Shuai Chen,Dennis W. Hess,Lianpeng Zhang,Xijuan Chai,Kaimeng Xu,Yulan Jian,Linkun Xie
Wood, a renewable and sustainable building material, suffers from poor durability in outdoor applications due to its hygroscopic nature. Current protective coatings often rely on energy-intensive processes or hazardous fluorinated chemicals, conflicting with the principles of green chemistry. Herein, we report a green strategy for fabricating self-healing superhydrophobic wood coatings that operate autonomously at room temperature. The coating is formed through a one-step co-condensation of octadecylamine (ODA) with methyltrimethoxysilane (MTMS) in ethanol, avoiding fluorinated compounds and external energy input for healing. The resulting surface exhibits a hierarchical micro/nano-structure, achieving an ultralow surface free energy (~6 mJ/m 2 ) and a water contact angle (WCA) exceeding 155°. After mechanical damage or severe plasma etching, superhydrophobicity is spontaneously restored within 36 h at ambient conditions. Notably, the MTMS/ODA coating demonstrates superior self-healing cyclability (43 cycles), exceptional UV stability (WCA > 140° after 936 h), and resistance to neutral/alkaline media. By significantly reducing water uptake and improving dimensional stability, this coating extends the service life of wood. This work presents a scalable, energy-efficient, and fluorine-free solution for protecting wood, aligning perfectly with the goals of sustainable construction and green materials engineering.
Dongxu Lu,Yanbing Li,Yake Chai,Ximei Wen,Liming Chen,Sanming Sun
HighlightsWhat are the main findings?A fluorine-free, silicone-based polyurethane (SiPU) can be used as the only raw material for fabricating membranes, addressing environmental and health concerns associated with fluorine-containing materials.The membranes are produced via a simple, one-step electrospinning process that overcomes the complexity of the conventional preparation method.What is the implication of the main finding?The optimized SiPU nanofiber membrane demonstrates excellent water repellency (hydrostatic pressure of 52 kPa) and breathability (water vapor transmission rate of 5798 g·m−2·d−1), meeting key performance criteria.The optimized SiPU-14 nanofiber membrane exhibits high mechanical strength (tensile strength of 6.15 MPa) and ductility (elongation at break of 98.80%), enhancing durability, comfort, and practical applicability in protective textiles.High-performance waterproof and breathable nanofiber membranes (WBNMs) are in great demand for various advanced applications. However, the fabrication of such membranes often relies on fluorinated materials or involves complex preparation processes, limiting their practical use. In this study, we present an innovative approach by utilizing silicon-containing polyurethane (SiPU) as a single-component, fluorine-free raw material to prepare high-performance WBNMs via a simple one-step electrospinning process. The electrospinning technique enables the formation of SiPU nanofibrous membranes with a small maximum pore size (dmax) and high porosity, while the intrinsic hydrophobicity of SiPU imparts excellent water-repellent characteristics to the membranes. As a result, the single-component SiPU WBNM exhibits superior waterproofness and breathability, with a hydrostatic pressure of 52 kPa and a water vapor transmission rate (WVTR) of 5798 g m−2d−1. Moreover, the optimized SiPU-14 WBNM demonstrates outstanding mechanical properties, including a tensile strength of 6.15 MPa and an elongation at break of 98.80%. These findings indicate that the single-component SiPU-14 WBNMs not only achieve excellent waterproof and breathable performance but also possess robust mechanical strength, thereby enhancing the comfort and expanding the potential applications of protective textiles, such as outdoor apparel and car seats.
危险品化学品经营许可证（带存储）