Accelerated Hydrogel Strengthening: Synergy between Mechanical Training and Lignin Intake

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• High-strength hydrogels are crucial for engineering but suffer from poor stress durability.
• Existing post-treatment methods for hydrogel enhancement are inefficient and time-consuming.

Purpose of the Study:

• To develop a green, efficient, and synergistic method for enhancing hydrogel strength and durability.
• To investigate the mechanisms behind the synergistic enhancement inspired by muscle building.

Main Methods:

• Dynamic stretching of polyvinyl alcohol (PVA) hydrogels in lithium sulfate (LS) solution.
• Synergistic treatment involving stretching and LS solution immersion.
• Multitechnique analyses to characterize structural changes and mechanical improvements.

Main Results:

• Tensile strength, toughness, and Young's modulus increased by 76-fold, 117-fold, and 304-fold, respectively, after 500 stretching cycles (16.7 min).
• The method significantly outperformed single treatments like soaking or training.
• Nanoscale crystalline domains and microscale-ordered polymers were identified as key drivers of macroscopic improvements.

Conclusions:

• The proposed synergistic enhancement technology is rapid, efficient, and adaptable, with LS solution substitutable by other solvents.
• This approach offers a promising solution for overcoming challenges in constructing and applying high-strength hydrogels for engineering applications.