Graft modification of lignin-based cellulose via enzyme-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization and free-radical coupling
Graft modification of lignin-based cellulose via enzyme-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization and free-radical coupling
复制标题
通过酶引发的可逆加成断裂链转移 (RAFT) 聚合和自由基偶联对木质素纤维素进行接枝改性
DOI：
10.1016/j.ijbiomac.2019.12.078
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发表时间：
2020
影响因子：
8.2
通讯作者：
Yuan Jiugang
中科院分区：
文献类型：
--
作者：
Bao Xueming;Fan Xuerong;Yu Yuanyuan;Wang Qiang;Wang Ping;Yuan Jiugang
本研究采用酶引发的可逆加成-断裂链转移(RAFT)聚合和自由基偶联相结合的绿色方法对典型的木质纤维素黄麻纤维进行改性。黄麻纤维表面覆盖着丰富的木质素，这为进一步功能化改性提供了很大的机会。在辣根过氧化物酶(HRP)引发的RAFT作用下，乙烯基单体丙烯酰胺(AM)或丙烯酸丁酯(BA)进行了可控聚合，形成了具有良好控制分子量和结构的规整聚合物。酶促接枝反应发生在黄麻上的木质素和聚合物的自由基之间。凝胶渗透色谱(GPC)分析表明，HRP引发RAFT聚合制备的聚合物的烷基链长得到了很好的控制。荧光红外光谱(FTIR)和X-射线光电子能谱(XPS)分析表明，酶催化合成的烷基链在黄麻表面接枝到了木质素表面。本研究通过HRP两种不同的催化作用，探索了一种木质素基材料具有可控接枝链结构的新型环保改性方法。
In this study, a green approach combining enzyme-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization and free-radical coupling was developed for the modification of jute fiber, which is a typical lignin-based cellulose. Jute fiber surface was covered by rich amount of lignin, which offered great opportunities for further functional modification. The controlled polymerization of vinyl monomers, acrylamide (AM) or butyl acrylate (BA), was carried out by horseradish peroxidase (HRP)-initiated RAFT to form well-defined polymers with well-controlled molecular weights and structures. Enzymatic grafting by HRP occurred between the free radicals of well-defined polymers and free radicals of lignin on jute. Gel permeation chromatography (GPC) analysis indicated the alkyl chain length of polymers prepared via HRP-initiated RAFT polymerization was well-controlled. Other results of flourier transformed infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed that well-controlled alkyl chains prepared via enzymatic catalysis were grafted on the exposed lignin of jute. The study explores a new and eco-friendly modification method for lignin-based materials with the controlled graft chain structure via two different catalysis with HRP.