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Optical Properties of Low Dielectric Constant Polyimides and Effects of Orientation

Published online by Cambridge University Press:  15 February 2011

David C. Rich ,
Peggy Cebe  and
Anne K. St. Clair
David C. Rich
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Peggy Cebe
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Anne K. St. Clair
Affiliation:
Materials Division, NASA Langley Research Center, Hampton, VA 23681
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Abstract

Control of the refractive index in low dielectric constant polyimides through modification of chemistry and structure was investigated. The optical refractive indices of several low dielectric constant polyimides were measured, and the effects of orientation on optical anisotropy were determined. Refractive index in these polyimides was found to decrease with increasing fluorine content due primarily to the low electronic polarizability of the fluorine-carbon bonds. In zone drawn polyimides, refractive index was found to increase substantially in the direction of the draw, but decrease substantially normal to the draw direction. This was explained in terms of the preferential alignment of the polymer chains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 323: Symposium J – Electronic Packaging Materials Science VII , 1993 , 301
Copyright
Copyright © Materials Research Society 1994

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