Investigating the effect of graphene oxide nanosheets on the barrier properties of high density polyethylene coated by layer-by-layer assembly method

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Sharghi Ehsan; Ehsani Namin Parvin; Javid Mahsa; Ghasemi Ismaeil

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Journal Paper

Paper Information

Journal: Iranian Journal of Polymer Science and Technology Year:2023 | Volume:35 | Issue:6 Page(s): 581-594

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Information Journal Paper

Title

Investigating the effect of graphene oxide nanosheets on the barrier properties of high density polyethylene coated by layer-by-layer assembly method

Author(s)

Sharghi Ehsan | Ehsani Namin Parvin | Javid Mahsa | Ghasemi Ismaeil | Issue Writer Certificate

Keywords

High Density Polyethylene

layer-by-layer assembly

graphene nanosheets

Chitosan

Oxygen transmittance rate

Abstract

Hypothesis: A nanocomposite layer including graphene nanosheets could be used to enhance the barrier properties of High Density Polyethylene through a layer-by-layer assembly method. Planar graphene nanoparticles help to decrease the gas permeability of polyethylene substrates by making a tortuous pathway for gas molecules transmittance.Methods: Two different methods were used to increase the barrier properties of High Density Polyethylene and the results were compared with each other. In the first method, a thin film of polymer nanocomposite including graphene oxide nanoparticles and polyvinyl alcohol was coated on the surface of High Density Polyethylene film using a film applicator. The effective variables in this method were the weight fraction of graphene oxide particles in polyvinyl alcohol and thickness of the nanocomposite layer. In the second method, a layer-by-layer assembly was used. Chitosan solution acted as a positive charge and graphene oxide suspension in water was utilized as a negative charge.Findings: In High Density Polyethylene samples coated by polyvinyl alcohol nanocomposite (10 micrometers), the Oxygen transmittance rate decreased drastically to 3 cm3m2 bar. This decrease was expected due to the structure of polyvinyl alcohol and its inherent barrier properties. By adding graphene oxide into polyvinyl alcohol, the permeability values showed a slight decrease and reached 0.8 cm3 m2 bar.Statistical analysis based on the surface response method for the layer-by-layer method showed that permeability depends on pH, number of bilayers and graphene concentration. At high pH, the graphene oxide sheets take on a smoother and more stretched shape and are more likely to aggregate, which increases permeability.

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