Blazejczyk Aurelia
Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159 ST., 02-776 Warsaw, Poland.
Materials (Basel). 2018 Sep 13;11(9):1717. doi: 10.3390/ma11091717.
A detailed morphometric analysis of one-component polyurethane (PU) expanding foams, with densities of 26 and 28 kg/m³ ('SUMMER' and 'WINTER' product versions), was conducted to evaluate the topology of the foam cells and to discover processing-to-structure relationships. The microstructural analysis of the heterogeneously distributed pores revealed tight relationships between the foam morphology and the cell topology, depending on the growth rate and local environmental conditions, governed by the properties of the blowing gas used. The most significant morphometric output included the following: open/closed porosity and (heterogeneous) pore distribution, relative density and (homogeneous) strut distribution, and total solid matrix surface and closed pore surface area-at the macroscopic level of the foam. While, at the microscopic level of the cells, the results embraced the following: the size of every detected strut and pore, identified two-dimensional (2D) shapes of the cell faces, and proposed three-dimensional (3D) topologies modelling the PU foam cells. The foam microstructure could be then related with macroscopic features, significant in building applications. Our protocol outlines the common procedures that are currently used for the sample preparation, X-ray scanning, 3D image reconstruction and dataset analysis in the frame of the X-ray computed microtomography (µ-CT) testing of the one-component PU foams, followed by a statistical (multiple Gaussian) analysis and conceptual considerations of the results in comparison with thematic literature.
对密度分别为26和28 kg/m³的单组分聚氨酯（PU）膨胀泡沫（“夏季”和“冬季”产品版本）进行了详细的形态计量分析，以评估泡沫孔的拓扑结构并发现加工与结构之间的关系。对异质分布孔隙的微观结构分析表明，泡沫形态与孔拓扑之间存在紧密关系，这取决于生长速率和局部环境条件，而这些条件又受所用发泡气体性质的控制。最重要的形态计量结果包括：在泡沫宏观层面上的开孔/闭孔率和（非均匀）孔隙分布、相对密度和（均匀）支柱分布，以及总固体基质表面积和闭孔表面积。而在细胞微观层面上，结果包括：每个检测到的支柱和孔隙的尺寸、确定的细胞面二维（2D）形状，以及提出的对PU泡沫细胞进行建模的三维（3D）拓扑结构。然后可以将泡沫微观结构与建筑应用中重要的宏观特征联系起来。我们的方案概述了当前用于单组分PU泡沫的X射线计算机断层扫描（µ-CT）测试框架下的样品制备、X射线扫描、3D图像重建和数据集分析的常见程序，随后进行统计（多重高斯）分析以及与主题文献相比对结果的概念性考量。
