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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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纳米二氧化硅改性石蜡微胶囊相变储能材料的研究
DOI: 10.11777/j.issn1000-3304.2015.14410, PP. 692-698
Keywords: 纳米SiO2,丙烯酸酯,石蜡,微胶囊相变材料,热稳定性
Abstract:
以石蜡为芯材,甲基丙烯酸甲酯-丙烯酸共聚物为壁材,纳米SiO2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SiO2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SiO2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SiO2时,微胶囊呈球形且表面光滑,尺寸250~300nm,具有良好的储热能力,相变潜热高达134.79J/g,分解温度比未添加改性纳米SiO2的石蜡微胶囊提高了40K,经过1000次热循环测试,石蜡渗漏率仅2.96%.
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