Abstract: Foam-based hyper-crosslinked polymers (HCfoams) were synthesized by Scholl coupling method using recycled polystyrene foams as the raw materials and aluminium chloride (AlCl₃) as the catalyst. HCfoams exhibit high specific surface area, permanent porosity and well thermal stability. Shape-stabilized phase change materials (PCMs) composites were obtained by sorption of palmitic acid (PA) into the channel of HCfoams via vacuum impregnation. The specific surface area and pore size distribution of HCfoams were characterized by a nitrogen adsorption/desorption isotherm. The morphology, structure, thermal stability and latent heat of PA@HCfoams were characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD), Fourier transform infraredspectrometer (FT-IR), thermogravimetricanalysis (TG) and differential scanning calorimeter (DSC), respectively. The results show that HCfoam2 has a rich pore volume (1.25 cm³/g), suitable pore size (5.68 nm) and a large specific surface area (1 078 m²/g). PA was successfully adsorbed into the pores of HCfoams by physical binding. The composites have favorable encapsulation rate and phase enthalpies. For palmitic acid@HCfoam2 (PA@HCfoam2), its encapsulation rate reaches up to 77.53 %, and the latent heat values of melting and freezing were 148.50 J/g and 141.62 J/g, respectively, with the corresponding temperature of 66.9 ℃ and 56.2 ℃, respectively. PA@HCfoam2 showed excellent thermal reliability, with a load decreased by only 1.42% after 100 times cycling. In addition, compared with PA, the thermal conductivity of PA@HCfoam2 increased by 12.59%. All these results that the materials have broad prospects in thermal energy storage applications.