Mechanically Robust Cellulose-Based Piezoelectric Elastomer Formed by Slidable Polyrotaxane Cross-Linker

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Cellulose possesses high crystallinity, making it a promising material for piezoelectric applications.
• However, native cellulose suffers from poor processability and mechanical weakness, limiting its practical use.
• Developing advanced cellulose-based materials is crucial for next-generation piezoelectric devices.

Purpose of the Study:

• To enhance the applicability of cellulose-based piezoelectric materials.
• To develop a robust cellulose-based piezoelectric elastomer with improved properties.
• To investigate the effects of polyrotaxane cross-linking on cellulose properties.

Main Methods:

• Cross-linking cellulose with polyrotaxane (PR) to create a novel elastomer.
• Investigating the mechanical properties and crystalline structures of the resulting materials.
• Evaluating ferroelectric and piezoelectric properties using polarization hysteresis loops and voltage generation measurements.

Main Results:

• The eHPC25PR75 elastomer exhibited 2.7 times higher toughness (20.4 MJ m-3) compared to eHPC100 (7.57 MJ m-3).
• A 4.2 times higher power density (1.34 μW cm-2) was observed for eHPC25PR75 versus eHPC100 (0.321 μW cm-2).
• The developed elastomer demonstrated piezosensitivity to mechanical vibrations, suitable for robust devices.

Conclusions:

• Cross-linking cellulose with polyrotaxane significantly improves mechanical robustness and piezoelectric performance.
• The enhanced cellulose-based piezoelectric elastomer offers a viable material for high-performance piezoelectric devices.
• This study provides a pathway for designing advanced piezoelectric materials with superior properties.