INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Chen Yang,Tao Shen,Zhuotao Tan,Wei Zhuang,Chenjie Zhu,Ming Li,Hanjie Ying
Lignin-based shape memory polymers (SMPs) have received increasing attention in the context of lignin valorization. This work designed a novel SMP with high content of lignin and high transition temperature (>150 °C) for shape memory. Soda lignin (SL) was first modified with maleic anhydride resulting in a lignin derivative (MAL) as confirmed by FTIR, 31 P NMR, 2D-HSQC and TGA. The modification results in an elevated molecular weight and reduced T g . SMPs were designed based on a penetrating lignin-maleyl network in a crystalline polyamide (PA) matrix, the former serving as the lock for the permanent shape and the latter as the reversible switch. The SMPs were prepared via procedures of solution mixing, film casting and in-situ thermal curing. Rheological study revealed that the precursors can be fully cured at 200 °C within 20 min with the aid of a bismaleimide spacer, which ensures a proper temperature window for curing. Compared to the PA/SL series, the PA/MAL series demonstrated improved mechanical properties and well-integrated interfacial morphologies, which enables efficient shape memory performance. This work provides a proof-of-concept study demonstrating that the design of crosslinked semi-crystalline polyamide/lignin dual-phase composites with modified lignin enables high-transition-temperature shape memory behavior for potential demanding applications such as in aerospace or mining engineering.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Boyu Du,Yang Sun,Bingyang Liu,Yingying Yang,Si Gao,Zhenshu Zhang,Xing Wang,Jinghui Zhou
In this work, lignin-based nanofibers were produced from corn stalk lignin (CSL)/lignin-derived bio-oil (LBO) and polyacrylonitrile (PAN) co-polymers via electrospinning. During depolymerization , the addition of phosphotungstic acid (PTA) promoted the CSL catalytic conversion to some extent, the decrease of β-O-4 aryl ether bond, molecular weight (Mw) and polydispersity (PDI) was obvious. Compared with CSL, LBO can promotes the formation of uniform and smooth lignin-based nanofibers under high replacement rates condition and maintaining good morphology. Subsequent reactions between LBO and PAN fragments formed a better-integrated co-polymers structure containing linear PAN backbone. The Td of LBO-g-PAN was improved to 153 °C and the Tg was decreased to 96.5 °C. Rheological conclusions displayed that the viscosity of PAN/LBO/DMF was 0.082 Pa s, illustrating the polymer substance could be continuously spun into filament without causing degradation of the polymer substance. LBO-g-PAN also had high thermal stability, yielding of residual mass was 56.32 wt% at 700 °C.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Xinyue Sun,Junjie Ni,Yuhan Lou,Peng Zhao,Yanyan Yu,Yilin Li,Qi Tang,Haipeng Yu,Yongzhuang Liu
Solvents with integrated functions enable directional lignin valorization for producing value-added chemicals or lignin polyols. In this study, a solvent-triggered directional lignin valorization process was developed based on the design of a biphasic deep eutectic solvent/dichloromethane (DES/DCM) system. The designed solvents exhibit a combined feature of chemical stabilization from ethylene glycol-based-DES and physical stabilization from a biphasic system. By establishing the DES/DCM, lignin was effectively functionalized into lignin polyols with high yield. Furthermore, by implementing a simple recycling procedure of the DCM phase, the reaction pathway was switched, leading to depolymerization and stabilization of the stabilized lignin polyols. This process resulted in an almost threefold increase in monomeric acetal yields. The effect of biphasic DES on functionalization or switched depolymerization of lignin was confirmed through model compound studies. Our findings demonstrate a directional lignin valorization route using the designed biphasic DES system, which offers potential applications in the production of value-added aromatic chemicals or potential intermediates for polymers.
