Methacryloxyethyl phosphate-grafted expanded polytetrafluoroethylene membranes for biomedical applications
Data(s) |
01/01/2005
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Resumo |
Expanded polytetrafluoroethylene (ePTFE) membranes were modified by graft copolymerization with methacryloxyethyl phosphate (MOEP) in methanol and 2-butanone (methyl ethyl ketone (MEK)) at ambient temperature using gamma irradiation. The effect of dose rate (0.46 and 4.6 kGyh(-1)), monomer concentration (1-40 %) and solvent were studied and the modified membranes were characterized 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), hence 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. (c) 2005 Society of Chemical Industry. |
Identificador | |
Idioma(s) |
eng |
Publicador |
John Wiley & Sons Ltd |
Palavras-Chave | #Polymer Science #Expanded Polytetrafluoroethylene #Methacryloxyethyl Phosphate #Fluoropolymers #Irradiation Grafting #Guided Bone Regeneration #In-vitro #Ptfe Membranes #Ionic Monomers #Polymer-chains #Surface #Copolymers #Deposition #Styrene #Films #C1 #250103 Colloid and Surface Chemistry #730114 Skeletal system and disorders (incl. arthritis) |
Tipo |
Journal Article |