Imitating Spiders to catch flying insects: Realizing high-strength bonding of bamboo scraps/magnesium oxychloride lightweight composite interface

Abstract

Compatible interface is the key to designing low-carbon building materials containing plant fiber. Moisture migration causes steric hindrance at interfaces, resulting in materials with poor two-phase interface compatibility and low mechanical strength. Drop load presents a serious threat to the structural safety of future houses. Firmer cementation in composite becomes an urgent problem. We report on a strategy using polysaccharide chains between two different phases, and design high-strength adhesion interface. This new design is inspired by the behavior of spiders to catch flying insects. The presence of hydroxyl and amino groups on the spider silk surface allows binding of flying insects with high strength and using only small contact area. To mimic that strategy, MgO was used for orderly crystallization on the polymer chain and active hydroxyl groups with high specific surface area achieves multidimensional and multi-site adhesion of bamboo scraps. Improved interfacial compatibility facilitates the formation of heterogeneous but continuous phase structure. The compressive stress reaches 4.66 MPa and softening factor is 0.74 for density of 0.37. The designed material is an advanced composite in construction and decoration. Its low-loading characteristic can reduce carbon footprint calculations, suggesting this strategy has significant potential for future development.