研究领域:
化学工程
·
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xuelian Wang,Xinping Li,Chandravati Yadav,Wu Lan,Linping Wang,Yasumitsu Uraki,Jia Kang,Hui Jie Zhang,Xiangyu You
Kraft lignin (KL) is an industrial byproduct of pulp preparation from woody biomass and is mainly burned for energy recovery. To explore value-added applications of KL, it was first acetylated, and acetylated lignin (AcL) was combined with poly( N,N -dimethylacrylamide) to prepare tough lignin hydrogels crosslinked by hydrophobic lignin domains via a simple solvent exchange method. The AcL hydrogels (AcLGs) with optimum mechanical properties have a high tensile strength of 1.7 MPa, large Young's modulus of 1 MPa, and super high fracture energy of ∼47600 J m −2 . The Young's modulus and tensile strength of AcLG are 60 and 6 times higher than those of the pristine KL based hydrogel, respectively. AcLG had a weak inhibitory effect on Chinese hamster lung cell proliferation . Owing to its good mechanical properties and noncytotoxicity, AcLG has excellent potential as a biomedical material .
研究领域:
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Chi Zhang,Xueru Sheng,Haiyuan Jia,Na Li,Jian Zhang,Bing Wang,Haiqiang Shi,Qingwei Ping,Ning Li
This study aims to explore a lignin-based catalyst for the green synthesis of sustainable fuel additive using lignin-derived benzaldehyde and glycerol, byproducts from the paper industry and biodiesel preparation, respectively. This sustainable fuel additive can be refilled into biodiesel to improve the carbon atom economy, promoting resource efficiency and environmental sustainability. Kraft lignin was modified with phosphoric acid and sulfuric acid to prepare solid acid catalysts KL-HP-SO3H. A series of characterization techniques showed that phosphorylation can markedly enhance the specific surface area, while sulfonation can notably increase the acid sites and acid strength. The synergistic physical–chemical effect of phosphorylation and sulfonation collectively enhances the activity of the KL-HP-SO3H catalyst. In addition, ball milling and thermal catalysis were compared and analyzed in this study. The results show that the ball milling technology offers an advantage: it achieves a high product yield within only 15 min. The ball milling process consumes less energy than the hydrothermal reactor (21.3 vs 493.8 kWh·mol–1). From a long-term investment perspective, the ball milling process is economically superior. This study contributes an efficient catalyst strategy to green chemical synthesis while providing multifunctional utilization of lignin.
研究领域:
化学工程
·
可再生资源利用
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2018
·Vol. 20
·期 6
·1270-1279
·
IF 8.586
Li Zhao,Song Shi,Meng Liu,Guozhi Zhu,Min Wang,Wenqiang Du,Jin Gao,Jie Xu
Covalent triazine frameworks (CTFs) were reported to be effective in the oxidative cleavage of the lignin model compound 2-phenoxyacetophenone, as metal-free catalysts with O2, producing phenol, benzoic acid, methyl benzoate and methyl benzoylformate as the major products. Combining the detailed characterizations with the reaction results, the triazine structure with unique properties of CTFs contributes to their superior catalytic performance. Mechanism investigation, including isotope-labeling, radical trapping and intermediate verification experiments, was carried out. CTFs promoted the decomposition of peroxide and cleavage of both the C–C bond and C–O bond occurred. The catalyst was reusable and very stable under the present reaction conditions. When CTFs were applied to the catalytic oxidative cleavage of organosolv lignin, nearly 80% of β-O-4 ketone bonds of the oxidized lignin were converted, suggesting the potential of CTFs in lignin depolymerization.
研究领域:
化学工程
·
催化科学
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生物质转化
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产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 56
·期 1
·305-322
·
IF 2.898
Li Mingfu,Liu Yi,Chen Chunlin,Zhang Jian,Wang Shuangfei,Min Douyong
The hot water and green liquor pretreatments were conducted on Eucalyptus wood in the current study. The cellulase adsorption behavior on the isolated lignins and model compounds was clarified by a quartz crystal microbalance with dissipation (QCM-D) and atomic force microscopy (AFM). The QCM-D analysis indicated that the hot water pretreated lignin (HPL) adsorbed more cellulase than the green liquor pretreated lignin (GPL) and the protolignin (PL). The AFM analysis revealed that the interaction force between lignin and cellulase was in the order of HPL > GPL > PL which was consistent with the cellulase adsorption. The monomeric lignin model with the ketone group adsorbed more cellulase than the counterpart with the hydroxyl group or aldehyde group. The dimeric lignin models adsorbed more cellulase than the monomeric lignin models. Furthermore, the β – β dimer model adsorbed more cellulase than the β–5 and 5–5′ dimer models. This study provides fundamental knowledge for developing more efficient pretreatment technologies.
