Pinilla-Peñalver Esther, Del Fresno Óscar, Cantero Darío, Moreira Adriana, Gomes Filipa, Miranda Francisca, Oliveira Marcelo, Ornelas Mariana, Sánchez-Silva Luz, Romero Amaya
Department of Chemical Engineering, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain.
CeNTI-Centre for Nanotechnology and Smart Materials, Rua Fernando Mesquita 2785, 4760-034 V. N. Famalicão, Portugal.
Gels. 2024 Jul 16;10(7):465. doi: 10.3390/gels10070465.
In this work, polyurethane (PUR) aerogels doped with different SiO particles, derived from a renewable source, were successfully synthesized, and the effects of SiO content on the properties of PUR aerogels were investigated. Specifically, three types of SiO-based particles obtained from rice husk through different procedures were evaluated to enhance the thermal stability of the composites with special attention given to flame-retardant properties. With the optimal SiO particles, obtained through acid digestion, the influence of their content between 0.5 and 3 wt.% on the physicochemical characteristics of the synthesized aerogels was thoroughly examined. The results showed that increasing the doping agent content improved the lightness, thermal stability, and flame-retardant properties of the resulting PUR aerogels, with the best performance observed at a 2 wt.% doping level. The doped aerogel samples with non-modified SiO particles significantly enhanced the fire safety performance of the material, exhibiting up to an eightfold increase in flame retardancy. However, modification of the SiO particles with phytic acid did not slow down the combustion velocity when filling the aerogels. This research highlights the promising potential of doped PUR/SiO aerogels in advancing materials science and engineering applications for withstanding high temperatures and improving fire safety.
在这项工作中，成功合成了由可再生资源衍生的掺杂不同二氧化硅（SiO）颗粒的聚氨酯（PUR）气凝胶，并研究了SiO含量对PUR气凝胶性能的影响。具体而言，评估了通过不同程序从稻壳中获得的三种类型的SiO基颗粒，以提高复合材料的热稳定性，并特别关注其阻燃性能。使用通过酸消化获得的最佳SiO颗粒，深入研究了其含量在0.5至3 wt.%之间对合成气凝胶物理化学特性的影响。结果表明，增加掺杂剂含量可改善所得PUR气凝胶的亮度、热稳定性和阻燃性能，在2 wt.%的掺杂水平下观察到最佳性能。具有未改性SiO颗粒的掺杂气凝胶样品显著提高了材料的消防安全性能，阻燃性提高了八倍。然而，用植酸对SiO颗粒进行改性在填充气凝胶时并没有降低燃烧速度。这项研究突出了掺杂的PUR/SiO气凝胶在推进材料科学与工程应用以承受高温和提高消防安全方面的巨大潜力。
