Yuan Wenbin, Essawy Hisham, Ding Qiaomei, Zhou Xiaojian, Chen Xinyi
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China.
Department of Polymers and Pigments, National Research Centre, Cairo 12622, Egypt.
Materials (Basel). 2023 Sep 24;16(19):6384. doi: 10.3390/ma16196384.
Four types of classical tannin-based foam samples were prepared via different methods in the current study with an attempt to find out the impact of each one on the physico-mechanical properties. The results of performed tests showed similarity to the general trend of related research, with typical negative relation between the foam density and mechanical strength. A critical point was found for each type of foam samples, for example, for tannin-formaldehyde foams (TFF), they were in the range of 85-95 kg/m, while for tannin-glutaraldehyde foams (TGF), mechanically-generated tannin foams (MTF) and steam-driven tannin furanic foams (STDF), they were about 52-62 kg/m, 53-63 kg/m, and 73-83 kg/m, respectively. This implies a significant change for density and mechanical strength, has been dig out by intensive experimental results and analysis. In addition, a non-liner relationship between density and pulverization ratio was obtained by fitting the curves obtained by the experiment results. Finally, visualization using scanning electron microscopy (SEM) together with evaluation of the compression strength presented a deeper insight to illustrate the different factors affecting foam density and pulverization ratio.
在本研究中，通过不同方法制备了四种类型的经典单宁基泡沫样品，试图找出每种样品对物理机械性能的影响。所进行测试的结果显示出与相关研究的总体趋势相似，即泡沫密度与机械强度之间存在典型的负相关关系。发现每种类型的泡沫样品都有一个临界点，例如，对于单宁-甲醛泡沫（TFF），它们在85-95 kg/m的范围内，而对于单宁-戊二醛泡沫（TGF）、机械生成的单宁泡沫（MTF）和蒸汽驱动的单宁呋喃泡沫（STDF），它们分别约为52-62 kg/m、53-63 kg/m和73-83 kg/m。这意味着通过深入的实验结果和分析，已经发现了密度和机械强度的显著变化。此外，通过拟合实验结果得到的曲线，获得了密度与粉碎率之间的非线性关系。最后，使用扫描电子显微镜（SEM）进行可视化以及对压缩强度的评估，为说明影响泡沫密度和粉碎率的不同因素提供了更深入的见解。