研究领域:
生物化学
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生物技术
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材料科学
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产品关联
DOI
高影响因子
ChemSusChem
·
2016
·Vol. 10
·期 3
·523-532
·
IF 7.116
Haiwei Guo,Bo Zhang,Zaojuan Qi,Changzhi Li,Jianwei Ji,Tao Dai,Aiqin Wang,Tao Zhang
Graphical W 2 C activity : Non-noble metal catalyst tungsten carbide shows high activity in the selective deconstruction of various lignin feedstocks to phenolic oils, and the impact of the structure differences on the activity of tungsten carbide is well studied. Softwood lignin shows lower hydrocracking efficiency than hardwood lignin, mainly owing to the higher molecular weights and the existence of more resistant linkages. Lignins isolated from representative hardwood, softwood, and grass materials were effectively hydrocracked to aromatics catalyzed by tungsten carbide over activated carbon (W 2 C/AC). The effects of botanical species and fractionation methods on lignin structure and the activity of W 2 C/AC were studied in detail. Gas permeation chromatography (GPC), FTIR, elemental analysis, and 2 D HSQC NMR showed that all the extracted samples shared the basic skeleton of lignin, whereas the fractionation method significantly affected the structure. The organosolv process provided lignin with a structure more similar to the native lignin, which was labile to be depolymerized by W 2 C/AC. Softwood lignins (i.e., spruce and pine) possessed higher molecular weights than hardwood lignins (i.e., poplar and basswood); whereas corn stalk lignin that has noncanonical subunits and exhibited the lowest molecular weight owing to its shorter growth period. β-O-4 bonds were the major linkages in all lignin samples, whereas softwood lignins contained more resistant linkages of β-5 and less β-β than corn stalk and hardwood lignins; as a result, lowest hydrocracking efficiency was obtained in softwood lignins, followed by corn stalk and hardwood lignins. 2 D HSQC NMR spectra of lignin and the liquid oil as well as the solid residue showed that W 2 C/AC exhibited high activity not only in β-O-4 cleavage, but also in deconstruction of other ether linkages between aromatic units, so that high yield of liquid oil was obtained from lignin.
研究领域:
化学工程
·
生物质能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Peisheng Li,Zhezhe Zhou,Genghao Zheng,Zhuolin Shao,Yuheng Zhang,Yantao Xu,Mingyue Jiang,Xiaochun Zhang
Bamboo has emerged as a promising biomass resource for sustainable development; however, its susceptibility to molds impedes further adoption. This study presents the synergistic preparation of lignin-bonded bamboo composites (LBCs) exhibiting superior mold resistance through alkali treatment and lignin compositing. According to the lignin recycling strategy, recycled lignin (RL) is extracted from the alkali waste liquid after the alkali treatment of bamboo bundles. Alkali treatment efficiently eliminates nutrients from bamboo bundles and establishes an alkaline environment that inhibits mold proliferation. Subsequently, RL is integrated into the alkali-treated bamboo bundles as an adhesive and mold inhibitor. Hot-pressing induces physical (phase change) and chemical (self-cross-linking reaction between applied lignin and residual lignin) cross-linking, endowing the bamboo composites with superior mechanical qualities. LBC demonstrated an almost complete absence of molds in the 28-day mold inhibition test, achieving 96% efficacy in mold inhibition. The flexural strength and flexural modulus are measured at 168.0 MPa and 14.7 GPa, respectively, while the flexural specific strength attains 128.74 MPa/(g/cm3). The superior mechanical qualities and mold resistance of LBC are anticipated to enhance its utilization in outdoor flooring, interior decoration, and other domains. The lignin recycle strategy reported in this study prepares bamboo composites with superior mold resistance by reintroducing lignin, highlighting its potential in mold resistance and adhesive applications and thereby facilitating sustainable utilization of bamboo materials.
