Marczyk Joanna, Przybek Agnieszka, Setlak Kinga, Bazan Patrycja, Łach Michał
Cracow University of Technology, Faculty of Materials Engineering and Physics, Warszawska 24, 31-155 Kraków, Poland.
ACS Omega. 2025 Jan 17;10(3):2488-2500. doi: 10.1021/acsomega.4c06227. eCollection 2025 Jan 28.
This study assessed the impact of the addition of phase change materials (PCMs) under the trade name Micronal 28S on the properties of the manufactured geopolymer foams. Micronal 28S is used as a functional component in foams (insulation materials), foamed building materials, and materials for temperature regulation to improve thermal comfort and indoor climate. The melting point of Micronal 28S is 28 ± 2 °C, and the heat of fusion is ∼140 J/g. As part of the research, geopolymer mixtures containing PCMs in the form of a slurry were prepared in shares of 0, 5, 10, and 15 wt %. Geopolymers were produced based on fly ash. The foaming process was carried out using hydrogen peroxide (HO). Physical, mechanical, and thermal properties and analysis of the microscopic microstructure were evaluated. The introduction of Micronal 28S into the geopolymer matrix is conducive to obtaining ultralight foams with a density of about 200 kg/m. As the share of the PCM increases, the thermal insulating properties of the samples increase by reaching a thermal conductivity coefficient λ of 0.057 W/mK. Simultaneously, the specific heat increases up to 1.105 kJ/kgK. Microstructure analysis confirmed that Micronal 28S tends to agglomerate and decrease pore size. The phase change material reduces the mechanical properties of the geopolymers. However, according to the EN 998-1 standard, the conditions for the requirements to be realized by insulating materials used in construction were met by a reference sample and one containing 5 wt % of Micronal 28S. The content in this publication addresses issues in both materials science and mechanical engineering. Although other authors have conducted research using various phase change materials, this work is the first to use PCMs with the trade name Micronal 28S to produce geopolymer foams with excellent thermal insulation properties.
本研究评估了添加商品名为Micronal 28S的相变材料（PCM）对所制备的地质聚合物泡沫材料性能的影响。Micronal 28S用作泡沫材料（隔热材料）、泡沫建筑材料和温度调节材料中的功能成分，以提高热舒适性和室内气候。Micronal 28S的熔点为28±2℃，熔化热约为140 J/g。作为研究的一部分，制备了含有0、5、10和15 wt%浆料形式PCM的地质聚合物混合物。地质聚合物基于粉煤灰制备。使用过氧化氢（HO）进行发泡过程。对物理、机械和热性能以及微观结构进行了评估。将Micronal 28S引入地质聚合物基体有利于获得密度约为200 kg/m的超轻泡沫。随着PCM份额的增加，样品的隔热性能提高，热导率系数λ达到0.057 W/mK。同时，比热容增加到1.105 kJ/kgK。微观结构分析证实，Micronal 28S倾向于团聚并减小孔径。相变材料降低了地质聚合物的机械性能。然而，根据EN 998-1标准，参考样品和含有5 wt% Micronal 28S的样品满足了建筑用隔热材料实现要求的条件。本出版物中的内容涉及材料科学和机械工程两个领域的问题。尽管其他作者使用各种相变材料进行了研究，但这项工作是首次使用商品名为Micronal 28S的PCM来生产具有优异隔热性能的地质聚合物泡沫。
