The use of biomass as a binder for the development of high-performance wood products has become a popular research topic in the context of sustainable development. In this work, wood flour obtained from agroforestry processing residues was used as an active functional filler. The wood flour was oxidized and chemically cross-linked with hyperbranched polyamines and used as a binder matrix. By applying the same oxidative treatment to the wood surface, a chemically activated bonding interface was formed. Analysis by FTIR, C NMR, XPS and XRD characterization showed that the key to the improved bonding property was the formation of multiple covalent cross-linked networks during hot pressing of the plywood. It is clear that the specimens with untreated wood surfaces showed no water resistance and the dry strength was only above the standard value. On the contrary, after activation of the veneer surfaces, the bond strength and water resistance were significantly improved, meeting the requirements of GB/T 17657–2013 for Class I panels. Activation of the chemically active adhesive interface by oxidation of wood materials is an effective means of improving the performance of plywood, and also provides a new idea for high-value utilization of biomass resources.

中文翻译：

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活性木粉作为粘合剂，用于粘合活性木单板，以生产可持续的木质复合材料

利用生物质作为粘合剂开发高性能木制品已成为可持续发展背景下的热门研究课题。在这项工作中，从农林业加工残留物中获得的木粉被用作活性功能填料。木粉经过氧化并与超支化多胺进行化学交联，并用作粘合剂基质。通过对木材表面进行相同的氧化处理，形成化学活化的粘合界面。FTIR、13C NMR、XPS和XRD表征分析表明，胶合板热压过程中形成多个共价交联网络是提高粘合性能的关键。很明显，木材表面未经处理的样本没有表现出耐水性，并且干强度仅高于标准值。相反，单板表面经过活化后，其粘结强度和耐水性明显提高，满足GB/T 17657-2013对I类板材的要求。通过木质材料氧化活化化学活性胶界面是提高胶合板性能的有效手段，也为生物质资源的高值化利用提供了新思路。