摘要
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%.
Microencapsulated phase change materials（ Micro PCMs） were prepared using paraffin as core,methyl methacrylate（ MMA） and acrylic acid（ AA） copolymer as shell,and nanosilica as modifier via in situ polymerization. The effects of the nanosilica on the properties of the Micro PCMs were investigated. The Micro PCMs were characterized by Fourier transform infrared spectroscopy（ FTIR）,scanning electron microscopy（ SEM）,differential scanning calorimetry（ DSC） and thermogravimetry（ TGA）. The results show that the nanosilica effectively improves the thermostability of the Micro PCMs. The Micro PCMs modified by 3wt% nanosilica present smooth and spherical morphology with the diameter of 250 ~ 300 nm. The Micro PCMs have a high latent heat of 134. 79 J / g and the degradation temperature is obviously increased by 40 K in comparison with that of the unmodified Micro PCMs,and the paraffin leakage rate of the modified Micro PCMs is only 2. 96% after 1000 times thermal cycling test.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2015年第6期692-698,共7页
Acta Polymerica Sinica
基金
江苏省科技支撑计划(工业)重点项目(项目号BE2012098)
南通市应用研究计划(项目号BK2012005)
住房与城乡建设部研究开发项目(项目号2012-K1-20)资助
关键词
纳米SIO2
丙烯酸酯
石蜡
微胶囊相变材料
热稳定性
Nanosilica
Acrylic ester
Paraffin
Microcapsule phase-change materials
Thermal stability
