Laboratoire Innovation Matériau Bois Habitat (LIMBHA), Ecole supérieure du bois, 7 Rue Christian Pauc, 44306 Nantes, France.
Center Research for Natural Resources Conservation, University of Science, Ho Chi Minh City, Viet Nam; Vietnam National University, Ho Chi Minh City 700000, Viet Nam.
Int J Biol Macromol. 2022 Nov 30;221:16-24. doi: 10.1016/j.ijbiomac.2022.08.204. Epub 2022 Sep 5.
In the context of novel environmental and energy regulations in construction (RE2020), biocomposites derived from bamboo fibers, bamboo powders, and biodegradable poly(lactic)acid polymer, all of which are renewable resources, have been investigated to meet the criteria of the novel regulations. In this work, the biocomposites were manufactured by twin-screw internal mixing at 170 °C for 5 min with a rotation speed of 60 rpm. The composites sheets were then shaped on a hydraulic press at 185 °C. Pore characterization including pore volume fraction, 3D-pore structure and morphology, and pore distribution of these materials were investigated using X-ray tomography combined with image processing (Avizo). The results show that when the bamboo fibers content is increased, an augmentation in the pore volume fraction and the number of large-volume pores could be observed. In turn, the bamboo powder-containing sheet had a significant increase in pore volume fraction, while a higher quantity of smaller pores, with uniform size, could be observed. The water absorption capacity of these composite increases with the increase of the amount of pore distribution, pore connection, and pore volume fraction. In addition, the orientation of the fibers in 3D observation, flexural mechanical properties, and thermal stability of the biocomposites are also reported in this study.
在建筑环境和能源新型法规（RE2020）的背景下，研究了源自竹纤维、竹粉和可生物降解聚（乳酸）聚合物的生物复合材料，这些都是可再生资源，以满足新型法规的标准。在这项工作中，通过在 170°C 下以 60rpm 的转速双螺杆内部混合 5 分钟来制造复合材料。然后在 185°C 的液压机上成型复合材料片。使用 X 射线断层扫描结合图像处理（Avizo）研究了这些材料的孔隙特征，包括孔隙体积分数、3D 孔隙结构和形态以及孔隙分布。结果表明，随着竹纤维含量的增加，可以观察到孔隙体积分数和大体积孔隙数量的增加。相反，含有竹粉的片材的孔隙体积分数显著增加，同时可以观察到更多数量的尺寸均匀的较小孔隙。这些复合材料的吸水率随孔隙分布、孔隙连接和孔隙体积分数的增加而增加。此外，还报告了这些生物复合材料的纤维在 3D 观察中的取向、弯曲力学性能和热稳定性。
