Oxygen permeability of novel organic-inorganic hybrid materials coated on polyethylene

M.G. De Angelis, M. Minelli, F. Doghieri, M. Marini, M. Toselli, F. Pilati

Research output: Contribution to conferencePaperpeer-review

Abstract

The oxygen barrier properties of composite materials, consisting of a 45 μm thick LDPE substrate coated by a thin layer (0.7-1 μm) of nanostructured hybrid organic/inorganic materials based on SiO2 and polyethylene-polyethylene glycol (PE-PEG) block copolymers, obtained via a sol-gel technique have been characterized at 35°C and 50°C. A significant decrease (25-40%) of the oxygen transfer rate has been observed for coated samples with respect to bare substrate both at 35°C and 50°C. The barrier effect was further improved by adding of a second organic component capable of forming hydrogen bonds, namely poly(4-hydroxy styrene) (PHS): use of PHS leads to a remarkable decrease (50 - 70 %) of the oxygen transfer rate both at 35°C and 50°C. It has been determined that the optimal formulation is the one containing 22% of PHS and 33% of silica; the thickness required for the multilayer sample to have the same barrier properties as a 45 μm thick, homogenous film composed of HDPE, oPP and PLA is equal to 2.5, 0.2 and 0.1 μm respectively.
Original languageEnglish
Publication statusPublished - 2008

Keywords

  • Barrier effects
  • Barrier properties
  • Coated sample
  • Hybrid organic/inorganic materials
  • Nano-structured
  • Optimal formulation
  • Organic components
  • Organic-inorganic hybrid materials
  • Oxygen barrier properties
  • Oxygen permeability
  • Oxygen transfer rate
  • Sol-gel technique
  • Thin layers
  • Block copolymers
  • Coated materials
  • High density polyethylenes
  • Hydrogen bonds
  • Materials properties
  • Nanocomposite films
  • Oxygen
  • Polyethylene glycols
  • Polyethylene oxides
  • Silica
  • Styrene
  • Thermoplastics
  • Hybrid materials

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