Minimizing Oxygen Permeability in Chitin/Cellulose Nanomaterial Coatings by Tuning Chitin Deacetylation

Yue Ji, Samantha Waters, Eunhyang Lim, Augustus Lang, Peter Ciesielski, Meisha Shofner, John Reynolds, J. Meredith

Research output: Contribution to journalArticlepeer-review

13 Scopus Citations

Abstract

The demand for packaging materials with low gas permeabilities is increasing, but commonly used petroleum-derived single-use plastics are not renewable, biodegradable, or easy to recycle. Nanomaterials composed of chitin and cellulose, which are abundant in nature, have high crystallinities and low oxygen permeabilities (OPs), providing a viable alternative. In this work, we explore how deacetylation conditions of crab shell chitin can be used to tune the charge and size of the resulting chitin nanowhiskers (ChNWs) and the resulting OP of layered film structures. Three deacetylation factors, the concentration of sodium hydroxide (% NaOH), temperature (T), and reaction time, were explored using a three-factor three-level Taguchi design with an orthogonal array. The resulting ChNW suspensions were sequentially spray-coated with suspensions of cellulose nanocrystals (CNCs) onto cellulose acetate (CA) films to form a multilayer structure. We show that ChNWs prepared under more aggressive deacetylation conditions inside the original orthogonal array (higher % NaOH, T, and time) had shorter lengths but the surface charge was significantly influenced only by more aggressive deacetylation outside of the original design conditions. With only ∼10% decrease in the ultimate tensile strength and no significant loss in failure strain, the ChNW-CNC coating resulted in ∼20% decrease in the water vapor transmission rate in comparison to uncoated CA films. The optimization of process conditions resulted in CA-ChNW-CNC films with a 91-99% decrease in OP (132-16.7 cm3·μm/m2/day/kPa vs 1553 cm3·μm/m2/day/kPa for uncoated CA).

Original languageAmerican English
Pages (from-to)124-133
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number1
DOIs
StatePublished - 10 Jan 2022

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

NREL Publication Number

  • NREL/JA-2800-80538

Keywords

  • cellulose nanocrystals
  • chitin nanowhiskers
  • multilayer coating
  • oxygen permeability
  • Taguchi method

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