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首页> 外文期刊>RSC Advances >Characterization and phenolation of biorefinery technical lignins for lignin-phenol-formaldehyde resin adhesive synthesis
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Characterization and phenolation of biorefinery technical lignins for lignin-phenol-formaldehyde resin adhesive synthesis

机译：木质素-苯酚-甲醛树脂胶粘剂合成用生物精制技术木质素的表征和酚化

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摘要

Technical lignins are cheap, abundant and renewable phenolic substances that have been attracting increasing attention. In this study, the structural features and active sites of four technical lignins obtained from different biorefinery processes were thoroughly characterized. Their suitability for partial incorporation into a phenol-formaldehyde (PF) resin adhesive was also evaluated. Phenolation treatment under alkaline conditions was conducted to enhance the reactivity of the technical lignins. Composition analysis indicated that all four technical lignins had a high purity (>88%). C-13 nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) analyses revealed that the technical lignins from different original feedstocks and biorefinery processes had different structural features, but all of these technical lignins could be used in the synthesis of a lignin-phenolformaldehyde (LPF) resin adhesive. The structural features and active sites of the different technical lignins before and after phenolation treatment were determined using quantitative two-dimensional heteronuclear single-quantum correlation (2D HSQC) and P-31 NMR spectroscopies. The results confirmed that the phenolation treatment under alkaline conditions could effectively increase the number of active sites on the technical lignins and could be easily included in the synthesis process of LPF resin adhesives.
机译：工业木质素是廉价，丰富和可再生的酚类物质，受到越来越多的关注。在这项研究中，从不同的生物精炼过程中获得的四种技术木质素的结构特征和活性位点被彻底表征。还评估了它们对于部分掺入酚醛（PF）树脂粘合剂的适用性。在碱性条件下进行苯甲酸酯化处理以增强工业木质素的反应性。组成分析表明，所有四种工业木质素均具有高纯度（> 88％）。 C-13核磁共振（NMR）和凝胶渗透色谱（GPC）分析表明，来自不同原始原料和生物炼制工艺的工业木质素具有不同的结构特征，但所有这些工业木质素均可用于木质素的合成。酚醛（LPF）树脂粘合剂。使用定量二维异核单量子相关性（2D HSQC）和P-31 NMR光谱测定酚化处理前后不同技术木质素的结构特征和活性位点。结果证实，在碱性条件下的酚化处理可以有效地增加工业木质素上的活性位点的数目，并且可以容易地包括在LPF树脂粘合剂的合成过程中。

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