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https://doi.org/10.1016/S0022-1139(02)00238-5
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. https://doi.org/10.1016/S0022-1139(02)00238-5 | 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/10635/61553 | ISSN: | 00221139 | DOI: | 10.1016/S0022-1139(02)00238-5 |
Appears in Collections: | Staff Publications |
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