Use of thermochromic (TC) materials has demonstrated benefits in reducing the energy demand of buildings. The present study reports the performance comparison of smart reversible thermochromic cement and polymeric mortars. For this purpose, cement, epoxy, and polyester mortars were fabricated with and without thermochromic pigment. After that, the properties such as water absorption, compressive strength, and ultrasonic pulse velocity (UPV) were assessed for all specimens. In addition, analytical characterization, i.e., X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) analyses on the mortars were performed. The color stability, solar reflectance, and temperature tests on mortars after exposure to control and natural environments for 28 and 180 days, respectively, were also performed. The results revealed that compared with thermochromic cement mortars, the thermochromic polymeric mortars retain their color, solar reflectance, and temperature regulation properties, leading to a lower diminution in the control and natural environment. The SEM analysis suggests that the TC pigment microcapsules were firmly embedded in the polymeric matrix leading to a stable chromatic response of mortars. On the other hand, the harsh alkaline cementitious environment leads to degradation and deterioration in the chromatic response of TC pigment. Furthermore, polymeric thermochromic mortars exhibited higher compressive strength, ultrasonic pulse velocity, and lower water absorption values than cement-based thermochromic mortars. Hence, polymeric mortars are more suitable for fabricating smart thermochromic composites.

使用热致变色 (TC) 材料已证明有利于减少建筑物的能源需求。本研究报告了智能可逆热致变色水泥和聚合物砂浆的性能比较。为此目的，使用或不使用热致变色颜料制造水泥、环氧树脂和聚酯砂浆。之后，对所有试样的吸水率、抗压强度和超声脉冲速度(UPV) 等性能进行了评估。此外，对砂浆进行了分析表征，即X射线衍射分析(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、能量色散X射线(EDX)分析。颜色稳定，还分别在暴露于对照和自然环境 28 天和 180 天后对砂浆进行了太阳反射率和温度测试。结果表明，与热致变色水泥砂浆，热致变色聚合物砂浆保留了它们的颜色、太阳反射率和温度调节特性，从而降低了控制和自然环境中的衰减。SEM 分析表明，TC 颜料微胶囊牢固地嵌入聚合物基质中，导致砂浆的色度响应稳定。另一方面，恶劣的碱性水泥环境导致TC颜料的色彩响应退化和恶化。此外，聚合物热致变色砂浆比水泥基热致变色砂浆表现出更高的抗压强度、超声波脉冲速度和更低的吸水率。因此，聚合物砂浆更适合制造智能热致变色复合材料。