文献类型：期刊文献

中文题名：木质素基RAFT链转移剂的合成及其聚合特性研究

英文题名：Synthesis and Characterization of Lignin Based Chain Transfer Agent Used for RAFT Polymerization

作者：王广彬[1,2,3,4] 陈家宝[1,2,3,4] 谷利敏[5] 王春鹏[1,2,3,4,6,7] 许玉芝[1,2,3,4,6,7]

第一作者：王广彬

机构：[1]中国林业科学研究院林产化学工业研究所;[2]生物质化学利用国家工程实验室;[3]国家林业局林产化学工程重点开放性实验室;[4]江苏省生物质能源与材料重点实验室;[5]河南省化工研究所有限责任公司;[6]中国林业科学研究院林业新技术研究所;[7]南京林业大学江苏省林业资源高效加工利用协同创新中心

年份：2018

卷号：38

期号：6

起止页码：75-80

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金资助项目(31770604)。

语种：中文

中文关键词：木质素;可逆加成裂解链转移聚合(RAFT);链转移剂;可控聚合

外文关键词：lignin;reversible addition-fragmentation chain transfer polymerization(RAFT);chain transfer agent;controlled polymerization

分类号：TQ35

摘要：采用一锅法,以木质素为原料,经二硫化碳、2-溴丁酸甲酯进行黄原酸酯功能化改性合成木质素基大分子链转移剂(lignin-CTA),通过FT-IR、~1H NMR、^(13)C NMR对其结构进行表征,并将其用于丙烯酰胺的RAFT聚合反应制备木质素-丙烯酰胺共聚物(lignin-g-PAM),考察该反应的聚合特征。木质素功能化改性前后的红外谱图显示:改性后羟基吸收峰明显减弱,并且在1148和1732 cm^(-1)处分别出现了—C=S键振动吸收峰和酯键的羰基吸收峰,说明2-溴丁酸甲酯已成功接枝到木质素大分子上;同时lignin-CTA的~1H NMR谱图中于δ0.90处出现了2-溴丁酸甲酯末端甲基的活泼氢质子峰,^(13)C NMR谱图中于δ162处出现了—C=S的碳原子峰,进一步印证了接枝反应的进行。丙烯酰胺的RAFT聚合反应结果显示:聚合物的相对分子质量与转化率基本呈现线性关系,同时其多分散系数较低且分布相对较窄(1.26～1.53),证明该聚合反应具有高效可控特性。
Lignin based chain transfer agent(lignin-CTA)was synthesized by one-pot reaction with using lignin,carbon disulfide and methyl 2-bromobutyrate as raw materials and was characterized by FT-IR,1^H NMR and 13^C NMR spectroscopy,respectively.Then this lignin-CTA was used for performing reversible addition-fragmentation chain transfer polymerization(RAFT)of acrylamide to prepare lignin-acrylamide copolymer(lignin-g-PAM).And the polymerization characteristics of the reaction was studied.In FT-IR spectra of lignin before and after functional modification,the intensity of peak corresponding to hydroxyl group decreased obviously after modification.In addition,the peak at 1148 cm^-1 corresponding to C S bond and the peak at 1732 cm^-1 corresponding to ester carbanyl groupappeared in the spectrum of lignin-CTA,which indicated that the methyl 2-bromobutyrate was successfully grafted on the lignin.The peak atδ0.90 in the 1^H NMR spectrum of lignin-CTA was corresponded to the protons of end methyl of methyl 2-bromobutyrate and the peak atδ162 in 13^C NMR spectrum of lignin-CTA was attrubuted to the carbon atom of-C S bond.These all proved that methyl 2-bromobutyrate was grafted on lignin successfully.In the RAFT polymerization of acrylamide,number-average molecular weight(M n)and PDI values vs conversions presented linear relationship and the polydispersity index was low and distributed in a narrow range,indicating that this polymerization process was highly efficient and well controlled.