文献类型：期刊文献

英文题名：Optimization of ultrasound-assisted lignin depolymerization using response surface methodology for low-formaldehyde emission wood adhesives

作者：Ma, Lin[1] Shi, Xiaoyu[1] Liu, Jingyi[1] Gao, Shishuai[1] Zhang, Daihui[1,2] Cheng, Zenghui[1] Lai, Chenhuan[2] Xu, Yuzhi[1]

通信作者：Cheng, ZH[1];Xu, YZ[1];Lai, CH[2]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Nanjing 210037, Jiangsu, Peoples R China

年份：2025

卷号：227

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20251118042813);Scopus(收录号：2-s2.0-86000470539);WOS:【SCI-EXPANDED(收录号:WOS:001446375800001)】；

基金：We acknowledge the support from the National Natural Science Foundation (32494792, 32201508, 32271809) .

语种：英文

外文关键词：Lignin; Ultrasound-assisted depolymerization; Oligomers; Response surface methodology; Lignin-phenol-formaldehyde resin

摘要：The heterogeneity, high molecular weight, and low content of functional groups have limited the high-value utilization of lignin to prepare high-performance resins. To overcome this obstacle, ultrasound-assisted lignin depolymerization was investigated as a gentle, efficient, and inexpensive method to improve the functionality and homogeneity of lignin. The response surface methodology combined with the Box-Behnken design was employed to optimize the yield and molecular weight of oligomeric lignin by varying three parameters: sonication time, lignin mass fraction, and solvent ratio. The predicted optimal yield (33 %) and molecular weight (Mn = 700) under optimal conditions (3 h, 14.3 % lignin, and MeOH/H2O = 3:1) were almost the same as those obtained experimentally (Mn = 710), yield of 33.8 %, proving the validity of the model. The depolymerized lignin (DL) was directly substituted for phenol to prepare depolymerized lignin phenol-formaldehyde resins (DLPF). The rheological and adhesive properties of these resins were compared with pure PF resin and lignin phenol-formaldehyde (LPF) resins. An enhanced bonding strength, but lower curing temperature and formaldehyde emission, were observed. This study presents a cost-effective and efficient method to prepare depolymerized lignin as the precursors of high-performance resins.