Barrier properties of organic-inorganic hybrid coatings based on polyvinyl alcohol with improved water resistance

M. Minelli, M.G. De Angelis, F. Doghieri, M. Rocchetti, A. Montenero

Research output: Contribution to journalArticlepeer-review

Abstract

A comprehensive study of the gas barrier properties of hybrid organic-inorganic coatings formed by polyvinyl alcohol (PVOH) and Si-SiO 2, obtained via sol-gel technique, was carried out. It has been shown that the oxygen, nitrogen and carbon dioxide transfer rates of barrier polymers such as poly(ethylene terephthalate) and oriented polypropylene can be further reduced, by up to two orders of magnitude, with a thin coating (1-2 μm) of PVOH/Si-SiO2. More notably, it has been observed that the material maintains this feature even after a prolonged contact with water, which is a strong solvent for PVOH. Direct moisture sorption measurements show that silica lowers the water uptake of PVOH and inhibits sorption-induced swelling and plas-ticization of the polymer. Correlations between the gas transport properties of the hybrid coatings and factors such as the silica content, the type of polymeric substrate, the nature of penetrant and the temperature have been found, providing guidelines for the selection and design of multilayer materials for packaging applications. POLYM. ENG. SCI., 50:144-153, 2010. © 2009 Society of Plastics Engineers.
Original languageEnglish
Pages (from-to)144-153
Number of pages10
JournalPolymer Engineering and Science
Volume50
Issue number1
DOIs
Publication statusPublished - 2010

Keywords

  • Barrier polymers
  • Barrier properties
  • Comprehensive studies
  • Gas barrier properties
  • Gas transport properties
  • Hybrid coating
  • Moisture sorption
  • Multilayer materials
  • Orders of magnitude
  • Organic-inorganic
  • Organic-inorganic hybrid coatings
  • Oriented polypropylene
  • Packaging applications
  • Polymeric substrate
  • Silica content
  • Sol-gel technique
  • Thin coating
  • Transfer rates
  • Water uptake
  • Water-resistances
  • Carbon dioxide
  • Ethylene
  • Hybrid materials
  • Organic coatings
  • Oxygen
  • Packaging materials
  • Plastic coatings
  • Polyethylene terephthalates
  • Silica
  • Sorption
  • Transport properties
  • Inorganic coatings

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