N-doped flexible triazine-based porous polymer for thermal energy storage

Nitrogen atoms has been widely adopted in preparation of porous organic polymers (POPs). In our study, flexible nitrogen porous organic polymers (FNPOPs) with high nitrogen content are synthesized by using acetic acid both as solvent and catalyst. The materials show moderate Brunauer–Emmett–Teller (BET) surface area and outstanding thermal stabilities ( T d : 330°C). FNPOP-2 is prepared into phase change material (PCM) composites by self-adsorption method. From differential scanning calorimetry (DSC) analysis, the PCM composites show high encapsulation ratio (55.2 wt%) and latent heat (135.7 J g −1 ) due to flexible structure and high nitrogen atomic content. Furthermore, the thermal energy storage properties of all PCM composites remained after several thermal cycles. In general, FNPOPs have potential applications in phase change materials adsorption and thermal energy storage.