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Transparent Polyisocyanurate-Polyurethane-Based Aerogels: Key Aspects on the Synthesis and Their Porous Structures
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-09-01 , DOI: 10.1021/acsapm.1c00712
Beatriz Merillas 1 , Judith Martín-de León 1 , Fernando Villafañe 1 , Miguel A. Rodríguez-Pérez 1
Affiliation  

The effect of the catalyst concentration on the synthesis and textural properties of polyisocyanurate-polyurethane aerogels is analyzed. The use of different catalyst amounts allows obtaining low-density aerogels (0.10–0.16 g/cm3) with high porosities (85–91%). Their porous structures were analyzed by scanning electron microscopy and nitrogen adsorption–desorption isotherm. A noticeable decrease in the size of the scattering centers, particles and pores, was achieved when reducing the catalyst amount. In some samples, the small size of these features, much smaller than the wavelength of visible light, causes a bare light dispersion, leading to the first transparent polyisocyanurate-polyurethane aerogels. Light transmittance measurements at 532 nm have been made showing high values (ca. 76% for 1 mm thick samples) for the formulations with the smallest particle and pore sizes. These aerogels presenting optical transparency have many potential applications such as solar collectors, glazing systems for insulating windows, and sensors, among others.

中文翻译:

透明聚异氰脲酸酯-聚氨酯基气凝胶:合成的关键方面及其多孔结构

分析了催化剂浓度对聚异氰脲酸酯-聚氨酯气凝胶的合成和结构性能的影响。使用不同的催化剂量可以获得低密度气凝胶 (0.10–0.16 g/cm 3) 具有高孔隙率 (85–91%)。通过扫描电子显微镜和氮吸附-解吸等温线分析了它们的多孔结构。当减少催化剂用量时,散射中心、颗粒和孔的尺寸显着减小。在一些样品中,这些特征的小尺寸,远小于可见光的波长,导致光散射,导致第一个透明的聚异氰脲酸酯 - 聚氨酯气凝胶。在 532 nm 处进行的透光率测量表明,对于具有最小颗粒和孔径的配方,具有很高的值(对于 1 mm 厚的样品,大约为 76%)。这些具有光学透明性的气凝胶具有许多潜在的应用,例如太阳能收集器、用于绝缘窗户的玻璃系统和传感器等。
更新日期:2021-09-10
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