Hemicellulose-rich transparent wood: Microstructure and macroscopic properties

Area of Science:

• Materials Science
• Polymer Science
• Wood Science

Background:

• Hemicellulose is a key component of the natural wood matrix.
• Transparent wood is an emerging structural material with potential applications.
• Understanding the role of wood components is crucial for material development.

Purpose of the Study:

• To demonstrate the importance of hemicellulose in improving the microstructure and properties of transparent wood.
• To investigate the fabrication of transparent wood using a hemicellulose-rich template.
• To provide insights into wood chemical composition for advanced material design.

Main Methods:

• Preparation of a delignified basswood template rich in hemicellulose using a peracetic acid-based process.
• Preservation of the cellulose supramolecular structure and cell wall integrity.
• Infiltration of the template with polymethyl methacrylate (PMMA) to create the wood/polymer composite.

Main Results:

• The hemicellulose-rich template maintained cell wall structure and provided space for polymer infiltration.
• The resulting transparent wood/PMMA composite exhibited high optical transmittance (~85%) and medium haze (~72%).
• The composite demonstrated excellent mechanical strength (165.3 MPa tensile strength) and toughness (1.65 MJ/m³).

Conclusions:

• Hemicellulose plays a vital role in enhancing the optical and mechanical properties of transparent wood.
• The developed method yields a transparent wood composite with desirable characteristics.
• This research offers new perspectives on fabricating advanced transparent wood materials based on wood chemistry.