Chemistry in phase change energy storage: Properties regulation on organic phase change materials by covalent bond modification

Phase change materials (PCMs)-based thermal storage systems have a lot of potential uses in energy storage and temperature control. However, organic PCMs (OPCMs) face limitations in terms of regulating phase change temperature, low thermal conductivity, and inadequate functionality for diverse applications. The properties and functions of OPCMs can be effectively regulated through structural and molecular-level modifications. Numerous research publications have focused on the preparation, thermophysical properties, and applications of OPCMs. However, there is currently no comprehensive review of the research progress on the covalent bond modification of OPCMs. This work seeks to systematically summarize and conclude existing research findings results on covalent modification of OPCMs, focusing on the molecular-level principles and methods of modification. By adjusting molecular chain arrangements and introducing specific functional groups, the properties and functionality of OPCMs can be effectively modulated. Furthermore, it presents fresh concepts and practical solutions. The revealed principles and strategies will guide future research, fostering innovation and opening new perspectives in PCM research and application. These advancements hold great significance in enhancing efficiency, intelligence, and environmental sustainability in OPCM research.