Zeng Kai, Xue Chang, Wu Jinbo, Wen Weijia
Materials Genome Institute, Shanghai University, Shanghai 200444, China.
Faculty of Materials Science, Shenzhen MSU-BIT University, Shenzhen 518115, China.
Polymers (Basel). 2024 Aug 22;16(16):2385. doi: 10.3390/polym16162385.
This study introduces the synthesis and detailed characterization of a novel thermochromic material capable of reversible alterations in its thermotropic transmittance. Through an emulsion polymerization process, this newly developed material is composed of 75-85% octadecyl acrylate and 0-7% allyl methacrylate, demonstrating a pronounced discoloration effect across a narrow yet critical temperature range of 24.5-39 °C. The synthesized powder underwent a battery of tests, including differential scanning calorimetry and thermogravimetric analysis, as well as scanning electron microscopy. These comprehensive evaluations confirmed the material's exceptional thermal stability, uniform particle size distribution, and strong anchoring properties. Building upon these findings, we advanced the development of thermochromic polyvinyl butyral films and laminated glass products. By utilizing a coextrusion technique, we integrated these films into laminated glass, setting a new benchmark against existing glass technologies. Remarkably, the incorporation of thermochromic PVB films into laminated glass led to a significant reduction in solar irradiance of 20-30%, outperforming traditional double silver low-emissivity glass. This achievement demonstrates the exceptional shading and thermal insulation properties of the material. The research presented herein not only pioneers a valuable methodology for the engineering of smart materials with tunable thermotropic transmittance but also holds the key to unlocking enhanced energy efficiency across a spectrum of applications. The potential impact of this innovation on the realm of sustainable building materials is profound, promising significant strides toward energy conservation and environmental stewardship.
本研究介绍了一种新型热致变色材料的合成及详细表征，该材料能够在其热致透光率方面发生可逆变化。通过乳液聚合工艺，这种新开发的材料由75 - 85%的丙烯酸十八酯和0 - 7%的甲基丙烯酸烯丙酯组成，在24.5 - 39°C这个狭窄但关键的温度范围内呈现出明显的变色效果。合成的粉末进行了一系列测试，包括差示扫描量热法、热重分析以及扫描电子显微镜分析。这些全面的评估证实了该材料具有出色的热稳定性、均匀的粒径分布和强大的锚固性能。基于这些发现，我们推进了热致变色聚乙烯醇缩丁醛薄膜和夹层玻璃产品的开发。通过采用共挤出技术，我们将这些薄膜集成到夹层玻璃中，为现有玻璃技术树立了新的标杆。值得注意的是，将热致变色聚乙烯醇缩丁醛薄膜纳入夹层玻璃导致太阳辐照度显著降低20 - 30%，优于传统的双银低辐射玻璃。这一成果证明了该材料具有出色的遮阳和隔热性能。本文所展示的研究不仅开创了一种用于设计具有可调热致透光率的智能材料的宝贵方法，而且还掌握了在一系列应用中提高能源效率的关键。这项创新对可持续建筑材料领域的潜在影响意义深远，有望在节能和环境管理方面取得重大进展。