研究领域:
材料科学
·
生物质材料
·
高分子复合材料
·
绿色化学
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木材科学
·
环境功能材料
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Xinwen Xu,Haiming Li,Xing Wang,Haiqiang Shi,Meihong Niu,Yongchao Zhang,Zhiwei Wang,Yanzhu Guo
As the second most abundant biopolymer, lignin remains underutilized in various industrial applications. Various forms of lignin generated from different methods affect its physical and chemical properties to a certain extent. To promote the broader commercial utilization of currently available industrial lignins, lignin sulfonate (SL), kraft lignin (KL), and organosolv lignin (OL) are utilized to partially replace phenol in the synthesis of phenol formaldehyde (PF) adhesives. The impact of lignin production process on the effectiveness of lignin-based phenolic (LPF) adhesives is examined based on the structural analysis of the selected industrial lignin. The results show that OL has more phenolic hydroxyl groups, lower molecular weight, and greater number of reactive sites than the other two types of lignins. The maximum replacement rate of phenol by OL reaches 70% w/w, resulting in organosolv lignin phenolic (OLPF) adhesives with a viscosity of 960 mPa·s, a minimal free formaldehyde content of 0.157%, and a shear strength of 1.84 MPa. It exhibits better performance compared with the other two types of lignin-based adhesives and meets the requirements of national standards.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Xiongjian Du,Shubin Wu
The synthesis of phenol via pyrolysis of lignin can be envisaged as a prospective approach for the high-value utilization of lignin, Herein, we describe an in-depth investigation of the selective modification of lignin to effectively adjust the distribution of lignin pyrolysis products. We found that hydroxypropyl modification of lignin can facilitate the elimination of methoxy from the lignin macromolecule and improve the selectivity of phenol products. In addition, increasing the carbon number of the lignin side chains causes polymerization of pyrolysis products, which is unfavorable for the synthesis of fine chemicals via lignin pyrolysis. Conversely, an increase in lignin side-chain hydroxyl content can lead to more liquid-phase products from lignin pyrolysis, and the selectivity of phenol and its congeners will also increase. As a result, the yield of liquid products obtained via pyrolysis of lignin modified via selective oxyalkylation can reach 52 %, and the relative content of phenol and its homologs can reach 45.2 %.
研究领域:
生物质化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jianbin Mo,Junjie Lei,Haixu Wang,Qingpeng Kang,Weifeng Liu,Xueqing Qiu
The characteristics of multi-hydroxyl structure and strong hydrogen bonding in polyvinyl alcohol (PVA) make its melting point close to its decomposition temperature, causing melt-processing difficulty. In this work, following the plasticization of small-molecule primary plasticizer acetamide, lignin was demonstrated as a green secondary plasticizer in realizing the melt processing and simultaneous reinforcement of PVA. During the plasticization process, lignin was able to combine with the hydroxyl groups of PVA, so as to destroy the hydrogen bonds and regularity of the PVA chains. The synergistic plasticization effect of lignin dramatically reduced the melting point of PVA from 185 °C to 151 °C. The thermal processing window of PVA composites was expanded from 50 °C to roughly 80 °C after introducing lignin. In contrast to acetamide, the addition of lignin significantly increased the tensile strength and Young's modulus of the composites to 71 MPa and 1.34 GPa, respectively. Meanwhile, lignin helped to hinder the migration of acetamide via hydrogen bonds. With the addition of lignin, the composites also displayed enhanced hydrophobicity and excellent UV shielding performance. The strategy of synergistic plasticization of lignin provides a feasible basis for the practical application of lignin in melt-processable PVA materials with good comprehensive properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）