PMID: 9648024Jul 2, 1998Paper

Chemical modification and photograft polymerization upon expanded poly(tetrafluoroethylene)

Journal of Biomaterials Science. Polymer Edition
I NohJ A Hubbell

Abstract

Poly(tetrafluoroethylene) (PTFE) films were surface-modified by employing a reaction solution of benzophenone and sodium hydride in anhydrous dimethylformamide at a temperature of 150 degrees C for 12 h. Electron spectroscopy for chemical analysis (ESCA) showed defluorination, oxygen incorporation, and extensive unsaturation within the treated PTFE surfaces. The suitably of these reduced PTFE films as substrates for graft polymerization was initially assessed via photograft polymerization of the sodium salt of styrenesulfonic acid (SS-Na), which permitted unequivocal surface analysis by the introduction of a new atom, as well as poly(ethylene glycol) monoacrylate (PEG-Ac). All photograpt polymerization was performed employing ultraviolet irradiation with 2,2-dimethoxy-2-phenylacetophenone as an initiator. Photograft polymerization of SS-Na was verified by further reduction of fluorine atomic content and the appearance of new sulfur and sodium atomic peaks on ESCA survey spectra, and that of PEG-Ac was verified by further reduction of fluorine atomic content and increase of atomic percent ratio of O/C from ESCA survey spectra as well as appearance of a new ester peak on high resolution ESCA C 1s spectra. Dynamic water contact an...Continue Reading

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Citations

Oct 28, 2015·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Dany J Munoz-PintoMariah S Hahn
Nov 24, 1999·Journal of Biomedical Materials Research·I NohE R Edelman

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