Photograft polymerization of acrylate monomers and macromonomers on photochemically reduced PTFE films

Insup Noh, Jeffrey A. Hubbell

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The objective of this study was to explore and optimize the photograft polymerization of acrylate monomers and macromonomers upon premodified poly(tetrafluoroethylene) (PTFE) substrates, with a view toward applying these grafted materials as biomaterials. PTFE films were photochemically reduced by exposure to short wavelength ultraviolet (UV) light in the presence of the reducing agents, i.e., diphenyl ketyl radical anion, generated from a solution of benzophenone and sodium hydride in dimethylformamide (Noh et al., J. Polym. Sci. A, Polym. Chem., 35, 1499 (1997)). The photochemically reduced PTFE films were subsequently modified by photograft polymerization of acrylic acid, acrylamide, and poly(ethylene glycol) monoacrylate (PEG-Ac) by employing long wavelength UV irradiation with benzil dimethyl ketal as an initiator. The photochemically reduced PTFE films were good substrates for photograft polymerization, leading to surfaces with chemical compositions close to those of the respective homopolymers as determined by electron spectroscopy for chemical analysis. Photograft polymerization of PEG-Ac on the photochemically reduced surface was also explored with different concentrations (1, 2, 4, 6, and 8%; v/v) and molecular weights (200, 400, 1000, and 2000 g/mol) of PEG-Ac, different durations (5, 10, and 20 min) of long wavelength UV irradiation, and different concentrations (0.1, 0.2, 0.4, and 0.8%; v/v) of benzil dimethyl ketal. Higher concentrations and lower molecular weights of PEG-Ac generally led to more extensive photograft polymerization, whereas the concentration of benzil dimethyl ketal and duration of UV irradiation did not substantially influence the extent of photograft polymerization.

Original languageEnglish (US)
Pages (from-to)3467-3482
Number of pages16
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume35
Issue number16
DOIs
StatePublished - Nov 30 1997

Keywords

  • Acrylamide
  • Acrylic acid
  • Benzophenone
  • Diphenyl ketyl radical anion
  • PEG monoacrylate
  • Photograft polymerization
  • PTFE
  • Surface modification

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

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