Kraft Lignin Periodate Oxidation for Biobased Wood Panel Resins
Kraft Lignin Periodate Oxidation for Biobased Wood Panel Resins
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DOI：
10.1021/acsapm.3c00324
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发表时间：
2023-05
影响因子：
5
通讯作者：
Archana Bansode;Lorena Alexandra Portilla Villarreal;Yuyang Wang;O. Asafu-Adjaye;B. Via;R. Farag;I. B. Vega Erramuspe;M. L. Auad
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文献类型：
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作者：
Archana Bansode;Lorena Alexandra Portilla Villarreal;Yuyang Wang;O. Asafu-Adjaye;B. Via;R. Farag;I. B. Vega Erramuspe;M. L. Auad
具有高粘接性能的生物基树脂的开发在木材工业中得到了相当大的关注。在这项研究中，我们开发了生物基酚醛清漆酚醛（BNPF）树脂部分取代石油基苯酚和甲醛与木质素来自硫酸盐生物炼制和改性硫酸盐生物炼制衍生的木质素，分别。我们首先通过高碘酸盐氧化过程对木质素进行温和而有效的化学改性。高碘酸钠用于氧化木质素结构中单元间键（β-O-4键）中存在的羟基官能团，并将木质素部分转化为醌。这通过傅里叶变换红外光谱、元素分析、固态1H-13 C 2D HETCOR NMR和醛含量分析来评估。我们先用木质素取代苯酚，再用氧化木质素取代甲醛，最后用木质素和氧化木质素同时取代苯酚和甲醛，合成了一系列BNPF树脂。NPF树脂的结构表征结果表明，在酚环中形成了亚甲基键。在作为木材胶粘剂应用之前，我们通过差示扫描量热法研究了配制的胶粘剂的固化行为。使用拉伸剪切强度分析确定粘合剂的粘合强度。粘接性能测试表明，BNPF树脂胶粘剂具有较高的粘接强度（> 0.7MPa）。本研究的结果为利用天然高分子如木质素合成生物基木材胶粘剂提供了一个有前途的前景。
The development of biobased resins with high-bonding performance has gained considerable attention in the wood industry. In this study, we developed biobased novolacs phenol-formaldehyde (BNPF) resins by partially replacing petroleum-based phenol and formaldehyde with lignin derived from kraft biorefinery and modified kraft biorefinery-derived lignin, respectively. We first performed a mild and efficient chemical modification of the lignin through the periodate oxidation process. Sodium periodate was used to oxidize the hydroxyl functional groups present in the interunit linkages (β-O-4 bond) in the lignin structure and convert lignin partly to quinones. This was assessed by Fourier-transform infrared spectroscopy, elemental analysis, solid-state1H–13C 2D HETCOR NMR, and aldehyde content analysis. We synthesized a series of BNPF resins by replacing phenol with lignin, then by replacing formaldehyde with oxidized lignin, and finally by replacing both phenol and formaldehyde with lignin and oxidized lignin. The structural characterization results of the NPF resins revealed the formation of methylene linkages in the phenolic rings. Before application as wood adhesives, we studied the curing behavior of the formulated adhesive via differential scanning calorimetry. The adhesion strength of the adhesive was determined using the tensile shear strength analysis. The bonding performance tests indicated that BNPF resin adhesives have high adhesion strengths (>0.7 MPa). The outcome of this research provides a promising perspective to utilize natural polymers such as lignin for the synthesis of biobased wood adhesives.