Bai Yannan, Liu Tongda, Zhang Xu, Li Hongshan, Li Jun, Ran Xin, Wang Ping, Du Guanben, Yang Long, Cao Mengnan
Yunnan Province Key Lab of Wood Adhesives and Glued Products, International Joint Research Center for Biomass Materials, School of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China; Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains, Ministry of Education, Southwest Forestry University, Kunming 650224, China.
Yunnan Province Key Lab of Wood Adhesives and Glued Products, International Joint Research Center for Biomass Materials, School of Materials and Chemical Engineering, Southwest Forestry University, Kunming 650224, China; Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains, Ministry of Education, Southwest Forestry University, Kunming 650224, China.
Int J Biol Macromol. 2025 Feb;289:138870. doi: 10.1016/j.ijbiomac.2024.138870. Epub 2024 Dec 17.
The wood industry's dependence on traditional petrochemical adhesives, which pose environmental and health risks, has spurred research into sustainable alternatives. Sustainable bio-based polysaccharide materials show promise due to their inherent adhesive properties, despite challenges related to mechanical weaknesses and water resistance. Inspired by the hardening mechanisms of nacre and arthropod cuticles, we have developed a novel biomimetic flame-retardant HPA/OCTS/VMT NSs-NH adhesive. This adhesive uses oxidized chitosan (OCTS) to crosslink with hyperbranched polymers (HPA) and surface-modified vermiculite nanosheets ((VMT NSs-NH), conferring flame retardancy. Furthermore, the interfacial compatibility between the VMT NSs-NH₂ nanomaterials and the adhesive is enhanced through the mediating action of HPA, thereby promoting the homogeneous dispersion of the adhesive. Through Schiff base chemistry-mediated covalent crosslinking, VMT NSs-NH integrates with OCTS, forming a microphase-separated structure similar to marine arthropod cuticles. This combination yields a wood bonding strength of 1.7 MPa, a limiting oxygen index of 36.7 %, and excellent cone calorimetry test results, providing an environmentally friendly adhesive solution for the wood industry.
木材工业对传统石化胶粘剂的依赖带来了环境和健康风险，这促使人们对可持续替代方案展开研究。可持续的生物基多糖材料因其固有的粘合性能而展现出前景，尽管存在与机械强度不足和耐水性相关的挑战。受珍珠层和节肢动物角质层硬化机制的启发，我们开发了一种新型的仿生阻燃HPA/OCTS/VMT NSs-NH胶粘剂。这种胶粘剂利用氧化壳聚糖（OCTS）与超支化聚合物（HPA）以及表面改性的蛭石纳米片（VMT NSs-NH）交联，赋予其阻燃性。此外，通过HPA的介导作用，VMT NSs-NH₂纳米材料与胶粘剂之间的界面相容性得到增强，从而促进了胶粘剂的均匀分散。通过席夫碱化学介导的共价交联，VMT NSs-NH与OCTS整合，形成了类似于海洋节肢动物角质层的微相分离结构。这种组合产生了1.7兆帕的木材粘结强度、36.7%的极限氧指数以及出色的锥形量热测试结果，为木材工业提供了一种环保的胶粘剂解决方案。
