Cellulose Nanofibers from Softwood, Hardwood, and Tunicate: Preparation-Structure-Film Performance Interrelation

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Cellulose nanofibers (CNF) are advanced nanomaterials with tunable properties.
• The source and preparation of cellulose significantly influence CNF characteristics.
• Understanding these influences is crucial for optimizing CNF-based materials.

Purpose of the Study:

• To investigate structural variations in CNF from softwood, hardwood, and tunicate sources.
• To correlate CNF structure with the properties of derived films.
• To elucidate the impact of preparation methods on CNF and film performance.

Main Methods:

• Cellulose isolation from Picea abies, Eucalyptus grandis × E. urophylla, and Ciona intestinalis.
• CNF preparation via homogenization following enzymatic hydrolysis or TEMPO-mediated oxidation.
• Characterization of CNF structure (chemical, morphological, crystalline) and film properties (optical, mechanical, thermal, hydrophobic).

Main Results:

• Significant structural diversity observed in CNF based on source and preparation.
• Tunicate CNF showed higher purity and degree of polymerization than wood CNF.
• Surface charges introduced by TEMPO oxidation profoundly affected film properties; film density correlated with charge density, and tensile stress with crystallinity.

Conclusions:

• Cellulose source and preparation method are critical determinants of CNF structure.
• CNF structural attributes directly influence the performance of derived films.
• This study provides insights into raw material selection for tailored CNF applications.