Acosta Andrey, Aramburu Arthur B, Beltrame Rafael, Gatto Darci A, Amico Sandro, Labidi Jalel, Delucis Rafael de Avila
Post-Graduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91509-900, Brazil.
Post-Graduate Program in Materials Science and Engineering, Federal University of Pelotas, Pelotas 96010-610, Brazil.
Polymers (Basel). 2022 Dec 16;14(24):5510. doi: 10.3390/polym14245510.
The use of lignocellulosic fillers in rigid polyurethane foams (RPUFs) has been receiving great attention due to their good mechanical and insulation properties and the high sustainable appeal of the obtained cellular polymers, although high water uptakes are found in most of these systems. To mitigate this detrimental effect, RPUFs filled with wood flour (2.5% wt) were fabricated with the addition of furfuryl alcohol (FA) to create a polymer grafted with the wood filler. Two concentrations of FA (10 wt% and 15 wt%) were investigated in relation to the wood flour, and the RPUFs were characterized for cell morphology, density, compressive properties, thermal stability, and water uptake. The introduction of wood flour as a filler decreased the cell size and increased the anisotropy index of the RPUFs and, in addition to that, the FA grafting increased these effects even more. In general, there were no significant changes in both mechanical and thermal properties ascribed to the incorporation of the fillers. On the other hand, a reduction of up to 200% in water uptake was ascribed to the FA-treated fillers.
由于木质纤维素填料具有良好的机械性能和绝缘性能,以及所得泡沫聚合物具有较高的可持续吸引力,因此其在硬质聚氨酯泡沫(RPUF)中的应用受到了广泛关注,尽管在大多数此类体系中发现其吸水率较高。为减轻这种不利影响,通过添加糠醇(FA)制备了填充木粉(2.5%重量)的RPUF,以形成与木材填料接枝的聚合物。研究了相对于木粉的两种FA浓度(10重量%和15重量%),并对RPUF的泡孔形态、密度、压缩性能、热稳定性和吸水率进行了表征。引入木粉作为填料减小了RPUF的泡孔尺寸并增加了其各向异性指数,此外,FA接枝进一步增强了这些效果。总体而言,填料的加入对机械性能和热性能没有显著影响。另一方面,经FA处理的填料使吸水率降低了高达200%。