NDLI: Polyimides with reduced dielectric anisotropy

Content Provider	IEEE Xplore Digital Library
Author	Labadie, J.W. Lee, H. Boese, D. Yoon, D. Volksen, W. Brock, P. Cheng, Y. Ree, M. Chen, K.R.
Copyright Year	1993
Description	Author affiliation: IBM Res. Div., Almaden Res. Center, San Jose, CA, USA (Labadie, J.W.; Lee, H.; Boese, D.; Yoon, D.; Volksen, W.; Brock, P.; Cheng, Y.)
Abstract	Ordered polyimides have been the subject of considerable interest for thin film applications due to their excellent balance of final properties, however, these polyimides have been shown to have an exceptionally large dielectric anisotropy. Two approaches were examined as a means of obtaining materials with lowered dielectric anisotropies. ATR spectroscopy was used to measure in-plane and out-of-plane refractive indices from which the directional dielectric constant was estimated. In one case, monomers based on hexafluoroisopropylidine were introduced into PMDA at levels /spl les/20 mole%. This afforded some reduction in the in-plane dielectric constant. A more promising approach involved the use of polyimides derived from 2,2'-bis(trifluoromethyl)benzidine (BTFB). The PMDA-BTFB polyimide displayed the best combination of properties, including an estimated in-plane dielectric constant of 2.9 and an out-of-plane dielectric constant of 2.6 at 1 MHz.<>
Starting Page	327
Ending Page	329
File Size	279872
Page Count	3
File Format	PDF
ISBN	0780307941
DOI	10.1109/ECTC.1993.346825
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-06-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Polyimides Anisotropic magnetoresistance Dielectric constant Dielectric thin films Dielectric materials Polymer films Optical films Optical filters Optical refraction Conducting materials
Content Type	Text
Resource Type	Article

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