Delignified bamboo as skeleton matrix for shape-stable phase change heat storage material with excellent reversible thermochromic response property
Delignified bamboo as skeleton matrix for shape-stable phase change heat storage material with excellent reversible thermochromic response property
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DOI：
10.1016/j.est.2020.101401
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发表时间：
2020-08-01
影响因子：
9.4
通讯作者：
Hu, Dongying
中科院分区：
文献类型：
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作者：
Feng, Nianrong;Liang, Yexin;Hu, Dongying
通过简单的脱木素工艺去除竹纤维间的插层物，得到竹基多孔材料（DB），并以其为载体，浸渍可逆热致变色化合物（BP：BPA：TD），制备了形状稳定的竹基复合可逆热致变色相变材料（TBB-DB）。对竹材和DB的傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）分析表明，竹材脱木素过程中木质素被去除。在扫描电子显微镜显微照片中发现的开放的多孔结构允许TBB的快速浸渍，以实现可逆的热致变色和相变存储性能。表面粗糙度和接触角的减小导致DB的亲水性增加，用于随后将TBB浸渍到DB的多孔结构中。DB还显示出良好的力学性能和热力学稳定性。研究了TBB中显色剂和溶剂的不同配比对TBB-DB可逆热致变色和相变储能性能的影响。TBB-DB 1：4：50表现出较好的可逆热致变色性能和储能性能（潜热最高，熔融和结晶温度有利）。对于TBB-DB 1：4：50，FTIR、XRD、热稳定性分析表明，整个浸渍过程中没有发生化学反应，有利于TBB-DB 1：4：50的可逆热致变色相变储能特性。随着温度的升高，TBB-DB 1：4：50的颜色由玫瑰红变为白色。与DB相比，TBB-DB 1：4：50具有吸热和放热峰，其Δ H-m和Δ H（L+S）分别为113.5 J g（-1）和109.8 J g（-1），表明TBB 1：4：50很好地浸渍到DB中形成复合相变材料。TBB-DB 1：4：50还具有良好的耐久性，使其能够承受长期回收并保持原有的优异性能。
In this study, the porous bamboo material (DB) was obtained by removing the intercalated substance between the fibers through a simple delignification process, and was used as support matrix by impregnating a reversible thermochromic compound (BP: BPA: TD) to prepare a shape-stable bamboo-based composite reversible thermochromic phase change material (TBB-DB). Fourier Transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis of bamboo and DB showed that lignin was removed from bamboo by the delignification process. The open porous structure founded in scanning electron microscopy micrographs allows the rapid impregnation of TBB to achieve reversible thermochromic and phase change storage properties. The reduction in surface roughness and contact angle leads to an increase in the hydrophilicity of the DB for the subsequent impregnation of the TBB into the porous structure of DB. DB also showed good mechanical properties and thermodynamic stability. The effects of different proportions of the color developer and the solvent in the compound TBB on the reversible thermochromic and phase change energy storage properties of TBB-DB were investigated. TBB-DB1:4:50 showed a better reversible thermochromic properties and energy storage properties (the highest latent heat, favorable melting and crystallization temperatures). As for TBB-DB1:4:50, the FTIR, XRD, thermal stability analysis showed that there is no chemical reaction occurred during the entire impregnation process, which is conducive to the reversible thermochromic phase change energy storage characteristics of TBB-DB1:4:50. The color of TBB-DB1:4:50 changed from rose red to white as the temperature increased. Compared with DB, TBB-DB1:4:50 showed endothermic and exothermic peaks, and its Delta H-m and Delta H(L+S )were 113.5 J g(-1) and 109.8 J g(-1), respectively, indicating that TBB1:4:50 was well impregnated into DB to form a composite phase change material. TBB-DB1:4:50 also has good durability, making it able to withstand long-term recycling and maintain the original excellent performance.