Processing and characterization of multilayer films of poly(ethylene terephthalate) and surface-modified poly(tetrafluoroethylene)

Date

2007-06-01

Author

Bayram, Göknur

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Multilayer films were prepared from poly(tetrafluoroethylene) (PTFE) and poly(ethylene terephthalate) (PET) films together with using an adhesion promoting layer (tie-layer) consisting of ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer and low density polyethylene (LDPE) blend. Na/naphthalene treatment and subsequent acrylic acid grafting were applied on the surfaces of PTFE for chemical modification. FT-IR spectroscopy, XPS analysis and surface energy measurements were performed to characterize the modified PTFE films. The analyses showed defluorination and oxidation of PTFE surface, and supported the acrylic acid grafting. The surface energy of modified surfaces enhanced with respect to unmodified one, which promoted adhesion. The multilayers were subjected to T-peel tests to measure the adhesion strength between PET and modified PTFE. Peel strength between the films increased with increasing E-MA-GMA amount in the tie-layer. A proportional dependence of peel strength on Na/naphthalene treatment time was observed for multilayers containing acrylic acid grafted or ungrafted PTFE. From SEM analysis, it was observed that the texture of the PTFE surface after modifications became rougher when compared to untreated PTFE. The peeled surfaces were also analyzed by SEM. The micrographs evidence that the energy absorbing mechanism is the plastic deformation of the tie-layer, which is responsible for obtaining high peel strengths.

Subject Keywords

Poly(tetrafluoroethylene), Poly(ethylene terephthalate), Surface modification, Multilayer films, Peel strength, XPS analysis, FT-IR spectroscopy, Scanning electron microscopy

URI

https://hdl.handle.net/11511/35909

Journal

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY

DOI

https://doi.org/10.1163/156856107781061468

Collections

Department of Chemical Engineering, Article

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Citation Formats

G. Bayram, “Processing and characterization of multilayer films of poly(ethylene terephthalate) and surface-modified poly(tetrafluoroethylene),” JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, pp. 883–898, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35909.