Dobrzanski Elizabeth, Ferreira Elisa S, Tiwary Praphulla, Agrawal Prashant, Chen Richard, Cranston Emily D
Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Bioproducts Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Bioproducts Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Department of Wood Science, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil.
Carbohydr Polym. 2024 Jul 1;335:122077. doi: 10.1016/j.carbpol.2024.122077. Epub 2024 Mar 19.
Three size-fractionated samples of pine beetle-killed wood particles were used to prepare lightweight insulative foams. The foams were produced by foam-forming an aqueous slurry containing wood particles (125-1000 μm), a polymer binder, and surfactant, followed by oven drying. The effect of wood particle size on the aqueous foam stability, structure, and performance of insulative foams was investigated. While all aqueous foams were highly stable, aqueous foam stability increased with decreasing particle size. For dry foams, the cell size distribution was similar for all particle sizes as it was primarily controlled by the surfactant; differences occurred within the cell wall structure. A size-structure-property relationship was identified using x-ray micro-computed tomography where smaller particles produced lighter cell wall frameworks, leading to lower densities and decreased thermal conductivity and compressive strength. Larger particles produced denser cell wall frameworks that were more resistant to deformation, although all dry foams had sufficient mechanical properties for use as insulation panels. Thermal conductivity for all wood particle size-fractionated samples was <0.047 W m K making the foams similar to expanded polystyrene/polyurethane and supporting their use as thermal insulation in buildings.
使用三个不同粒径的松树甲虫蛀木颗粒样本制备轻质绝缘泡沫。这些泡沫是通过将含有木材颗粒（125 - 1000微米）、聚合物粘合剂和表面活性剂的水性浆料进行发泡，然后烘箱干燥而制成的。研究了木材颗粒尺寸对水性泡沫稳定性、结构以及绝缘泡沫性能的影响。虽然所有水性泡沫都具有高度稳定性，但水性泡沫稳定性随颗粒尺寸减小而增加。对于干泡沫，所有粒径的泡孔尺寸分布相似，因为它主要由表面活性剂控制；泡孔壁结构存在差异。使用X射线微计算机断层扫描确定了尺寸 - 结构 - 性能关系，其中较小的颗粒产生更轻的泡孔壁框架，导致密度更低、热导率和抗压强度降低。较大的颗粒产生更致密的泡孔壁框架，更耐变形，尽管所有干泡沫都具有足够的机械性能用作保温板。所有木材颗粒分级样本的热导率均<0.047 W m⁻¹ K，这使得这些泡沫类似于发泡聚苯乙烯/聚氨酯，并支持它们在建筑物中用作隔热材料。
