the glass transition, and 300°C isothermal thermogravimetric stabilities of the fluoromethylene cyanate ester resin system with n = 3, 4, 6, 8, 10 are summarized Table 2.2. Also included for the purpose of comparison are the corresponding data for the aromatic cyanate ester resin based on the dicyanate of 6F bisphenol A (AroCy F, Ciba Geigy). 

The degree of sulfonation was varied by incorporation of varying amounts of 6F-bisphenol instead of 9,9-bis(4 -hydroxyphenyl)fluorene, and sulfonation under conditions where only the fluorene imits were sulfonated, not the 6F-bisphenol units. HFIOO S-PAEK contains no 6F-bisphenol. HF85... 

S-PAEK and HF68 S-PAEK contain 15% and 32% 6F-bisphenol, respectively (Fig. 10). Especially, the polymer with the highest degree of sulfonation (HFIOO S-PAEK) exhibits good conductivity at 50% relative humidity. However, it swells excessively [40]. Within the series described here, the polymer with 15% 6F-bisphenol appears to be the best compromise between swelling and low r.h. conductivity. 

N,N-Dimethylacetamide (DMAc), 4-fluorobenzoic acid, 4-fluorobenzoyl chloride, aluminum chloride, 1 -bromonaphthalene, nitrobenzene, ferric chloride, dimethyl sulfone, 4,4 -dihydroxybiphenyl (DHB), and potassium carbonate were obtained from Aldrich and used without purification. 4,4-(Hexafluoroiso-propylidiene)-diphenol (6F-BPA), 9,9-bis(4-hydroxyphenyl)fluorene (HPF), and l,l-bis(4-hydroxyphenyl)-l-phenylethane (Bisphenol AP) were obtained from Ken Seika Corporation and used without purification. 4,4 -Dihydroxydiphenyl sulfone (DHDS) was obtained from Nachem Incorporated and used without purification. 

Lee and co-workers [9] compared the thermal degradation behaviour of a conventional bisphenol A (BPA) based epoxy resin (Epon 820) with a fluorinated epoxy-resin derivative (Epon 6F) for both the uncured and cured systems. 

Kim et al. [47] prepared three PAEs with pendant -CF3 groups from 2,2 -feiXtrifluoromethyl)-4,4 -dinitro-l,T-biphenyl and bisphenols (BEA, 4,4 -(hexafluoroisopropylidene) diphenol (6F-BPA), and 4,4-biphenol) through meto-activated nucleophilic nitro displacement reaction and investigated their properties. Scheme 2.6 shows the structures of monomers and polymers. 

Hydroxyphenyl)-1 (2H)-phthalazinone " 2,6-dihydroxynaphthalene l,3-bis(4-fluorobenzoyl) benzene Bisphenol 6F... 

The McGrath group [159-171] extensively studied the use of sulfonated 4,4 -dichlorodiphenylsulfone in combination with various bisphenols, such as bisphenol A, bisphenol 6F, hydroquinone, biphenol, and 4,4 -dichloro-diphenylsulfone, for the preparation of ion-exchange materials. The main results of this work were recently pubUshed in a review [170]. In general, the... 

The design and synthesis of four unsymmetric 4,4 -dihalobenzo-r-naphthone monomers and their polymerizations with various bisphenols, 4,4 -isopropylidene phenol (BPA), 4,4 -hexafluoroisopropylidenediphenol (6F-BPA), 9,9-bis(4-... 

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