Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1314949 | Journal of Fluorine Chemistry | 2009 | 9 Pages |
Novel highly fluorinated polyimides containing hexafluoronaphthylene fragment in the main chain were prepared by the two-stage polymerization of 2,7- and 2,6-diaminohexafluoronaphthalenes with 4,4′-oxydiphthalic anhydride: polycondensation in a solution at 80 °C followed by high-temperature solid-state chain extension. The influence of hexafluoronaphthylene fragment isomerism on the key polyimide features – molecular weight, thermal stability, solubility, optical properties – was characterized. Polyimides based on 2,7-diaminohexafluoronaphthalene or easily accessible mixture of isomeric diamines formed the flexible, transparent, and thermostable films.
Graphical abstractDependence of PI properties on hexafluoronaphthylene fragment isomerism is characterized.Figure optionsDownload full-size imageDownload as PowerPoint slide