基于废旧烟头碳材料的复合相变材料制备及其热物理性能OA

Waste cigarette butts were recycled to prepare waste cigarette butt carbon materials(WCBC),which were then incorporated into a mixture of stearic acid(SA),palmitic acid(PA),and paraffin wax(PW)to fabricate PA-SA-PW/WCBC composite phase-change materials(CPCMs).The composite phase-change materials were characterized and their micromorphology,chemical compatibility,heat storage/release performance,and thermal stability were evaluated using scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC),thermogravimetric analysis(TGA),and thermal conductivity analysis.The shape-stability and photothermal conversion capacity of the samples were evaluated,with focus on investigating the effect of WCBC on enhancing the thermal conductivity of the composite phase-change materials.WCBC did not chemically react with the pure phase-change material.The flake-like structure of WCBC enabled the formation of efficient thermal conduction pathways,thereby significantly improving the thermal conductivity.Incorporating 5%mass fraction of WCBC increased the thermal conductivity of the composite phase-change material by 12.80%,and the latent heat of fusion reached 160.72 J/g.After 1180 s of photoirradiation,the temperature of the composite phase-change material was 13.8℃higher than that of pure PA-SA-PW,confirming that WCBC could effectively enhance the photothermal conversion performance of the phase-change material.In summary,the thermal conduction pathways formed by WCBC within the composite phase-change materials can improve their thermal conductivity and heat storage performance,providing a novel approach for developing low-cost composite phase-change materials for temperature regulation in stadium buildings.