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Gas permeability measurement in polyethylene and its copolymer films

Gholizadeh, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: 2006
  3. Abstract:
  4. In this research, low density polyethylene (LDPE) and poly ethylene-co-vinyl acetate (EVA) were used as polymeric materials. The methods used to produce LDPE and EVA was Film Blowing and ThermalDry Phase Inversion. The amount of permeability, diffusivity and solubility of O2 and CO2 through above polymers were obtained and also the effect of temperature, pressure and film thickness for LDPE was measured. The Barometric method was considered and measurements were based on ASTM standard. To study film cross-section morphology in EVA, Scanning Electron Microscopy (SEM) was applied. From results we considered that the amount of permeability and solubility were decreased by increasing film thickness but diffusivity was increased. However, by increasing temperature, permeability, solubility, and diffusivity were increased. From the results for EVA we considered that adding 28% of vinyl acetate groups to polyethylene chain, increases permeability of O2 and CO2 through the film. From SEM pictures for EVA we realized that the film cross-section structures of the film were as dense as for polyethylene
  5. Keywords:
  6. Copolymers ; Film thickness ; Gas permeability ; Polymer films ; Solubility ; Thermal diffusion ; Copolymer films ; Ethylene-co-vinyl acetate (EVA) ; Polyethylene chains ; Vinyl acetates ; Low density polyethylenes
  7. Source: CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN)
  8. URL: https://www.sciencedirect.com/science/article/abs/pii/S0261306906002585