Poupart Romain, Lacour Thomas, Darnige Pablo, Poncelet Olivier, Aristégui Christophe, Voisin Thomas, Marre Samuel, Brunet Thomas, Mondain-Monval Olivier
Univ. Bordeaux, CNRS, UMR 5031, Centre de Recherche Paul Pascal F-33600 Pessac France
Univ. Bordeaux, CNRS, Bordeaux INP, Arts-et-Métiers, UMR 5295, Institut de Mécanique et d'Ingénierie F-33405 Talence France.
RSC Adv. 2020 Nov 17;10(68):41946-41953. doi: 10.1039/d0ra07269a. eCollection 2020 Nov 11.
A simple and easy way is proposed for the fabrication of a highly attenuating composite material for underwater acoustics. The approach involves the introduction of porous polymer beads into a polyurethane matrix. The porous beads are prepared through an emulsion-templating approach, and two different processes are used. The first one uses microfluidics to synthesize beads of controlled diameter and porosity. The control over the bead size allows the selection of the frequency range where the material exhibits the highest acoustic attenuation. The second one uses a double emulsion approach and allows for the production of much larger quantities of beads. Both approaches yield materials exhibiting much higher acoustic absorption than the one obtained using the most commonly used micro-balloon inclusion. We present both the synthesis procedures and the structural and acoustic characterizations of the beads and the final acoustic materials.
提出了一种简单易行的方法来制备用于水下声学的高衰减复合材料。该方法包括将多孔聚合物珠粒引入聚氨酯基体中。多孔珠粒通过乳液模板法制备，并使用了两种不同的工艺。第一种工艺使用微流体技术合成直径和孔隙率可控的珠粒。对珠粒尺寸的控制使得能够选择材料表现出最高声衰减的频率范围。第二种工艺使用双乳液法，能够生产大量的珠粒。两种方法制备的材料都比使用最常用的微球夹杂法得到的材料具有更高的吸声性能。我们展示了珠粒以及最终声学材料的合成过程、结构和声学表征。
