Surface modification effects in phase change material-infiltrated attapulgite
Surface modification effects in phase change material-infiltrated attapulgite
复制标题
相变材料渗透凹凸棒石的表面改性效果
DOI：
10.1016/j.matchemphys.2020.123521
复制
发表时间：
2020-11-01
影响因子：
4.6
通讯作者：
Li, Min
中科院分区：
文献类型：
--
作者：
Shi, Junbing;Li, Min
凹凸棒石具有纳米结构，是制备形态稳定的复合相变材料的优良载体材料。然而，凹凸棒石的表面特性对凹凸棒石基FSCPCMS的影响尚不清楚。本文研究了表面改性对不同类型凹凸棒石基FSCPCM性能的影响。首先，用N-(2-aminoethyl)-3-amino-propyltrimethoxysilane对凹凸棒石进行改性。然后，用改性凹凸棒石(M-ATP)吸附三种相变材料(PCM)，制备了一系列FSCPCM。研究了这些FSCPCPM的结晶性能和热性能。结果表明，当采用石蜡或聚乙二醇作相变材料时，表面改性提高了相变材料的结晶度和相变潜热。当PCM的质量分数为40%时，表面改性使石蜡/凹凸棒石FSCPCM和聚乙二醇/凹凸棒石FSCPCM的潜热分别提高了31.5%和27.8%。经过800次冷热循环后，石蜡/M-ATP和聚乙二醇/M-ATP的热性能仍然稳定。通过分析相变材料与凹凸棒石之间的相互作用对实验结果进行了解释。本研究为通过表面改性改善FSCPCM的热性能提供了新的思路。
Attapulgite has nanopomus structure and is an excellent supporting material for the preparation of form stable composite phase change materials (FSCPCMs). However, the effects of surface characteristics of attapulgite on the attapulgite based FSCPCMs were unclear. In this work, the effect of surface modification on the properties of different kinds of attapulgite-based FSCPCMs was investigated. First, N-(2-aminoethyl)-3-amino-propyltrimethoxysilane (KH792) was used to modify attapulgite. Then, a series of FSCPCMs were prepared by adsorbing three kinds of phase change materials (PCM) with modified attapulgite (M-ATP). The crystallization and thermal properties of these FSCPCPMs were investigated. The results showed that, the surface modification improves the crystallinity and the latent heat of the FSCPCMs when paraffin or polyethylene glycol are used as the PCM. When the mass fraction of the PCM is 40%, the surface modification increases the latent heat of the paraffin/attapulgite FSCPCM and the polyethylene glycol/attapulgite FSCPCM by 31.5% and 27.8%, respectively. After 800 cooling and heating cycles, the thermal properties of paraffin/M-ATP and polyethylene glycol/ M-ATP are still stable. The results were explained by analyzing the interaction between the PCM and the attapulgite. This study provides new ideas to improve the thermal properties of FSCPCMs through surface modification.