Superficial modification in recycled PET by plasma etching for food packaging

An oxygen plasma treatment has been used to improve the adhesion of amorphous hydrogenated car- bon (a-C:H) films onto surfaces of recycled poly(ethylene terephthalate) (PET). Modifications produced by the oxygen plasma on the PET surface in chemical bonds and morphol- ogy were investigated by X-ray photoelectron spectroscopy and atomic force microscopy, respectively. Contact angle measurements were used to study the changes in the sur- face wettability. Adhesion of the a-C:H film onto the PET surface was investigated by the tape test method. It was observed that the improvement in film adhesion is in good correlation with the increase in surface roughness, due to plasma etching, and with the appearance of oxygen-related functional groups at the surface. The results of this study indicate that a-C:H-coated recycled PET can be used in food packaging. The a-C:H film could be used as a functional barrier to reduce or prevent migration of contaminants from the polymer to the package content. V C 2009 Wiley Periodicals,

[1]  T. Takagi,et al.  Improvement of oxygen barrier of PET film with diamond-like carbon film by plasma-source ion implantation , 2003 .

[2]  N. Inagaki,et al.  Surface characterization of plasma‐modified poly(ethylene terephthalate) film surfaces , 2004 .

[3]  N. Bhat,et al.  The mechanism of adhesion and printability of plasma processed PET films , 2003 .

[4]  Celso U. Davanzo,et al.  Properties of titanium oxide films obtained by PECVD , 2000 .

[5]  S. Mancini,et al.  Consecutive steps of PET recycling by injection : Evaluation of the procedure and of the mechanical properties , 2000 .

[6]  J. H. Scofield,et al.  Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV , 1976 .

[7]  E. Sacher,et al.  X-ray photoelectron spectroscopy studies of the evaporated aluminum/corona-treated polyethylene terephthalate interface , 1998 .

[8]  Steven Frederick Durrant,et al.  Fluorinated polymer films from r.f. plasmas containing benzene and sulfur hexafluorine , 1992 .

[9]  Alexandre Feigenbaum,et al.  Functional barriers in PET recycled bottles. Part I. Determination of diffusion coefficients in bioriented PET with and without contact with food simulants , 2004 .

[10]  C. Nerín,et al.  Study of barrier properties and chemical resistance of recycled PET coated with amorphous carbon through a plasma enhanced chemical vapour deposition (PECVD) process , 2006, Food additives and contaminants.

[11]  M. Zanin,et al.  PET recycling : Evaluation of the solid state polymerization process , 2006 .

[12]  S. Mancini,et al.  Optimization of Neutral Hydrolysis Reaction of Post-consumer PET for Chemical Recycling , 2004 .

[13]  A. Mas,et al.  Improvement of adhesion of PET fibers to rubber by argon-oxygen plasma treatment , 1998 .

[14]  B. Mutel,et al.  Surface modifications of polycarbonate (PC) and polyethylene terephtalate (PET) by cold remote nitrogen plasma (CRNP) , 1996 .

[15]  J. McLaughlin,et al.  A study of ta-C, a-C:H and Si-a:C:H thin films on polymer substrates as a gas barrier , 2004 .

[16]  E. Selli,et al.  Surface modification of poly(ethylene terephthalate) fibers induced by radio frequency air plasma treatment , 2003 .