High-performance bamboo composites based on the chemical bonding of active bamboo interface and chitosan

• Published in: International journal of biological macromolecules 2023-07, Vol.244, p.125345-125345, Article 125345
• Main Authors: Su, Hang, Du, Guanben, Ren, Xiangyu, Liu, Chang, Wu, Yingchen, Zhang, Huijun, Ni, Kelu, Yin, Chunyan, Yang, Hongxing, Ran, Xin, Li, Jun, Gao, Wei, Yang, Long
• Format: Article
• Language: English
• Subjects: Bamboo composite; Interface bonding; Water resistance
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2023.125345

Nowadays, green, clean, and efficient sustainable development has become the world's mainstream industrial development. However, the bamboo/wood industry is still in the status quo with high fossil resource dependence and significant greenhouse gas emissions. Herein, a low-carbon and green strategy to produce bamboo composites is developed. The bamboo interface was modified directionally to a bamboo carboxy/aldehyde interface by using a TEMPO/NaIO4 system, and then chemically cross-linked with chitosan to produce active bonding bamboo composite (ABBM). It was confirmed that the chemical bond cross-linking (CN, N-C-N, electrostatic interactions, hydrogen bonding) in the gluing region was helpful to obtain the excellent dry bonding strength (11.74 MPa), water resistance (5.44 MPa), and anti-aging properties (decreased by 20 %). This green production of ABBM solves the problem of poor water resistance and aging resistance of all-biomass-based chitosan adhesives. It can replace bamboo composites produced using fossil-based adhesives to meet the requirements of the construction, furniture, and packaging industries, changing the previous situation of composite materials requiring high temperature pressing and highly dependent on fossil-based adhesives. This provides a greener and cleaner production method for the bamboo industry, as well as more options for the global bamboo industry to achieve green and clean production goals. Schematic diagram for the design and development of active bonding bamboo composite (ABBM). [Display omitted] •A production strategy of low-carbon and clean bamboo composite was explored.•Successful construction of chemically bonding interfaces for bamboo composite•Production of a bamboo composite material hot-pressed at room temperature•Use of an all bio-based adhesive chitosan for bamboo composite