Fluorinated-plasma coating on polyhydroxyalcanoate PHBV: Effect on the biodegradation |
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Authors: | Nadia Guerrouani,Taï b Maarouf,Camille M. Kassis |
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Affiliation: | a Institut C. Gerhardt, UMR 5253, ESOM, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France b Department of Chemistry CB#3290 Venable and Kenan Laboratories, University of North Carolina, Chapel Hill, NC 27599-3290, USA |
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Abstract: | Poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) was covered with an hydrophobic layer from plasma polymerization of tetradecafluorohexane, octadecafluorooctane, 3,3,4,4,5,5,6,6,6-nonafluoro-hex-1-ene and 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-oct-1-ene. The water contact angle increased from 74° for untreated films to 98° for the treated films and the surface energy decreased from 40.9 to 18.8 mJ m−2. XPS analysis showed the introduction of 54% fluorine and 3-7% oxygen, the binding energies were assigned to chemically differently bonded carbon atoms. CF2/CF3 molar ratio in plasma layers was lower than that in the monomers due to molecular fragmentation, however the extent of monomer structure retention in PFH, PFO saturated chains is higher than in NFH, TDFO unsaturated chains. Biodegradation tests under aerobic conditions showed that the fluorinated plasma layer inhibited the biodegradation of the PHBV film underneath. |
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Keywords: | Fluorinated monomers Plasma polymerization X-ray photoelectron spectroscopy Polyhydroxyalcanoate Biodegradation |
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