NDLI: Adhesion enhancement and lamination of polyimide films

Content Provider	IEEE Xplore Digital Library
Author	Stoffel, N.C. Hsieh, M. Kramer, E.J. Volksen, W.
Copyright Year	1994
Abstract	Fully imidized polyimide films were joined together in a lamination process to form a structure that is flexible and has superior thermal stability. This process was demonstrated using the commercially available films KaptonH and UpilexS, as well as spuncast and thermally imidized pyromellitic dianhydride/4-amino phenyl ether (PMDA-ODA) films. When any of these films without prior surface treatment, were placed together and laminated, the interface was very weak, always with a fracture energy G/sub c/<10 J/m/sup 2/ as measured by a T-peel test. However, we were able to form a strong laminate structure by modifying the surface of the base film, causing the region within 2000 /spl Aring/ of the surface to convert to polyamic acid. We subsequently coated this surface modified base film with a thin layer of poly 4,4'-oxydiphenylene oxydiphthalimide (ODPA-ODA), a polyimide with T/sub g/=270/spl deg/C, and laminated two such surface clad films together at 350/spl deg/C. For the case of the KaptonH films, the interfacial fracture energy was too large to be measured with the T-peel test (G/sub c//spl ges/1300 J/m/sup 2/). The ODPA-ODA clad UpilexS films had a G/sub c/=440/spl plusmn/80 J/m/sup 2/. The ODPA-ODA can also be used to bind sequentially spuncast layers together. In this case it is applied as a thin layer onto a fully imidized PMDA-ODA layer before deposition and thermal imidization of a second PMDA-ODA layer. This interlayer increased the fracture energy by about an order of magnitude with the exact amount of increase dependent upon the molecular weight of the interlayer and the annealing temperature.
Sponsorship	IEEE Computer Society
Starting Page	417
Ending Page	422
Page Count	6
File Size	734267
File Format	PDF
ISSN	10709894
Volume Number	19
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-05-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adhesives Lamination Polyimides Surface cracks Surface treatment Energy measurement Testing Thermal stability Laminates Annealing
Content Type	Text
Resource Type	Article
Subject	Engineering

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