Preparation and adhesion of ultrathin polyimide films on polycrystalline silver |
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| Institution: | 1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education of China, Chongqing University, Chongqing 400044, China;2. Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China;1. Institute of Materials Science, Vietnam Academy of Science and Technology, Viet Nam;2. School of Electrical Engineering, Hanoi University of Science and Technology, Viet Nam;3. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Viet Nam;4. University for Fire Fighting and Prevention, Hanoi, Viet Nam;5. Laboratory of Theoretical and Computational Biophysics, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;6. Faculty of Applied Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui, 230009, China;2. Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion & Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;1. Victoria University, Institute for Sustainability and Innovation, Hoppers Lane, Werribee 3030, Victoria, Australia;2. Deakin University, Institute for Frontier Materials, Pigdons Road, Waurn Ponds 3216, Victoria, Australia;3. Department of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan;4. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Methoden der Materialentwicklung, D-12489 Berlin, Germany;5. Australian Synchrotron, 800 Blackburn Road, Clayton 3168, Victoria, Australia;1. TEMA-NRD, Mechanical Engineering Department, University of Aveiro, 3810-193 Aveiro, Portugal;2. INL – International Iberian Nanotechnology Laboratory, 4715-330, Braga, Portugal;3. Hospital Nacional de Parapléjicos (HNP), Servicio de Salud de Castilla-La Mancha (SESCAM), Finca La Peraleda s/n, 45071, Toledo, Spain;4. CICECO, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal;5. Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), 28049, Madrid, Spain;6. Materials Science Factory, ICMM-CSIC, 28049, Madrid, Spain;7. Joint Research Unit “Design and Development of Biomaterials for Neural Regeneration”, HNP-SESCAM, Joint Research Unit with CSIC, Spain;8. CFUM-Center of Physics of the University of Minho, 4710-057, Braga, Portugal |
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| Abstract: | 4.4-oxydianiline (ODA) and 1,2,3,5-benzenetetracarboxylic anhydride (PMDA) were deposited from the vapor phase onto a polycrystalline silver substrate and polymerization of the two components to form ultrathin polyimide films (d≈ 11 Å) was followed by X-ray photoelectron spectroscopy. Both PMDA and ODA chemisorb on the clean surface under partial fragmentation. Co-deposition of ODA and PMDA followed by heating of the substrate led to formation of thermally stable (T<450°C) polyimide films. Our data indicate that adhesion of the polyimide film to the surface involves chemical bonding to fragmented PMDA and/or ODA chemisorbed on the substrate. Our experiments show that polyimide films can be prepared sufficiently thin to allow the application of surface sensitive techniques to probe the substrate-polymer interface and to study the basic physics and chemistry of adhesion. |
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