"Graft to" Modification of Lignin by the Combination of Enzyme-Initiated Reversible Addition-Fragmentation Chain Transfer and Grafting
"Graft to" Modification of Lignin by the Combination of Enzyme-Initiated Reversible Addition-Fragmentation Chain Transfer and Grafting
复制标题
酶引发可逆加成-断裂链转移与接枝相结合对木质素进行“接枝”改性
DOI：
10.1021/acssuschemeng.9b02028
复制
发表时间：
2019-08-05
影响因子：
8.4
通讯作者：
Yuan, Jiugang
中科院分区：
文献类型：
--
作者：
Bao, Xueming;Yu, Yuanyuan;Yuan, Jiugang
可逆加成-断裂链转移(RAFT)聚合在制备重量和结构可控的聚合物方面显示了良好的前景。本研究采用“一酶双催化法”对木质素进行RAFT聚合和接枝改性。利用辣根过氧化物酶(HRP)和过氧化氢(H_2O_2)产生乙酰丙酮(Acac)自由基，在链转移剂的存在下有效地引发可控RAFT聚合。在这项研究中，两个乙烯基单体聚合，提供了可控的相对分子质量和低分子量分布的聚合物。此外，在HRP/H_2O_2/ACAC体系的催化下，将这种新的“接枝-RAFT”聚合方法应用于木质素制备生物复合材料。通过傅里叶变换红外光谱等分析测试，考察了接枝生物复合材料与原木质素的差异。HRP引发的RAFT聚合和酶催化的接枝改性的成功结合，将为不同单体的绿色聚合和功能材料的绿色制备开辟一条新的途径。
Reversible addition-fragmentation chain-transfer (RAFT) polymerization demonstrates promise for preparing polymers with well-controlled weights and architectures. In this study, "one enzyme double catalysis" method applied in RAFT polymerization and grafting for lignin modification was reported. Acetylacetone (ACAC) radicals were generated by horseradish peroxidase (HRP) and hydrogen peroxide (H2O2), efficiently initiating well-controlled RAFT polymerization in the presence of chain-transfer agents. In this study, two vinyl monomers were polymerized, affording polymers with a controlled molecular weight and a low-molecular-weight distribution. In addition, this new "graft to" RAFT polymerization method catalyzed by the HRP/H2O2/ACAC system was carried out on lignin to prepare biocomposites. The difference between the grafted biocomposites and raw lignin was examined by Fourier transform infrared spectroscopy, and other analysis tests. The successful combination of HRP-initiated RAFT polymerization and enzyme-catalyzed graft modification will open a new avenue for the potential green polymerization of different monomers and green preparation of functional materials.