Shape-stabilized phase change material with high phase change enthalpy made of PEG compounded with lignin-based carbon.

Lignin-based porous carbon (LTC), lignin-based hierarchical porous carbon (LTCA) and lignin-based ordered porous carbon (MC) with different pore structures were prepared by template method and chemical activation method using lignin as raw material. The lignin-based carbon composite phase change materials were prepared by vacuum impregnation with polyethylene glycol (PEG) and porous carbon material. The results showed that LTCA has the largest loading capacity of Phase change Materials, which could load 85% of PEG; MC has the largest phase transition enthalpy value (ΔH), which is 89.7 J·g. When the loading amount is the same as 60%, the thermal conductivity of LTCA/PEG is the largest, which is 0.5167 W/mK, 53.8% higher than that of pure PEG. Under constant heating at 70 °C, the pure cotton fabric and the polyurethane coated fabric reached 60 °C in the 4th and 10th second, The cotton fabric coated with composite phase change material reached 60 °C only at 16 s, and a significant slowdown in the temperature rise rate occurred between 50-60 °C. It showed that the cotton fabric coated with composite phase change material had good phase change temperature regulation performance.