文献类型：期刊文献

中文题名：木质素基嵌段共聚物的合成、表征及压敏性研究

英文题名：Synthesis,Characterization and Pressure-sensitive of Lignin-based Block Copolymer

作者：李宁[1] 谷利敏[2] 高士帅[1] 刘婧伊[1] 张代晖[1] 许玉芝[1]

第一作者：李宁

机构：[1]中国林业科学研究院林产化学工业研究所,江苏省生物质能源与材料重点实验室,国家林业和草原局林产化学工程重点实验室,林木生物质低碳高效利用国家工程研究中心,江苏省林业资源高效加工利用协同创新中心,江苏南京210042;[2]河南省化工研究所有限责任公司,河南郑州450052

年份：2025

卷号：45

期号：1

起止页码：115-122

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：;北大核心:【北大核心2023】；

基金：国家自然科学基金资助项目(32201508)。

语种：中文

中文关键词：木质素;RAFT乳液聚合;嵌段共聚物;压敏性;豆粕胶黏剂

外文关键词：lignin;RAFT emulsion polymerization;block copolymer;pressure-sensitive performance;soybean meal adhesive

分类号：TQ35

摘要：以磺化木质素黄原酸酯(lignin-CTA)为链转移剂,与甲基丙烯酸甲酯(MMA)进行可逆加成-断裂链转移(RAFT)乳液聚合,并将得到的木质素-聚甲基丙烯酸甲酯(lignin-g-PMMA)接枝共聚物作为大分子链转移剂,然后加入甲基丙烯酸月桂酯(LMA)进行扩链反应,合成一种具有压敏性能的木质素基嵌段共聚物(lignin-g-PMMA-b-PLMA),并探究了其对豆粕胶黏剂初黏性的影响。红外光谱(FT-IR)、核磁共振氢谱(1H NMR)、凝胶渗透色谱(GPC)及差示扫描量热(DSC)分析结果均证实了LMA与lignin-g-PMMA反应形成了嵌段共聚物,所得lignin-g-PMMA-b-PLMA的红外光谱图在1729 cm^(-1)处有MMA中酯基的振动吸收峰,2922、2853 cm^(-1)处有—CH_(2)—吸收峰,1H NMR谱图中δ3.57处有PMMA中—OCH3的氢质子峰,δ4.04处有PLMA中—O—CH_(2)—的氢质子峰;相比lignin-g-PMMA,嵌段共聚物的相对分子质量显著增加,平均粒径有所增大,相对分子质量分布变宽(PDI为2.68),玻璃化转变温度(Tg)为-24℃,低于lignin-g-PMMA的114℃。“环形法”测试发现嵌段共聚物的最大拉力值为0.79 N,显示出一定压敏性,将其用于改性豆粕胶黏剂的饰面板贴面实验,lignin-g-PMMA-b-PLMA乳液的添加量为10%时,饰面板不会产生翘曲,说明改性后豆粕胶的初黏性有了较大的改善。
Sulfonated lignin xanthate(lignin-CTA)was used as a chain transfer agent for the reversible addition-fragmentation chain transfer(RAFT)emulsion polymerization of methyl methacrylate(MMA).The obtained lignin-g-PMMA graft copolymer was further employed as a macromolecular chain transfer agent,and then lauryl methacrylate(LMA)was added for chain extension reaction to synthesize a lignin-based block copolymer(lignin-g-PMMA-b-PLMA)with pressure-sensitive property.The effect of this block copolymer on the initial adhesion of soybean meal adhesive was also investigated.The analysis results o f FT-IR,1 H NMR,GPC and DSC all confirmed that LMA reacted with lignin-g-PMMA to form a block copolymer.The FT-IR spectrum of obtained lignin-g-PMMA-b-PLMA showed that the vibration absorption peak of ester group in MMA segment appeared near 1729 cm^(-1),and the absorption peak of—CH_(2)—appeared at 2922 and 2853 cm^(-1).The 1 H NMR spectrum displayed a hydrogen proton peak of—OCH 3 from PMMA atδ3.57 and a hydrogen proton peak of—O—CH_(2)—from PLMA atδ4.04.The block copolymer exhibited a significantly increased relative molecular mass,larger average particle size,broader relative molecular mass distribution(PDI=2.68),and a lower glass transition temperature(T g=-24℃)compared with lignin-g-PMMA(T g=114℃).The maximum force value of block copolymer tested via the loop tack test was 0.79 N,indicating certain pressure sensitivity.It was used in the veneering experiment for modifying soybean meal adhesives.The results showed that the decorative veneer would not warp when 10%block copolymer emulsion was added into soybean meal adhesive,showing that the initial tack of modified adhesive had been greatly improved.