The study on the preparation and performance of the N-E/DHPD/EG composite phase change materials
To solve the problems of supercooling,phase separation and cycle stability of disodium hydrogen phosphate dodecahydrate,the N-E/DHPD/EG composite phase change materials are developed and prepared,and their properties are characterized,and the law and mechanism of performance change are explored.N-E/DHPD/EG composite phase change materials were prepared by vacuum impregnation.The supercooling degree of the composite phase change material is reduced to less than 1 ℃,and the enthalpy of phase change above 229 J/g is maintained.Under the condition that the enthalpy of phase change does not decrease too much,the super-cooling degree of the composite phase change material has been solved.The mechanism of supercooling problem is revealed from thermodynamic point of view.By adding expanded graphite,the thermal conductivity of the composite phase change material is more than 1.086 W/(m·K),and the cycle stability is better.
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