林业工程学报2025，Vol.10Issue(5)：91-103,13.DOI:10.13360/j.issn.2096-1359.202405032
木质素基环氧聚合物的构建及其光热转化应用
Fully biobased epoxy resin with structure-controlled lignin as a light-absorbing material for enhanced photothermal conversion efficiency
摘要
Abstract
Nowadays,sustainable epoxy resins with permanent cross-linking networks synthesized from renewable resources are garnering significant attention.Biomass resources,particularly plant oils,contain multiple reactive groups that enable the formation of highly cross-linked epoxy resins.However,the inherent flexibility of these materials often leads to suboptimal mechanical properties,thereby limiting their applications.This study aimed at enhancing the mechanical properties of epoxy composites by incorporating lignin into plant oil-based epoxy polymers,specifically targeting improvements in rigidity and modulus.This research explored the potential applications of these epoxy composites and highlighted the role of lignin in polymer materials.The initial step involved modifying the hydroxyl functional groups of lignin using 10-undecylenoyl chloride and oleic acid chloride.Nuclear Magnetic Resonance(NMR)spectroscopy and gel chromatography were employed to ascertain both the chemical structure and molecular weight of the modified lignin samples.It was determined that both 10-undecylenoyl chloride and oleyl chloride successfully modified lignin via ester bonds at their hydroxyl positions.The esterification grafting rate for oleyl chloride was found to be 38.1%,while a small number of active hydroxyl and carboxyl functional groups remained intact post-modification.Various thermosetting epoxy resins were synthesized by blending esterified lignin with plant oil-based epoxy polymers.Notably,oleyl chloride-modified lignin exhibited greater compatibility in forming homogeneous epoxy composites compared to lignin modified with 10-undecylenoyl chloride.The curing temperature and time for the oleyl chloride-modified lignin/plant oil-based epoxy resin were established using differential scanning calorimetry(DSC),indicating an optimal curing condition at 100℃for 7 h for complete curing of epoxies containing 10%modified lignin.The mechanical and thermodynamic properties of these composites were evaluated through thermogravimetric analysis(TGA)and dynamic mechanical analysis(DMA).The results indicated that the residual active functional groups present in the modified lignin could participate in the curing behavior of the epoxy polymer,thereby enhancing both the mechanical and thermodynamic properties of the resulting resin.The thermal response characteristics of lignin/plant oil epoxy composites were assessed using the near-infrared laser technology in conjunction with infrared thermal imaging techniques to investigate potential thermal responsiveness attributed to lignin.Findings revealed that these polymers exhibited excellent thermal responsiveness,capable of rapidly increasing from ambient temperature to 140℃within just 20 s,while also demonstrating commendable sustained photothermal conversion efficiency over 100 s.This study presents an effective approach for developing adjustable epoxy composites with enhanced mechanical properties and increased thermal responsiveness.关键词
植物油/木质素/化学修饰/热固性高分子/光热响应材料Key words
plant oil/lignin/chemical modification/thermosetting polymers/photothermal-responsive materials分类
化学化工引用本文复制引用
何娟,章亚琼,黄曹兴,黄晨,蒋峰,汪钟凯..木质素基环氧聚合物的构建及其光热转化应用[J].林业工程学报,2025,10(5):91-103,13.基金项目
国家重点研发计划(2022YFD2200802) （2022YFD2200802）
安徽省自然科学基金(2208085QC90). （2208085QC90）
