Self-assembled synthesis of microencapsulated paraffin wax phase change materials with excellent thermal properties of calcium carbonate shell

The PW@CaCO3 phase change microcapsules composites with paraffin wax (PW) as core and calcium carbonate (CaCO3) as shell were successfully prepared by self-assembly method. During the preparation process, different core-to-wall ratios and different temperatures affected the morphology, encapsulation rate, thermal stability and thermal conductivity of the microcapsules. Eight sets of microcapsule samples were prepared under different core-to-wall ratios and different temperatures. Of these microcapsule samples, it was found that the microcapsules performed the best thermal performance at a temperature of 65 degrees C and a core-to-wall ratio of 1:1, with an melting enthalpy of 102.8 +/- 1.7 J/g, an crystallization enthalpy of 103.9 +/- 1.8 J/g, an encapsulation rate of 73.7 +/- 1.5% and a thermal conductivity of 1.251 +/- 0.026 W/(m . K). The results showed that the prepared microcapsules have good thermal storage properties and have good prospects for application in the field of energy storage buildings.