Native Cellulose: Structure, Characterization and Thermal Properties

Area of Science:

• Materials Science
• Polymer Science
• Biomaterials Engineering

Background:

• Natural fibers are increasingly used in composite materials.
• Understanding their degradation and thermal properties is crucial for material performance.
• Lignocellulosic fiber characteristics significantly influence composite behavior.

Purpose of the Study:

• To investigate the relationship between cellulose crystallinity and extractive content on lignocellulosic fiber degradation.
• To correlate chemical composition with the physical properties of ten natural fiber types.
• To determine the impact of structural features on thermal stability.

Main Methods:

• Fourier-transform infrared (FTIR) spectroscopy for chemical analysis.
• X-ray diffraction (XRD) for cellulose crystallinity and crystallite size determination.
• Thermogravimetry (TGA) for assessing thermal degradation behavior.

Main Results:

• Higher extractive content correlated with lower cellulose crystallinity and smaller crystallite size, leading to accelerated degradation and reduced thermal stability.
• Increased cellulose crystallinity and crystallite size shifted thermal decomposition to higher temperatures.
• Cellulose crystallite size was identified as a key factor influencing thermal degradation temperature.

Conclusions:

• Extractive content and cellulose crystallite size are critical parameters affecting lignocellulosic fiber degradation and thermal stability.
• Characterization techniques provide valuable insights into fiber structure-property relationships.
• This knowledge aids in selecting and utilizing natural fibers effectively in composite applications.