木质素作为含木质素的纤维素纳米原纤维中的关键组分，用于增强聚合物二苯甲烷二异氰酸酯木材胶粘剂的性能,ACS Sustainable Chemistry & Engineering

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木质素作为含木质素的纤维素纳米原纤维中的关键组分，用于增强聚合物二苯甲烷二异氰酸酯木材胶粘剂的性能
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2020-11-06 , DOI: 10.1021/acssuschemeng.0c05642
Heyu Chen _{1,

2} , Pitchaimari Gnanasekar ₂ , Sandeep S. Nair ₂ , Wenbiao Xu ₁ , Prashant Chauhan ₂ , Ning Yan _{1,

2}

Affiliation

含木质素的纤维素纳米原纤维（LCNF）是一种新兴的基于自然界的纳米材料，已成功应用于许多商业聚合物系统中，以增强其性能和功能性能。特别是，LCNFs在聚合的二苯基甲烷二异氰酸酯（pMDI）木材胶粘剂中用作功能性化合物，可显着增强粘合性能。为了阐明LCNF中木质素与pMDI木材胶粘剂之间相互作用的机制，¹³ C– ¹对溶解的球磨LCNF进行了H HSQC 2D-NMR实验，以揭示木质素和LCNF中多糖的分子结构特征，并鉴定了这些生物分子中可能与pMDI模型化合物反应的羟基。此外，通过亚氯酸盐处理制备不含木质素的CNF作为对照组，以说明木质素组分在影响所得粘合剂中的作用。发现木质素是LCNFs中不可或缺的组成部分，如固化动力学所示，反应活性提高，TGA显示，热稳定性提高，搭接剪切测试显示与非极性试剂的相容性更高。

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Lignin as a Key Component in Lignin-Containing Cellulose Nanofibrils for Enhancing the Performance of Polymeric Diphenylmethane Diisocyanate Wood Adhesives

Lignin-containing cellulose nanofibrils (LCNFs), an emerging family of nature-based nanomaterials, have been successfully applied in many commercial polymer systems to enhance their properties and functional performance. In particular, LCNFs were used in polymeric diphenylmethane diisocyanate (pMDI) wood adhesives as a functional compound to significantly reinforce bonding properties. In order to elucidate the mechanisms for the interactions between lignin in LCNFs and pMDI wood adhesive, ¹³C–¹H HSQC 2D-NMR experiments were carried out on dissolved ball-milled LCNFs to reveal the molecular–structural characteristics of lignin and polysaccharides in LCNFs and identify hydroxyl groups contained in these biomolecules that can be involved in reactions with the pMDI model compound. Moreover, a lignin-free CNF was prepared by chlorite treatment as a control group to illustrate the role of the lignin component in affecting the resulting adhesives. It was found that lignin was the integral component in LCNFs that is responsible for the increased reactivity as shown by curing kinetics, the improved thermal stability as shown by TGA, and the higher compatibility with nonpolar reagents as shown by lap-shear tests. The fundamental knowledge gained from this study allowed us to better understand the function of the lignin component as a distinctive feature of LCNFs, and insights into the role of lignin in improving pMDI wood adhesive performance would be highly beneficial for applying LCNFs as a novel sustainable nano-bio-reinforcing agent for a wider range of polymeric systems.

更新日期：2020-11-23

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