Chemical Modification of Plasticized Lignins Using Reactive Extrusion
Chemical Modification of Plasticized Lignins Using Reactive Extrusion
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DOI：
10.3389/fchem.2019.00633
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发表时间：
2019-09
影响因子：
5.5
通讯作者：
Romain Milotskyi;L. Szabó;Kenji Takahashi;C. Bliard
中科院分区：
文献类型：
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作者：
Romain Milotskyi;L. Szabó;Kenji Takahashi;C. Bliard
研究了塑化硫酸盐木质素（KL）与马来酸酐和琥珀酸酐的酯化反应。发现DMSO、乙二醇和甘油是木质素的有效增塑剂。利用固体13 C CP-MAS NMR和FT-IR分析确定了这些新的木质素酯的化学结构。31 P NMR分析表明，在反应挤出反应条件下，木质素的脂肪族羟基具有上级反应活性。通过HSQC NMR光谱证实单酯的形成。使用GPC/SEC色谱法研究挤出过程后的分子量变化。通过TGA分析评估这些聚合物的热性能。将结果与在经典分批条件下改性的木质素酯进行比较。这些结果表明，雷克斯可以作为一种新的快速，无溶剂，和连续的木质素价值的过程。
The reaction of esterification of plasticized Kraft lignin (KL) with succinic and maleic anhydrides using reactive extrusion (REX) was studied in detail. DMSO, glycol and glycerol were found to be efficient plasticizers for lignin. The chemical structure of these new lignin esters was determined using Solid-state 13C CP-MAS NMR and FT-IR analysis. 31P NMR analysis of phosphitylated lignins showed that the aliphatic OH groups of lignin had superior reactivity under the reactive extrusion reaction conditions. The formation of monoesters was confirmed by HSQC NMR spectroscopy. Molecular weight changes after extrusion process were studied using GPC/SEC chromatography. Thermal properties of these polymers were assessed by TGA analysis. The results were compared to lignin esters modified in classical batch conditions. These results show that REX can be used as a new fast, solvent free, and continuous process for lignin valorization.