Abstract
A thermally conductive phase change material (PCM) was fabricated using polyethylene glycol (PEG) and boron nitride (BN). However, the interfacial adhesion between the BN and the PEG was poor, hindering efficient heat conduction. Grafting polyvinyl alcohol (PVA) onto the surface of BN and cross-linking due to hydrogen bonding between the hydroxyl groups in PVA and oxygen atoms in PEG improved the wettability of fillers. By employing this strategy, we achieved a thermal conductivity value of 0.89 W/mK, a 286% improvement compared to the thermal conductivity of the pristine PEG (0.23 W/mK). Although the latent heat of composites decreased due to the mobility of the polymer chain, the value was still reasonable for PCM applications.
Highlights
Properties of Surface-Modified andPhase change materials (PCMs) are substances that preserve and release thermal energy during the phase change process within a narrow temperature range
The latent heat value, which is important for phase change material (PCM), decreased by 22% because the free volume of the polymer chain decreased due to improved interfacial adhesion and cross-linking
boron nitride (BN)/polyethylene glycol (PEG) was 0.89 W/mK, which improved 286% compared to the raw PEG
Summary
Phase change materials (PCMs) are substances that preserve and release thermal energy during the phase change process within a narrow temperature range. PEG has a low thermal conductivity and weight leakage during phase transition (0.2~0.3 W/mK) [4,5] This low thermal conductivity is disadvantageous for energy storage applications. Phonon scattering can be caused and hindered by creating thermal boundary resistance This negatively affects the conductive and mechanical properties of the polymer composites [21,22]. Polyvinyl alcohol (PVA) is a highly hydrophilic substance because it has many hydroxyl groups in its main chain This polymer is produced through a polymerization and conversion process. The latent heat value, which is important for PCMs, decreased by 22% because the free volume of the polymer chain decreased due to improved interfacial adhesion and cross-linking. The value (137.5 J/g) was still acceptable for PCM applications
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