Cai Li, Zhang Xin, Li Yue, Li Hangyang, Liao Shusheng, Luo Jing, Song Pingan, Li Jianzhang, Gao Qiang, Chen Hui, Li Jingchao
State Key Laboratory of Efficient Production of Forest Resources & MOE Key Laboratory of Wood Material Science and Application, Beijing Forestry University, Beijing, 100083, China.
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
Small. 2025 Jun;21(24):e2502135. doi: 10.1002/smll.202502135. Epub 2025 Apr 25.
The development of multifunctional bio-adhesives that are electrically conductive, flame-retardant, and electromagnetic shielding is crucial for advancing next-generation wood-based composites. However, to date it remains a significant challenge to achieve such functionalities in adhesives while maintaining their strong adhesion. This study draws inspirations from the microstructure and properties of coral shells, and proposed a multiphase engineering to prepare a multifunctional soy protein isolate (SPI) adhesive (SPI/PA@G) by introducing a hierarchical polyaniline/phenylphosphonic acid aggregates-loaded graphene nanoplatelets (GNPs) hybrid. Because of the presence of polyaniline/phenylphosphonic acid aggregates, the designed SPI/PA@G adhesive exhibits remarkable flame retardancy with a high limiting oxygen index value of ≈39.4%. Because the GNPs in the adhesive form a highly conductive network on wood particles surfaces, as-prepared wood-based composite achieves an electrical conductivity as high as 43100 S m, and gives rise to an electromagnetic shielding effectiveness of 52.1 dB. In addition, multiple crosslinking interactions endow the SPI/PA@G adhesive with excellent bonding strength, as reflected by a high flexural strength of 19.7 MPa for the wood-based composite. This study offers a new approach to the design of multifunctional adhesives and their advanced wood-based composites, which holds great potential for real-world applications in creating advanced functional wooden products and beyond.
开发具有导电、阻燃和电磁屏蔽功能的多功能生物粘合剂对于推进下一代木质基复合材料至关重要。然而，迄今为止，在保持粘合剂强粘附力的同时实现这些功能仍然是一项重大挑战。本研究从珊瑚壳的微观结构和性能中获得灵感，提出了一种多相工程，通过引入负载分层聚苯胺/苯膦酸聚集体的石墨烯纳米片（GNPs）杂化物来制备多功能大豆分离蛋白（SPI）粘合剂（SPI/PA@G）。由于聚苯胺/苯膦酸聚集体的存在，所设计的SPI/PA@G粘合剂具有显著的阻燃性，极限氧指数值高达约39.4%。由于粘合剂中的GNPs在木材颗粒表面形成了高度导电的网络，所制备的木质基复合材料的电导率高达43100 S m，并产生了52.1 dB的电磁屏蔽效能。此外，多种交联相互作用赋予SPI/PA@G粘合剂优异的粘结强度，木质基复合材料的高弯曲强度为19.7 MPa就反映了这一点。本研究为多功能粘合剂及其先进木质基复合材料的设计提供了一种新方法，在制造先进功能木制品及其他领域的实际应用中具有巨大潜力。
