Multilayer surface construction for enhancing barrier properties of cellulose-based packaging

Area of Science:

• Materials Science
• Sustainable Chemistry
• Biomaterials Engineering

Background:

• Developing eco-friendly packaging with effective barrier properties throughout its lifecycle remains a significant challenge.
• Traditional packaging materials often struggle to balance biodegradability with robust protection against moisture and grease.
• Lignocellulose, a readily available biopolymer, offers potential for sustainable packaging solutions but requires modification to enhance its performance.

Purpose of the Study:

• To develop an eco-friendly, lignocellulose-derived strategy for significantly enhancing the barrier and mechanical properties of cellulose-based packaging.
• To address the inherent porosity and hydrophilicity issues of paper packaging through surface modification.
• To investigate the synergistic effects of combining modified microfibrillated cellulose and nanosized alkali lignin for improved packaging performance.

Main Methods:

• Sequential deposition of oxalic acid modified microfibrillated cellulose (OMFC) onto paper substrates.
• Infiltration of nanosized alkali lignin (NAL) into the OMFC-coated paper structure.
• Characterization of the modified paper's surface morphology, hydrophobicity, water vapor transmission rate, and mechanical strength.

Main Results:

• The developed multilayer surface construction effectively filled voids and created hydrophobic micro/nano-roughness.
• Water vapor transmission rate was reduced by 93%, with the initial water contact angle reaching 113°.
• Tensile strength increased more than four-fold, alongside persistent water and grease resistance.

Conclusions:

• The lignocellulose-derived strategy offers a promising approach for creating high-performance, eco-friendly packaging.
• The synergistic self-bonding and crosslinking between cellulose and lignin components significantly enhance barrier and mechanical properties.
• This method holds great potential for bio-based applications due to the biodegradability, biocompatibility, and recyclability of the materials.