writer：Xue-meng Fan,Ying Guan,Yingzhan Li,Hou-Yong Yu,Jaromir Marek,Duan-Chao Wang,Ji?í Militky,Zhuan-Yong
keywords：solid?solid phase-change material， cellulose nanocrystals， energy storage， thermal stability ，shape stability
source：期刊
specific source：ACS Applied Nano Materials
Issue time：2020年
Shape-stable solid-solid phase change material (PCM) has attracted much attention due to their excellent thermal properties and shape stability. In this study, cellulose nanocrystal (CNC) was introduced as a high thermal-conductivity nano-skeleton material, and polyethylene glycol (PEG) was used as a solid-liquid phase-change functional material. A green, simple aqueous-phase radical polymerization method was used to synthesize shape-stable CNC-based solid-solid phase change material. The effect of different reaction time on the chemical structure, crystallization ability, thermal stability and phase transformation properties of the PCM was investigated. All PCM samples showed excellent thermal stability when the temperature was lower than that of 300 oC. In particular, the synthesized PCM at 12 h had a melt phase transition temperature of 47.1 oC and phase transition enthalpy up to 82.3 J/g. Besides, the phase change enthalpy and temperature of PCM-12h did not change significantly after 120 heating and cooling scans. The PCM-12h showed thermal reliability, shape stability, controlled phase change behaviors and good heat storage/release properties after thermal treatment. The PCM have potential applications in smart heat storage and temperature control textiles/clothes, building insulation materials and other energy storage fields.