In this work, microcrystalline cellulose (MCC) and sawdust (SD) green fillers have been demonstrated as reactive fillers and moisture reservoirs for enhanced curing and adhesion strength of one-component moisture-curing polyurethane (PU) adhesives. The chemical reaction between the MCC or SD fillers and isocyanates present in the PU adhesives was tracked using Fourier-transform infrared spectroscopy (FTIR), while the joint strength was determined using lap-shear tests. The results showed that the addition of MCC or SD leads to an accelerated curing rate through the early consumption of isocyanates. The lap-shear strength of unreinforced PU adhesive joints was achieved in 12 hours. In turn, the curing time in MCC and SD reinforced joints was achieved in 5 hours. The addition of MCC and SD fillers also enhanced the lap-shear strength of the joints under full cure conditions. An autocatalytic growth model was used to describe the lap-shear strength variation with respect to curing time.

在这项工作中，微晶纤维素（MCC）和锯末（SD）绿色填料已被证明是用于增强单组分湿固化聚氨酯（PU）粘合剂的固化和粘合强度的反应性填料和水分储存剂。使用傅里叶变换红外光谱（FTIR）跟踪MCC或SD填料与PU粘合剂中存在的异氰酸酯之间的化学反应，同时使用搭接剪切试验确定接缝强度。结果表明，通过尽早消耗异氰酸酯，添加MCC或SD可以加快固化速度。未增强的PU胶粘接头的搭接剪切强度在12小时内达到。反过来，MCC和SD增强接头的固化时间达到了5小时。在完全固化条件下，MCC和SD填料的加入还增强了接头的搭接剪切强度。使用自动催化生长模型来描述搭接剪切强度相对于固化时间的变化。