纳米纤维素增强豆胶胶合性能的热分析

Thermal Analysis on the Bond Strength of the Soybean Adhesive Improved by Nanocrystalline Cellulose

目的分析纳米纤维素（NCC）对豆胶热力学性能的影响,并验证纳米纤维素对豆胶宏观胶合性能的增强作用。方法运用差示扫描仪（DSC）和动态机械分析仪（DMA）分析纳米纤维素对豆胶胶合性能的增强,并对比空白组豆胶与质量分数为3%纳米纤维素的豆胶不同的胶合性能。结果 DSC曲线显示豆胶分子链的打开伴随着50-200℃吸热的协同转化。在豆胶的DMA曲线中,加入NCC,储能模量E′提高,耗散因子tanδ降低,说明NCC提高了豆胶胶合板抵抗变形的能力。结论胶合强度测试显示NCC的加入提高了杨木胶合板的胶合强度,NCC质量分数为3%的豆胶胶合板的胶合性能比空白胶合板的提高了56%。

This research analyzed the effect of nanocrystalline cellulose（NCC） on the thermodynamic property of soybean adhesive and verified the enhancement of the macro-bonding strength of soybean adhesive by NCC. The differential scanning calorimetry（DSC） and the apparatus of dynamic mechanical analysis（DMA） were applied to analyze the enhancement of the bonding strength of soybean adhesive by NCC and compare the bonding strength between blank soybean adhesives（the control group） and those added with NCC of 3% mass fraction. The DSC curves showed that the unfolding of soybean adhesive was a cooperative transformation accompanied with decalescence phenomenon in the range of 50-200℃. The DMA curve of soybean adhesive illustrated that the addition of NCC resulted in the increase of the storage modulus E′and the decrease of the dissipation factor tanδ, indicating that NCC improved the deformation resistance of soybean-adhesive plywood. And the test of bonding strength showed that the bond strength of poplar plywood was enhanced as NCC was added, and the bonding strength of samples added with 3% NCC was 56% higher than the control ones.