Interphase Engineering in Lignin-Containing Nanocellulose Composites from Tropical Biomass: Evidence-Weighted...

Area of Science:

• Materials Science
• Biorefining
• Nanotechnology

Background:

• Tropical lignocellulosic residues are key feedstocks for lignin-containing nanocellulose composites.
• Composite performance is not solely predicted by botanical origin or lignin percentage.

Purpose of the Study:

• To review and organize literature on lignin-nanocellulose interfaces.
• To provide a framework for understanding interfacial effects on composite performance.
• To guide application development for tropical biorefineries.

Main Methods:

• Evidence-weighted framework to categorize literature.
• Analysis of interfacial and interphase properties.
• Review of quantitative observations on lignin's impact.

Main Results:

• Controlled lignin enhances hydrophobicity (water contact angle ~78°) and reduces oxygen permeability (200-fold).
• Poly(lactic acid)/lignin-containing cellulose nanofibril (PLA/LCNF) composites show improved strength (37%) and modulus (61%).
• High or poorly distributed lignin negatively impacts fibrillation, viscosity, and network stability.

Conclusions:

• Near-term applications include packaging, barrier papers, and coatings.
• Further validation needed for biomedical and advanced material applications.
• Interfacial function, wet handling, drying, and process integration are critical for biorefinery roadmaps.