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6FDA2,2'-Bis (3,4-Dicarboxyphenyl) Hexafluoropropane Dianhydride
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References in periodicals archive ?
One fluoro-polyetherimide [6F-BDAF] based on 2,2'-bis(3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and 2,2'-bis [4-(4-aminophenoxy)diphenyl]hexafluoropropane (BDAF) was reported as [LARC.sup.TM] CP1 by NASA [9-10].
Ltd., Japan, and 2,2'-bis [4-(4-aminophenoxy)diphenyl ]hexafluoropropane (BDAF) was received from Chriskev.
For example, in the case of synthesis of [6F-mSED], a fluoro-polyetherimide based on 2,2'-bis (3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and 4,4'-bis(3axninophenoxy) diphenyl sulfone (m-SED), accurately weighed 8.884 gm (0.02 mole) of solid 6FDA was added to an equimolar amount of diamine (8.65 gm) pre-dissolved in freshly distilled NMP to make 20% solid concentrations.