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.
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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|Item Type:||Journal Article|
|Keywords:||expanded polytetrafluoroethylene, Methacryloxyethyl phosphate, fluoropolymers, irradiation grafting, biomedical applications|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2005 John Wiley & Sons|
|Copyright Statement:||The definite version is available on publication at www3.interscience.wiley.com|
|Deposited On:||16 Jan 2006|
|Last Modified:||29 Feb 2012 23:12|
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