Abstract
To overcome the application bottleneck of the low thermal conductivity and poor shape stability of organic phase-change materials, a styrene-acrylic emulsion/graphene aerogel supported microencapsulated phase-change composite (SGM composite) was fabricated by hydrothermal, vacuum-assisted impregnation and freeze-drying methods. Graphene aerogel (GA), with an oriented porous network, provided a connected heat transfer network for the SGM composite. Compared with pure paraffin, the as-prepared SGM composite exhibited good thermal conductivity and stability. With a GA content of 14.7 wt%, the thermal conductivity of SGM reached 0.92 W/m∙K, which was 265% higher than that of pure paraffin. The styrene-acrylic emulsion imparted elastic properties to the SGM composite while reinforcing the graphene skeleton, which improved the thermal stability of SGM. Scanning electron microscopy results indicated that the heat transfer skeleton has different pore structure features in different parts. Therefore, a simple steady-state method for measuring the thermal conductivity of an SGM composite was introduced in this paper.
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