Abstract A better understanding of the pyrolytic characteristics of pre-oxidized lignin in which C α H–OH was oxidized to C α O group was obtained through four selected β-ether-type lignin-like model polymers containing the H- and G-type subunits. These models were depolymerized in closed ampoule reactor system and interrogated using in-situ FTIR. The results show that their degradation products differ significantly in species and yield due to C α H–OH, C α O, and aryl–OCH 3 . The yield of phenolic monomers from oxidized G-type polymer rose to 27.87 wt%, almost twice that of initial G-type polymer. Nevertheless, as for H-type polymer, oxidation of the C α H–OH to C α O group lead to decreases in phenolic monomers yield by ~half. The in-situ FTIR indicates that oxidation of the C α H–OH to C α O accelerates cleavage of interunit linkages and simplifies depolymerization pathways resulting in better selectivity of phenolic monomers, especially at low pyrolysis temperatures (

中文翻译：

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使用四种代表性 β-醚型木质素样模型聚合物模拟预氧化木质素的热解行为

摘要 通过四种选定的含有 H 型和 G 型的 β-醚型木质素类模型聚合物，更好地了解了预氧化木质素的热解特性，其中 C α H-OH 被氧化为 C α O 基团。亚基。这些模型在封闭的安瓿反应器系统中解聚并使用原位 FTIR 进行询问。结果表明，由于 C α H-OH、C α O 和芳基-OCH 3 的存在，它们的降解产物在种类和产量上存在显着差异。从氧化的 G 型聚合物中酚类单体的产率上升到 27.87 wt%，几乎是初始 G 型聚合物的两倍。然而，对于 H 型聚合物，C α H-OH 氧化为 C α O 基团导致酚类单体产率降低约一半。