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首页> 外文期刊>Holzforschung >Thermal stability of lignin in ground pulp (GP) and the effect of lignin modification on GP's thermal stability: TGA experiments with dimeric lignin model compounds and milled wood lignins
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Thermal stability of lignin in ground pulp (GP) and the effect of lignin modification on GP's thermal stability: TGA experiments with dimeric lignin model compounds and milled wood lignins

机译：地下纸浆中木质素的热稳定性（GP）及木质素改性对GP热稳定性的影响：二聚体木质素模型化合物的TGA实验和研磨木质木质素

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摘要

For ground pulp (GP) utilization in wood fiber composites as reinforced material, its thermal behavior is relevant. The contribution of lignin to thermal performance of GP from Pinus densiflora was the focus of the present study. Dimeric lignin model compounds and isolated milled wood lignins (MWLs) from three sources were submitted for thermogravimetric analysis (TGA). The temperatures leading to 1% weight loss (T per 1% WL) for the material were determined. The thermal stability of beta-O-4 models was the lowest. Among the MWLs, the abaca MWL with its high beta-O-4 content was the least thermostable. An acetylated nonphenolic beta-O-4 lignin model compound showed that acetylation improves the thermal stability of this type of dimeric models. The acetylation of benzylic OH groups in beta-O-4 linkages is especially relevant for the thermal resistance, which was also shown based on pre-acetylated benzylic OH groups in the GP before the total acetylation.
机译：对于地面纸浆（GP）利用木纤维复合材料作为增强材料，其热行为是相关的。木质素从Pinus densiflora的GP的热性能的贡献是本研究的重点。三种来源的二聚体木质素模型化合物和隔离的研磨木质木质素（MWLS）被提交用于热重分析（TGA）。确定导致材料的1％重量损失（每1％WL）的温度。 Beta-O-4型号的热稳定性是最低的。在MWL中，具有高β-O-4含量的ABACA MWL是最低的热稳定性。乙酰化非enolicβ-O-4木质素模型化合物表明，乙酰化改善了这种二聚体模型的热稳定性。 β-O-4键中的苄基OH基团的乙酰化对于热阻特别相关，其在总乙酰化之前基于GP中的预乙酰化苄基OH基团也示出。

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