Hydroxypropyl cellulose enhanced ionic conductive double-network hydrogels.

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Chemistry

Background:

• Ionic conductive hydrogels are crucial for soft electronics due to their conductivity and mechanical properties.
• Developing hydrogels with enhanced performance is essential for advancing artificial soft electronic devices.

Purpose of the Study:

• To fabricate a dual physically cross-linked double network (DN) hydrogel with high ionic conductivity and mechanical strength.
• To investigate the synergistic effects of hydroxypropyl cellulose (HPC) and prestretching on hydrogel properties.

Main Methods:

• A facile approach was used to create PVA-HPC/SA composite hydrogels, embedding HPC fibers in a PVA/SA matrix.
• Prestretched composite hydrogels were immersed in CaCl2 solution to form PVA-HPC_T/SA-Ca DN hydrogels.
• Mechanical strength, ionic conductivity, cytotoxicity, friction coefficient, and wear resistance were evaluated.

Main Results:

• The PVA-HPC_T/SA-Ca DN hydrogel achieved an excellent tensile strength of 1.4 MPa.
• Ionic conductivity reached 3.49 S/m due to reduced ion migration resistance from HPC and prestretching.
• The hydrogels demonstrated non-cytotoxicity, low friction, and excellent wear resistance.

Conclusions:

• The developed dual physically cross-linked DN hydrogel offers a promising combination of high ionic conductivity and mechanical robustness.
• The synergistic effects of HPC and prestretching are key to achieving superior ion transport and material integrity.
• These advanced hydrogels show significant potential for applications in nerve regeneration and biosensing technologies.