Innovation Center for Textile Science and Technology, College of Textiles, Donghua University, Shanghai 201620, China.
Nano Lett. 2022 Jan 26;22(2):830-837. doi: 10.1021/acs.nanolett.1c04571. Epub 2022 Jan 10.
Nanofibrous sponges enable promising potentials in warmth retention but are impeded by short service life and nonwashability, owing to their inadequate mechanical properties. Herein, a scalable strategy is reported to develop ultralight, superelastic, and washable micro/nanofibrous sponges (MNFSs) with a rigid-flexible coupling architecture created by bridging high-modulus polyethylene terephthalate microfibers with flexible polyacrylonitrile nanofibers via robust bonding structures. Meanwhile, the doping of fluoropolymer endows micro/nanofibers with desirable amphiphobicity. The resultant MNFSs present high resilience, superior compressive fatigue resistance (5.7% residual strain at 1000th), low-temperature-resistant superelasticity (up to -196 °C), and unique washing-invariant superelasticity. Moreover, the fascinating structures of high porosity, high tortuosity, and small pores enable MNFSs both ultralight property (7.5 mg cm) and effective warmth retention (28.51 mW m K). Additionally, the MNFSs possess remarkable antifouling, robust stability, and long service life. The work might provide an avenue to develop mechanically robust nanofibrous sponges for various applications.
纳米纤维海绵在保暖方面具有很大的潜力,但由于其机械性能不足,存在使用寿命短和不耐洗的问题。本文报道了一种可扩展的策略,用于开发超轻、超弹和可洗的微/纳米纤维海绵(MNFSs),其具有刚性-柔性耦合结构,通过强结合结构将高模量的聚对苯二甲酸乙二醇酯微纤维与柔性聚丙烯腈纳米纤维桥接。同时,氟聚合物的掺杂赋予微/纳米纤维理想的疏水疏油性。所得的 MNFSs 具有高弹性、优异的抗压缩疲劳性(在第 1000 次时残余应变 5.7%)、耐低温超弹性(可达-196°C)和独特的可洗不变超弹性。此外,高孔隙率、高曲折度和小孔径的迷人结构使 MNFSs 具有超轻的特性(7.5mg cm)和有效的保暖性能(28.51 mW m K)。此外,MNFSs 还具有出色的抗污性、强稳定性和长使用寿命。这项工作可能为各种应用提供了开发机械坚固的纳米纤维海绵的途径。