双网络纳米交联策略，以提高生物基木材胶粘剂的整体机械和耐水粘合性能,ACS Sustainable Chemistry & Engineering

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双网络纳米交联策略，以提高生物基木材胶粘剂的整体机械和耐水粘合性能
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-29 , DOI: 10.1021/acssuschemeng.0c04913
Zhong Wang _{1,

2} , Haijiao Kang ₂ , Hongguang Liu ₂ , Shifeng Zhang ₂ , Changlei Xia ₃ , Zhongkai Wang ₁ , Jianzhang Li ₂

Affiliation

生物质衍生的蛋白质胶粘剂作为工业上基于甲醛的树脂的替代品已引起广泛关注。但是，对于生物基结构胶粘剂，耐水聚合物结构对于实现粘合和内聚行为非常必要。在这项工作中，成功设计并制备了一种由纳米交联剂（含醛和多巴胺，纤维素纳米纤维，OCNF-CA）组成的新型双网大豆基粘合剂，并且该交联剂的交联结构与性质之间的关系对胶粘剂进行了系统的研究。双交联结构大大促进了刚性蛋白质链网络的优先分离/断裂，因此显着提高了填料的分散性和能量耗散效率。达到了强韧的机械性能，³。得益于最佳网络中足够的游离邻苯二酚基团，量身定制的对水分不敏感的粘合界面，这种双网络粘合剂表现出高而稳定的粘合性能，这是由胶合胶合板的极限剪切应力决定的。这项工作提供了一种新颖的策略来设计混合交联网络，以制备人造板行业中的高性能环保粘合剂。

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Dual-Network Nanocross-linking Strategy to Improve Bulk Mechanical and Water-Resistant Adhesion Properties of Biobased Wood Adhesives

Biomass-derived protein adhesives have gained considerable attention as a replacement for formaldehyde-based resins in industry. However, for biobased structural adhesives, water-tolerance polymeric structures were highly necessary to realize adhesion and cohesion behaviors. In this work, a new dual-network soy-based adhesive consisting of nanocross-linkers (aldehyde- and dopamine-bearing, cellulose nanofibers, OCNF-CA) was successfully designed and prepared, and the cross-linking structure–property relationship of the adhesive was systematically studied. The double cross-linked structure considerably facilitated the preferential detachment/rupture of the rigid protein chain network, therefore significantly improving the filler dispersion and energy dissipation efficiency. Strong and tough mechanical performance was achieved, with a maximum tensile strength of 8.42 MPa and a toughness of 6.06 MJ/m³. Thanks to the tailored moisture-insensitive adhesion interface resulting from the sufficient free-catechol groups on the optimal network, this dual-network adhesive exhibited high and stable adhesion properties as determined by the ultimate shear stress for glued plywood. This work provides a novel strategy to design a hybrid cross-linking network for preparing high-performance environmentally friendly adhesives in wood-based panel industries.

更新日期：2020-11-09

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