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Graft Semi-Interpenetrating Polymer Network Phase Change Materials for Thermal Energy Storage

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journal contribution
posted on 12.03.2021, 19:33 by Nima Alizadeh, Royall M. Broughton, Maria L. Auad
Graft semi-interpenetrating polymer networks (IPNs) out of poly­(ethylene glycol), PEG8000-based polyurethane, and acrylic copolymers were synthesized for phase change applications. The chemical structure of the IPN samples was checked with Fourier transform infrared spectroscopy. Thermal properties of the IPNs were studied using differential scanning calorimetry and thermogravimetric analysis. A scanning electron microscope was used to study the surface morphology of the IPN samples. Moreover, polarized optical microscopy and X-ray diffraction were utilized to examine the crystallization properties of the IPNs. The cycling stability of the IPNs was studied as well. Overall, graft-IPN samples show high thermal and cycling stability with excellent shape solidity and no change in crystallization properties compared to the pristine PEG8000. The results confirm the enormous potential of IPNs in a wide variety of phase change applications.