Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/92444
Title: Thermal imidization of poly(pyromellitic dianhydride-4, 4′-oxydianiline) precursors on fluoropolymers modified by surface graft-copolymerization with glycidyl methacrylate
Authors: Yang, G.H.
Zhang, Y. 
Lee, K.S.
Kang, E.T. 
Neoh, K.G. 
Keywords: Adhesion
FEP
Grafting
Hydrophobic surface
Imidization
PI
PTFE
Issue Date: 1-Feb-2003
Citation: Yang, G.H., Zhang, Y., Lee, K.S., Kang, E.T., Neoh, K.G. (2003-02-01). Thermal imidization of poly(pyromellitic dianhydride-4, 4′-oxydianiline) precursors on fluoropolymers modified by surface graft-copolymerization with glycidyl methacrylate. Journal of Fluorine Chemistry 119 (2) : 151-160. ScholarBank@NUS Repository.
Abstract: Composite films of polyimide (PI) and poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) or of PI and Poly(tetrafluoroethylene) (PTFE) were prepared by thermal imidization of the poly(amic acid) (PAA) precursors of poly(pyromellitic dianhydrite-4,4′-oxydianiline) (PMPA-ODA) on glycidyl methacrylate (GMA) graft-copolymerized FEP and PTFE films. The resulting PI/GMA-g-FEP and PI/GMA-g-PTFE composites exhibited T-peel adhesion strength of approximately 7.0 and 6.5 N/cm, respectively, compared to negligible adhesion strength for the laminates prepared from thermal imidization of the PAA on the pristine and the Ar plasma-treated FEP and PTFE films. X-ray photoelectron spectroscopy (XPS) results revealed that both the PI/GMA-g-FEP and PI/FEP-g-PTFE composite films delaminated by cohesive failure inside the FEP and PTFE films, respectively. The so-delaminated PI films with a covalently tethered FEP or PTFE surface layer were highly hydrophobic, having static water contact angles above 140°C. The highly hydrophobic property depends on both the composition and roughness of the delaminated surface. © 2002 Elsevier Science B.V. All rights reserved.
Source Title: Journal of Fluorine Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/92444
ISSN: 00221139
Appears in Collections:Staff Publications

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