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|Title:||Thermal imidization of poly(pyromellitic dianhydride-4, 4′-oxydianiline) precursors on fluoropolymers modified by surface graft-copolymerization with glycidyl methacrylate|
|Source:||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|
|Appears in Collections:||Staff Publications|
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