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以石蜡为芯材,甲基丙烯酸甲酯-丙烯酸共聚物为壁材,纳米Si O2为改性剂,采用原位聚合法制备了石蜡微胶囊相变储能材料,系统研究了添加纳米Si O2对石蜡微胶囊相变材料性能的影响;采用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、示差扫描量热法(DSC)和热重分析(TGA)等对石蜡微胶囊相变材料的化学结构、表面形貌和热性能进行了表征.研究表明,纳米Si O2能够有效提高微胶囊壁材的热稳定性,当丙烯酸酯壁材中添加3%改性纳米Si O2时,微胶囊呈球形且表面光滑,尺寸250~300 nm,具有良好的储热能力,相变潜热高达134.79 J/g,分解温度比未添加改性纳米Si O2的石蜡微胶囊提高了40 K,经过1000次热循环测试,石蜡渗漏率仅2.96%.
Paraffin wax as core material, methyl methacrylate-acrylic acid copolymer as wall material and nano-Si O2 as modifier were used to prepare paraffin microcapsule phase change energy storage materials by in-situ polymerization. The effects of adding nano-Si O2 On the properties of paraffin microcapsule phase change materials. The effects of paraffin microcapsules phase on the properties of paraffin microcapsules were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) The chemical structure, surface morphology and thermal properties of the modified materials were characterized.The results show that the nano-Si O2 can effectively improve the thermal stability of the microcapsule wall material, when 3% modified nano-Si O2 in the acrylic wall material, The microcapsules were spherical and smooth with the size of 250-300 nm. The microcapsules had good heat storage capacity and latent heat of 134.79 J / g. The decomposition temperature was 40 K higher than that of paraffin microcapsules without modified nano-Si O2. 1000 thermal cycling test, paraffin wax leakage rate of only 2.96%.