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Films prepared from electrosterically stabilized nanocrystalline cellulose.

Han Yang¹, Alvaro Tejado, Nur Alam

¹Pulp & Paper Research Centre, Department of Chemistry, McGill University, 3420 University Street, H3A 2A7 Montreal, Quebec, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 10, 2012

Summary

Modified nanocrystalline cellulose films exhibit high transparency and tunable properties. Cross-linking enhances thermal stability and reduces water permeability, showing promise for advanced packaging applications.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Nanocrystalline cellulose (NCC) is a renewable biopolymer with potential applications in advanced materials.
Electrosterically stabilized nanocrystalline cellulose (ENCC) offers improved processability and film-forming capabilities.
Modifying ENCC can tailor its properties for specific high-technology applications.

Purpose of the Study:

To chemically modify electrosterically stabilized nanocrystalline cellulose (ENCC) through oxidation, acidification, and cross-linking.
To investigate the impact of these modifications on the physical and chemical properties of ENCC films.
To evaluate the potential of modified ENCC films for applications in flexible packaging and high-technology products.

Main Methods:

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Periodate oxidation of ENCC to introduce aldehyde groups.

Acidification of ENCC carboxyl groups using ion-exchange resin.

Cross-linking of ENCC using adipic dihydrazide and carbodiimide.

Film preparation via vacuum filtration.

Characterization using UV-visible spectroscopy, tensile testing, thermogravimetric analysis (TGA), water vapor transmission rate (WVTR), and contact angle (CA) studies.

Main Results:

ENCC films demonstrated high transparency (up to 87% transmittance).
Tensile strength increased with higher aldehyde content.
Cross-linked films exhibited enhanced thermal stability and reduced water permeability.
Modified films showed tunable hydrophobic behavior, with superhydrophobicity achieved after trichloromethylsilane treatment.

Conclusions:

Chemical modifications effectively tailored the properties of ENCC films.
The developed transparent films possess desirable characteristics for advanced material applications.
Modified ENCC films are promising candidates for flexible packaging and other high-technology products due to their unique properties.