Methacryloxyethyl phosphate-grafted expanded polytetrafluoroethylene membranes for biomedical applications

Wentrup-Byrne, Edeline, Grondahl, Lisbeth, & Suzuki, Shuko (2005) Methacryloxyethyl phosphate-grafted expanded polytetrafluoroethylene membranes for biomedical applications. Polymer International, 54(12), pp. 1581-1588.

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Expanded Poly (tetrafluoroethylene) (ePTFE) membranes were modified by graft copolymerization with methacryloxyethyl phosphate (MOEP) in methanol and 2-butanone (also known as methyl ethyl ketone MEK) at ambient temperature using gamma irradiation. The effect of dose rate (0.46 and 4.6 kGy/h), monomer concentration (1-40%) and solvent were studied and the modified membranes were characterised by weight increase, X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). XPS was used to determine the % degree of surface coverage using the C-F (ePTFE membrane) and the C-C (MOEP graft-copolymer) peaks. Grafting yield as well as surface coverage were found to increase with increasing monomer concentration and were significantly higher for samples grafted in MEK than in methanol solution. SEM images showed distinctly different surface morphologies for the membranes grafted in methanol (smooth) and MEK (globular) indicating phase separation of the homopolymer in MEK. We propose that in our system, the non-solvent properties of MEK for the homopolymer play a more important role than solvent chain transfer reactions in determining grafting outcomes.

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4 citations in Scopus
14 citations in Web of Science®
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ID Code: 3064
Item Type: Journal Article
Refereed: Yes
Keywords: expanded polytetrafluoroethylene, Methacryloxyethyl phosphate, fluoropolymers, irradiation grafting, biomedical applications
DOI: 10.1002/pi.1902
ISSN: 0959-8103
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 John Wiley & Sons
Copyright Statement: The definite version is available on publication at
Deposited On: 16 Jan 2006 00:00
Last Modified: 29 Feb 2012 13:12

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