NDLI: Enhanced moisture protection of electronic devices by ultra-thin polyimide films

Content Provider	IEEE Xplore Digital Library
Author	Burack, J.J. LeGrange, J.D. Lin, A.W.
Copyright Year	1978
Abstract	Thin films of polyimide which exhibit enhanced resistance to moisture have been fabricated using the Langmuir-Blodgett (LB) technique. LB films are ultrathin organic coatings of thicknesses ranging from tens of angstroms to a micrometer, characterized by high molecular density and a high degree of structural order. The adhesion strength of both LB and spin-coated films of several different polyimides, deposited on fused silica, has been measured by subjecting these films to steam or water, followed by a tape test, and monitoring changes in their UV spectra. The results demonstrate that LB films of polyimide adhere better to fused silica than the spin-coated films. In addition, measurements of water vapor transmission rate through Kapton sheet coated by a monolayer of any of the polyimides show that a monolayer forms a moisture barrier, decreasing the water vapor transmission through the Kapton. Based on these results, the electrical performance of polyimide films has been tested at 85 degrees C, 85% humidity, by measuring leakage current between conducting paths under 180-V bias, on samples which are coated with various combinations of LB and spin-coated polyimide films. Composite films of polyimide consisting of an LB monolayer either underneath or on top of a thick, spin-coated film exhibit superior electrical performance to either a spin-coated or LB film by itself. This may be explained by the improved adhesion and/or decreased water permeability of polyimide LB films.<>
Sponsorship	IEEE Electronic Industries Alliance American Society of Mechanical Engineering (ASME) NBS SAE
Starting Page	214
Ending Page	218
Page Count	5
File Size	473661
File Format	PDF
ISSN	01486411
Volume Number	13
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-03-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Moisture Protection Polyimides Adhesives Silicon compounds Testing Conductive films Transistors Coatings Monitoring
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electronic, Optical and Magnetic Materials Engineering Electrical and Electronic Engineering

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