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Preparation and gas barrier properties of cellulose nanocrystal-silica organic–inorganic hybrid gas barrier membranes with crosslinked structures

  • Invited Paper: Functional coatings, thin films and membranes (including deposition techniques)
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Abstract

Cellulose nanocrystal (CNC)-silica organic–inorganic hybrid gas barrier membranes were prepared by sol–gel method, and crosslinked structures of cellulose were introduced by crosslinking reaction using citric acid (CA). The effects of crosslinking agent (CA) content on the gas barrier property of the membranes were investigated. Water vapor transmission rate of C60 (60 wt% CA to CNC) was small (3.6 g m−2 day−1), which is the same order of poly(vinylidene chloride) (PVDC). Oxygen permeability coefficients of C100 (100 wt% CA to CNC) was one-tenth of that of PVDC. Light transmittance of the organic–inorganic hybrid gas barrier membrane (C60) coated on the PET was 95%. And the pencil hardness of the membrane (C60) coated on the PET indicated HB. For the flexibility test, a 2 mm diameter stainless rod was attached to the membrane, and bent 10 times along the rod circle, no cracks were observed in the membrane surface. The hybrid gas barrier membranes exhibit higher oxygen and water vapor barrier properties with transparency, hardness and flexibility.

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Highlights

  • Cellulose nanocrystal (CNC)-silica organic–inorganic hybrid gas barrier membranes were prepared via sol–gel method, and crosslinked structures of cellulose were introduced by crosslinking reaction using citric acid (CA).

  • The effects of crosslinking agent (CA) content on the gas barrier property of the membranes were investigated.

  • C60 (60 wt% CA to CNC) exhibits the highest water vapor barrier property (water vapor transmission rate of 3.6 g m−2 day−1).

  • C100 (100 wt% CA to CNC) indicates the highest oxygen barrier property (oxygen permeability coefficients of 6.2 × 10−19 mol;m m−2 s−1 Pa−1).

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Author contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by KK and TI. The first draft of the manuscript was written by KK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Authors and Affiliations

  1. Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinada, Kobe, 658-0022, Japan

    Koji Kuraoka & Tomomi Iwasaki

  2. Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan

    Koji Kuraoka

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  1. Koji Kuraoka
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  2. Tomomi Iwasaki
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Correspondence to Koji Kuraoka.

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Kuraoka, K., Iwasaki, T. Preparation and gas barrier properties of cellulose nanocrystal-silica organic–inorganic hybrid gas barrier membranes with crosslinked structures. J Sol-Gel Sci Technol 104, 464–469 (2022). https://doi.org/10.1007/s10971-022-05798-w

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  • DOI: https://doi.org/10.1007/s10971-022-05798-w

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