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Crosslinkable-Chitosan-Enabled Moisture-Resistant Multilayer Gas Barrier Thin Film
Simone Lazar1, Omar Garcia-Valdez2, Emily Kennedy2
1Department of Chemistry, Materials Science and Engineering, and Mechanical Engineering, Texas A&M University, College Station, TX, 77843, USA.
Macromolecular Rapid Communications
|January 31, 2019
Summary
A new crosslinkable chitosan and poly(acrylic acid) nanocoating improves oxygen barrier properties in humid conditions. This environmentally friendly coating offers enhanced protection for packaging and electronics.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Chitosan-based films offer good oxygen barrier properties but degrade in high humidity.
- Developing advanced coatings is crucial for protecting sensitive materials in humid environments.
Purpose of the Study:
- To develop a stable, multilayer nanocoating with enhanced barrier properties for humid conditions.
- To functionalize and crosslink chitosan for improved film performance.
Main Methods:
- Layer-by-layer assembly of crosslinkable chitosan (CHQ) and poly(acrylic acid) (PAA) on PET substrates.
- Chitosan functionalization with glycidyl methacrylate to introduce acrylic groups.
- Free radical initiated crosslinking of the multilayer films, confirmed by FTIR and thickness measurements.
Main Results:
- A 10-bilayer (BL) crosslinked CHQ/PAA nanocoating (165 nm) reduced oxygen transmission rate by 36× on PET at 90% relative humidity.
- Achieving similar barrier performance without crosslinking required a 15-BL unmodified chitosan (CH)/PAA film, which was 5× thicker.
- The crosslinked nanocoating demonstrated improved stability and barrier performance in high humidity.
Conclusions:
- Crosslinked CHQ/PAA multilayer nanocoatings provide a superior, thin-film barrier solution compared to non-crosslinked alternatives.
- This environmentally friendly and transparent nanocoating is highly promising for applications in food packaging and flexible electronics protection, especially under high humidity conditions.
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