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Abstract A kind of silicone rubber (SR)/paraffin (Pa)@silicon dioxide (SiO 2) composite form-stable phase change material (PCM) was developed in this paper. Pa@SiO 2 was obtained by choosing Pa as PCM core microencapsulated in SiO 2 shell based on tetraethoxysilane (TEOS) and γ-aminopropyl triethoxysilane (APTES) as precursors, then Pa@SiO 2 microencapsules were embedded in SR matrix to fabricate SR/Pa@SiO 2 composites. The SiO 2 shell can provide a barrier for the melted Pa and meanwhile have reinforcing effect on SR as inorganic filler. The in-situ modification of SiO 2 shell using APTES owing to the amino groups can not only prevent agglomeration, but also increase interfacial bonding between Pa@SiO 2 with SR. The thermal and mechanical properties of the form-stable PCMs were characterized by differential scanning calorimetry (DSC) and mechanical tests. The results showed that the thermal and mechanical properties of SR/Pa@SiO 2 composites were better than those of SR/Pa and SR/Pa/SiO 2. Leakage test was conducted by heating the prepared composites over the melting temperature of Pa. The SR/Pa@SiO 2 composites were found as form-stable PCM with low leakage rate. The phase change latent heat of the SR/Pa@SiO 2 composites was up to 92.39 J g−1 and the composites can be used for thermal energy storage. Highlights • Developed a novel and efficient process for amino terminated paraffin (Pa)@SiO 2 microencapsules. • The Pa@SiO 2 microencapsules were embedded in silicone rubber (SR) matrix to fabricate SR/Pa@SiO 2 composites. • The SiO 2 shell can provide a barrier for the melted Pa and meanwhile have reinforcing effect on SR as inorganic filler. • The phase change latent heat of the SR/Pa@SiO 2 composites was up to 92.39 J g−1. [ABSTRACT FROM AUTHOR]

Thermally conductive form-stable phase change materials (FSPCMs) were prepared by using ethylene-vinyl acetate (EVA), paraffin, expanded graphite (EG) and carbon fiber (CF) as row materials. Two-dimensional EG and one-dimensional CF were used as thermally conductive fillers. Paraffin and EVA were phase change material (PCM) and supporting material, respectively. Differential scanning calorimetry (DSC) and leakage rate testing results indicated that FSPCMs owned the melting temperature of 45.63 °C and the latent heat of 167.4 J/g. The prepared material had a small leakage rate which was less than 2%. Scanning electron microscope (SEM) results shown that EG and CF possessed excellent compatibility in FSPCMs. In-situ X-ray diffraction (XRD) tests demonstrated that the crystal behaviors of paraffin and EVA were changed with the phase transformation. Thermal conductivity results shown that thermal conductivity of FSPCMs in horizontal orientation was higher than that in longitudinal orientation. EG and CF have synergistic enhancement to thermal conductivity of FSPCMs. [ABSTRACT FROM AUTHOR]