Formamide (FA) as modifier

a novel sodium acetate trihydrate (SAT)/formamide (FM) composite phase change material (CPCM) was prepared by melt blending method. The influence of the formamide mass fraction (the same as below) on the phase change enthalpy and the temperature of SAT/FA mixture (matrix) was discussed. The effects of nucleating agent and thickening agent on the phase separation

the degree of supercooling and the release time of composite material were systematically investigated by melting-solidification cycle and step cooling curve. The structure and performance of novel CPCM were characterized by FTIR

XRD and DSC. The results showed that the SAT/FA eutectic mixture formed by adding 25% formamide into SAT. The SAT/FA CPCM formed by adding 2% disodium hydrogen phosphate dodecahydrate (DSP) as the nuclear agent and 2% polyvinyl alcohol (PVA) as thickening agent

had a low degree of supercooling (2.67℃)

long heat release time (10170 s) and excellent cycling stability. Its phase change enthalpy and temperature were 233.9 kJ·kg-1 and 40.88℃

respectively

indicating that it can be applied to floor radiant heating with phase change thermal storage.