In this work, we developed a high-performance two-component epoxy adhesive from two biobased triple-functional and hexa-functional epoxy monomer from lignin-derived monomer eugenol, and a cellulose-derived furfuryl diamine for metal substrates. Through a tight cross-linked network and rich electronegative structure, the adhesives showed excellent adhesive performance to various metal substrates, especially for Fe. It demonstrated a high lap shear strength up to 19.8 MPa to Fe substrate, surpassing most reported epoxy adhesives. Moreover, these adhesives exhibited excellent long-term adhesion properties in high-temperature and acidic/base aqueous environments. It can maintain more than 95% of the adhesive strength to Fe substrate after soaking in different acid-base environments for 7 days, and achieved a maximum adhesion strength of 16.46 MPa to Fe substrates at 200 °C only 14.2% decrease when compared to that at room temperature. Molecular simulations revealed that these two adhesives could rapidly achieve dynamic equilibrium with Fe (110) surface in 15 and 22 ps which was much shorter than that to Cu and Al, suggesting a stronger binding energy between these adhesive and Fe surfaces and was consistent with the adhesion performance. This work widens the way for high-performance bio-based epoxy adhesives to be used in more demanding environments.
Qi Feng,Hao Liu,Chen Liu,Xiaoyang Zhang,Ke Huang,Xiaohui Liu,Hui Jiang,Xuemei Wang
Flexible substrates with metal deposition layers are widely used in the fabrication of wearable devices. However, metal deposition processes are often complex and unsatisfactory due to the multifaceted interplay between deposition conditions and substrate properties. Therefore, it is crucial to find a convenient and effective method to improve the bonding between flexible substrates and metal interfaces. In this study, a phase transition protein-induced gold mineralization strategy is proposed to enhance the metal-substate interactions by facilitating gold deposition onto flexible substrates adhered with phase transition proteins. The self-assembly and conformational adaptation of phase transition proteins (including lactalbumin, lysozyme, and bovine serum albumin) driven by disulfide bond cleavage, provide abundant binding sites and stabilize the structure, enabling the reliable mineralization of gold ions on flexible substrates. The resulting gold-modified flexible substrates maintain the inherent flexibility of the original materials while manifesting excellent surface-enhanced Raman scattering (SERS) properties, reproducibility, and mechanical durability, exhibiting compatibility with various substrates, which can be applied for the detection of methotrexate in urine with a wide range from 10 −8 to 10 −3 M. This research provides a biomimetic approach to optimize metal adhesion on flexible materials and contributes to the development of biocompatible and stable metal-coated flexible materials.
危险品化学品经营许可证（带存储）