Shape-Stabilized Cellulose Nanocrystal-Based Phase-Change Materials for Energy Storage
2020
Shape-stable solid–solid
phase-change material (PCM) has
attracted much attention due to its excellent thermal properties and
shape stability. In this study, cellulose nanocrystal (CNC) was introduced
as a high thermal-conductivity nanoskeleton 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 times 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 300 °C.
In particular, the synthesized PCM at 12 h had a melt phase transition
temperature of 47.1 °C and a phase transition enthalpy up to
82.3 J/g. In addition, 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 has potential applications in smart heat
storage and temperature control textiles/clothes, building insulation
materials, and other energy storage fields.
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