【摘要】 为寻求适用于建筑领域的相变材料,本研究提出了具有合适相变温度以及较高相变潜热的癸酸(DA)-十六醇(HD)低共熔相变材料,并以疏水型气相二氧化硅为多孔吸附材料制备出不同吸附率的定型复合相变材料,探究了最大DA-HD吸附率的定型复合相变材料热物性。以疏水型气相二氧化硅为吸附材料,采用多孔材料吸附法制备定型复合相变材料,并利用DSC、FT-IR、SEM和TGA对DA-HD/气相二氧化硅定型复合相变材料的结构和性能进行了表征。结果表明,DA-HD低共熔相变材料中DA与HD的最佳质量比为71.81∶28.19,此时相变温度为23.64℃,相变潜热为174.5 J/g。DA-HD低共熔相变材料被吸附到气相二氧化硅的纳米孔隙中,形成稳定的三维结构,最大吸附率为60%,且吸附过程仅为物理结合,无化学反应。制备的DA-HD/气相二氧化硅定型复合相变材料的相变温度为19.20℃,相变潜热为93.1 J/g,相变温度处于维持室内环境舒适的温区之内,且相变潜热较大,热稳定性良好。更多还原

【Abstract】 In order to find a phase change material suitable for the construction field, this research proposes a decanoic acid(DA)-hexadecanol(HD) eutectic phase change material with suitable phase change temperature and higher latent heat. The hydrophobic fumed silica is used as porous adsorbent materials to prepare the shaped composite phase change material with different adsorption rates, and the thermophysical properties of the shaped composite phase change material with the largest DA-HD adsorption rate have been investigated. Hydrophobic fumed silica is used as the adsorbent material, and the shaped composite phase change material is prepared by the porous material adsorption method. The structure and performance of DA-HD/fumed silica shaped composite phase change material are characterized by DSC, FT-IR, SEM and TGA. Results show that the best mass ratio of DA to HD in DA-HD eutectic phase change material is 71.81:28.19, the phase change temperature is 23.64 ℃, and the phase change latent heat is 174.5 J/g. DA-HD eutectic phase change material is adsorbed into the nanopores of fumed silica to form a stable three-dimensional structure, with a maximum adsorption rate of 60%, and the adsorption process is only physical combination without chemical reaction. The phase change temperature and latent heat of the DA-HD/fumed silica shaped composite phase change material are 19.20 ℃ and 93.1 J/g respectively. The phase change temperature is within the temperature range of maintaining indoor environmental comfort, and the latent heat of phase change is large and the thermal stability is good, applicable to the field of building energy conservation.更多还原