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Developing chitin nanocrystals for flexible packaging coatings.

Tuhua Zhong1, Michael P Wolcott1, Hang Liu2

  • 1Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA.

Carbohydrate Polymers
|October 5, 2019
PubMed
Summary
This summary is machine-generated.

Chitin nanocrystals (TOCNs) were tested for flexible packaging. A neat TOCN layer significantly improved oxygen barrier properties in BOPP laminates while maintaining optical transparency.

Keywords:
Barrier propertyChitin nanocrystalsCoatingFilmLaminateRheology

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Flexible packaging relies on materials with excellent barrier properties.
  • Improving barrier performance without compromising transparency is a key challenge.
  • Chitin nanocrystals (TOCNs) offer potential as sustainable barrier enhancers.

Purpose of the Study:

  • To evaluate the use of TEMPO-oxidized chitin nanocrystals (TOCNs) in flexible packaging.
  • To assess TOCNs as an additive in water-based acrylic resin (WBAR) coatings.
  • To investigate TOCNs as a neat layer in multilayered laminates.

Main Methods:

  • TOCNs were incorporated as an additive into WBAR and coated onto biaxially oriented polypropylene (BOPP) films.
  • TOCNs were applied as a neat layer in multilayered BOPP laminates using WBAR as a binder.
  • Oxygen transmission rate (OTR) and optical transparency were measured.

Main Results:

  • TOCN content influenced the flow behavior and shear viscosity of the TOCN/WBAR system.
  • TOCNs dispersed in WBAR did not enhance the oxygen barrier of coated BOPP films.
  • A continuous neat TOCN layer significantly improved the oxygen barrier, reducing OTR by 44% for an 8.33-μm layer.
  • Optical transparency was preserved with the inclusion of TOCNs.

Conclusions:

  • Neat TOCN layers are effective for enhancing the oxygen barrier of flexible packaging laminates.
  • TOCNs are not effective as dispersed additives for improving oxygen barrier in this WBAR system.
  • TOCNs offer a promising route to improve barrier properties of flexible packaging without sacrificing clarity.