D. S. Thompson, David W. Thompson, R. E. Southward
2002
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Abstract
In the mid-1960’s Coe (1) and Rogers (2) developed the synthetic route to 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) for use in the preparation of hexafluoroisopropylidene-containing aromatic polyimides. Rogers (2,3) reported the synthesis of 6FDA-based polyimides with diamines including 2,2-bis(4-aminophenyl)hexafluoropropane (4,4 ́-6F), 4,4 ́-oxydianiline (ODA), and l,3-bis(4-aminophen-oxy)benzene (1,3(4)-APB). Early interest in 6F-containing polyimides appears to have centered on the fact that the flexible, non-polarizable, and spatially bulky isopropylidene group lowers the effective symmetry of the dianhydride unit due to the availability