| In this paper, aiming at the defects of PEG, we select CNTs and CeO2as thermalstrengthening phase, to prepare PEG/CNTs and PEG/CNTs/CeO2composite phase changematerials. The composition and structure of the composite materials were studied. Bycomparing the property differences of the influence of heterogeneous to PEG phasechange thermal physical, we prepare the PEG/SiO2/CNTs microspheres phase changematerials, and study the heat transfer process of the microsphere materials.The components were combined by physical way in PEG/CNTs composite phasechange material. With the increase of CNTs content, phase transition temperature andphase transition enthalpy of composite material decreased. CNTs were added to reduce themass loss rate of the composite material. At the end of the thermal decomposition process,the residual ratio of sample was basically consistent with the CNTs content in phasechange material.The components were combined by physical way in PEG/CNTs/CeO2compositephase change material. CeO2was added to reduce phase transition temperature and phasetransition enthalpy of composite material with same content of CNTs, and to reduce themass loss rate of the composite material. At the end of the thermal decomposition process,the residual ratio of sample was basically consistent with the CNTs and CeO2content inphase change material.Optimal solution is A2B3C2D4E3which obtained by orthogonal experiment, ammoniaconcentration is4.0mol/L, TEOS concentration is0.2mol/L, the amount of the compositephase change materials is0.03g, reaction temperature is30℃, reaction time is60min.The components were combined by physical way. With the increase of CNTs content,phase transition temperature and phase transition enthalpy of composite phase changematerial decreased gradually. SiO2was added to reduce the mass loss rate of thecomposite material. By design and prepare the microspheres phase change materials, weproposal a reasonable amount of SiO2, according to the actual appliance need. |
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