Organic fluorine chemistry

Abstract

This paper is based on a book now in preparation, "Organic Fluorine Chemistry," W. A. Sheppard and C.M. Sharts. W. A. Benjamin, publisher, expected publication date 1968.2 Teflon® and Freon® are registered trademarks of the E. I. du " Vesprin®-foreign trademark. b Aristocort®-registered trademark of Lederle Laboratories.

Influence of fluorination on surface and dielectric characteristics of polyimide thin film

“…The dielectric constant values are strongly influenced by the fluorine content: the dielectric constant decreases as the fluorine content increases. This can be attributed to three of the following effects: changes in hydrophobicity, changes in free volume, and changes in total polarizability [5,6].In this work, we investigate the surface properties and contact angles of fluorinated polyimide thin films before and after fluorination. Changes in glass transition temperature and dielectric characteristics of the film are also studied with respect to the fluorination conditions.…”

A study on dielectric characteristics of fluorinated polyimide thin film

“…At the fluorination treatment, fluorine diffuses only slightly and slowly inside the polyimide and then the diffusing fluorine atom produces active radicals from the hydrocarbon backbone during the reaction time because of the highest electronegative character of fluorine atom. The active radicals lead to an introduction of strong carbon-fluorine (C-F) covalent bonds on the polyimide thin films [12][13][14]18]. From the result of the XPS spectra, Fig.…”

“…Consequently, C-F bonds have relatively stronger than other C-X bonds. Therefore, the intensity of carbon-fluorine groups is increased as a function of the treatment gas [11][12][13][14][19][20][21]. Fig.…”

“…This can be attributed to the following three effects: changes in hydrophobicity, changes in free volume, and changes in total polarizability. The lowest dielectric constant is due to a combination of all three factors [11][12][13][14][15][16].…”

Morphology development of polytetrafluoroethylene in a polypropylene melt (IUPAC Technical Report)

“…Around 19 °C, PTFE exhibits a first-order transition from triclinic to hexagonal crystalline form. The cohesive force between neighbor chains in the hexagonal crystalline lattice is not strong [7][8][9][10][11]. Consequently, the packed PTFE molecules in the crystalline form are unwound by a low level of shear force, leading to fibrils.…”