Shape-Stable Hydrated Salts/Polyacrylamide Phase-Change Organohydrogels for Smart Temperature Management

Area of Science:

• Materials Science
• Polymer Chemistry
• Energy Storage

Background:

• Flexible and environmentally friendly phase-change materials (PCMs) are crucial for effective temperature regulation.
• Existing PCMs often face challenges like solid rigidity and melting leakage, limiting their application in wearable devices.
• Developing novel PCMs with enhanced flexibility and stability is essential for advanced thermal management solutions.

Purpose of the Study:

• To synthesize novel, skin-friendly, flexible phase-change organohydrogels (PCOHs) for wearable temperature management.
• To investigate the structural, thermal, and mechanical properties of the developed PCOHs.
• To demonstrate the potential of PCOHs as an alternative to traditional PCM preparation methods.

Main Methods:

• Synthesis of PCOHs via photoinitiated one-step in situ polymerization of polyacrylamide (PAM) and disodium phosphate dodecahydrate (DPDH).
• Characterization of microstructures and interactions using SEM, FTIR, and XRD.
• Evaluation of thermal properties and energy storage using DSC and TGA; mechanical properties assessed via rheology and compression tests.

Main Results:

• Uniform dispersion of DPDH within the PAM hydrogel network was confirmed.
• PCOHs exhibited high energy transition efficiency and shape stability during thermal cycling.
• The flexible PCOHs demonstrated mechanical robustness and stable performance above the DPDH melting point.

Conclusions:

• A facile method for creating skin-friendly, flexible phase-change glycerol hydrogels was established.
• The developed PCOHs offer a promising alternative to conventional PCM composites for wearable temperature regulation.
• This research provides a new avenue for designing advanced phase-change energy storage materials.