State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles , Donghua University , Shanghai 201620 , China.
Innovation Center for Textile Science and Technology , Donghua University , Shanghai 200051 , China.
ACS Appl Mater Interfaces. 2019 Sep 25;11(38):35333-35342. doi: 10.1021/acsami.9b12444. Epub 2019 Sep 16.
Low-density 3D ultrafine fiber assemblies obtained from direct electrospinning enable promising applications in sound absorption fields but are often hindered by their poor structure stability. Here, we demonstrate an electrospun ultrafine fiber sponge with a microstructure-derived reversible elasticity and high sound absorption property, which is achieved by designing a hierarchical lamellar corrugated architecture that functioned as elastic units. The obtained electrospun fiber sponge can quickly recover to the original height even under the distortion from burdens 8900 times its weight. Particularly, the material can maintain its structural stability after 100 cycles at 60% strain. Moreover, the initial hierarchical structure and hydrophobicity of the prepared materials endow them with an ultralight property (density of 6.63 mg cm), superior low-frequency sound absorption, and excellent performance maintenance. The successful synthesis of these fascinating materials may provide new insights into the design of lightweight and efficient sound absorption materials.
从直接静电纺丝获得的低密度 3D 超细纤维组件在吸声领域具有广阔的应用前景，但由于其结构稳定性差而受到限制。在这里，我们展示了一种具有微观结构衍生的可逆弹性和高吸声性能的静电纺超细纤维海绵，通过设计分层片状波纹结构作为弹性单元来实现。所得到的静电纺纤维海绵即使在承受 8900 倍自重的变形下，也能迅速恢复到原始高度。特别地，该材料在 60%应变下经过 100 个循环后仍能保持其结构稳定性。此外，所制备材料的初始分层结构和疏水性赋予了其超轻特性（密度为 6.63mg/cm）、优越的低频吸声性能和优异的性能保持性。这些引人注目的材料的成功合成可能为设计轻质高效吸声材料提供新的思路。
