REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Juan Chen,Xi Ren,Chunwang Yi,Shengpei Su,Xi Wang
A novel soft segment adipic acid-polyoxypropylene diamine copolymer with Mw = ~2000 (AA-PPA 2000) was well obtained through chain extending of bio-based polyoxypropylene diamine D400 using adipic acid (AA). This copolymer was then used to modify the diglycidyl ether of bisphenol A (DGEBA) epoxy/diethyl toluene diamine (DDM) curing system while polyoxypropylene diamine (D2000) was taken as the reference. The variable temperature FTIR (V-FTIR) spectral was used to determine the hydrogen bonds in cured epoxy resins . The crosslinking density of epoxy composites was further checked using the low field nuclear magnetic resonance (NMR) and dynamic mechanical analysis (DMA). Interestingly, SEM images of the fracture surfaces showed that there were many small holes on the fracture surface of D2000 cured composites while rough cracks were observed instead of tiny holes on the fracture surface of AA-PPA2000 modified composites indicating AA-PPA2000 had good compatibility in epoxy composites. All the findings revealed that AA-PPA 2000 was a preferable tougher compared to D2000. Higher crosslinking density was generated in AA-PPA2000 cured epoxy resin due to the formation of intermolecular hydrogen bonds and more complicated networks in the epoxy composites, leading to the synchronous enhancement of strength and fracture toughness .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2015
·
IF 2.012
Cui-Cui Wang,Jin-Hua Wang,Gui-Mei Tang,Yong-Tao Wang,Yue-Zhi Cui,Seik Weng Ng
Three new metal coordination polymers constructed from adipic acid and 2-(pyridin-3-yl)-(1H)-benzimidazole ligands, [M(ADP)(3PBI)2(H2O)2]·2H2O (M = Ni and Co for 1 and 2, respectively) and [Cd(ADP)(3PBI)(H2O)] (3) [ADP = adipic acid dianion; 3PBI = 2-(pyridin-3-yl)-(1H)-benzimidazole], have been synthesized by hydrothermal reactions and were characterized by X-ray single-crystal diffraction, elemental analyses, IR, powder X-ray diffraction, and thermogravimetry. Complexes 1 and 2 are isostructural. Both form a 1-D linear chain structure, which is further assembled into a 3-D supramolecular framework by π⋯π stacking and hydrogen bonding interactions. Complex 3 possesses a binuclear unit and displays a 2-D layer which is further extended to a 3-D supramolecular architecture via hydrogen bonding and other weak packing interactions. The luminescent properties of 3 were investigated in the solid state at room temperature.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Shuang Wei,Mengyue Li,Kexin Li,Sheng Zhong,Yatao Su,Ruirui Zhang,Ruixia Liu
The oxidation of cyclohexane to produce adipic acid suffered from the inefficient and polluting two-step process. We introduce the CuCo Prussian blue analogues derived in situ C, N doped CuCo composite catalysts in the selective oxidation of cyclohexane. Due to the in-situ doping of C and N elements in the form of active graphite carbon and pyridine nitrogen, the oxygen vacancy content and the ability to activate oxygen are improved. The one-step efficient catalytic oxidation of cyclohexane to adipic acid was realized due to the excellent electron transfer performance between C, N elements and metals.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Dongguang Yan,Shilong Zhao,Chi Ge,Jianzhou Gao,Chengyu Gu,Yingqiang Fan
The complicated preparation process and difficulty of recycling were serious obstacles to the widespread use of solid-solid phase change materials (PCMs). Herein, we reported a novel thermoplastic solid-solid PCMs prepared by a facile one-step feeding method. In this study, the esterification and transesterification among the molten mixture of PBT , PEG and adipic acid were conducted to prepare thermoplastic PEG/PBT/Adipic acid copolymer-based PCMs. Adipic acid, as an auxiliary encapsulation agent, could prevent effectively PEG leakage of PEG/PBT/Adipic acid copolymer-based PCMs with high PEG and low PBT content during the phase change process . For PCM-6 containing 91 wt% PEG, 8 wt% PBT and 1 wt% adipic acid, there were no changes in the shape and chemical structure after multiple thermal cycles. The TG results presented that the initial thermal degradation temperature of PCMs-6 was above 200 °C, which was much higher than the processing and working temperature of PCMs-6. The latent heat of PCMs-6 could reach 136.8 J/g, showing great potential for energy storage, especially in the field of green buildings.
研究领域:
材料科学
·
高分子化学
·
能源材料
·
热功能材料
·
绿色建筑
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 113
·111787-111796
·
IF 3.289
Shang Liu,Guixiang Ma,Shaolei Xie,Yongzhong Jia,Jinhe Sun,Yan Jing
Manipulating the phase transition behaviour of phase change materials (PCMs) to a favorable range is an urgent issue which poses a considerable challenge to their widespread application, since PCMs with desirable operational temperatures and high efficiency are very few in practice. An attempt to address this puzzle is presented by confining adipic acid in silica scaffolds through an impregnation method. Three different nanoscale chambers – 2D-hexagonal silicas MCM-41 and SBA-15, and 3D-silica mesoporous foam (MCF) – were employed. In this way, novel form-stable PCMs were developed, which acquired size-dependent thermal behaviour. The evolution of thermal behaviour as a function of pore size was investigated. Phase transition temperature (Tm) deviations presented a strong linear relationship with inverse pore sizes, conforming to the modified Gibbs–Thomson equation. Enthalpy changes (ΔHm) shared the same trend with Tm, as pore sizes decreased, while the variation of phase transition temperatures (ΔTm) was in the opposite direction. Unlike the bulk state, the phase transition temperature of adipic acid in a confined space could be regulated over 90 °C. The maximum thermal storage efficiency was 72% with respect to the confined acid content. Thus, the solid–liquid phase transition behaviour of adipic acid in a confined space could be altered, and the manipulation of thermal behaviour was achieved.
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Xiao Liang,Menglei Li,Qingmao Yang,Chun Shen,Tianwei Tan
Production of biobased adipic acid through hydrogenation of cis,cis -muconic acid has received worldwide attention, but suffers from low efficiency and high cost caused by utilization of noble metal-based catalysts in organic solvent with low initial concentrations. Herein, we propose a new paradigm to produce biobased adipic acid by development and application of a Ni/Al 2 O 3 catalyst system in conjunction with a micropacked-bed reactor. Catalyst screening and effects of reaction conditions have been systematically investigated in a batch reactor, achieving 99.4 % yield using sodium muconate aqueous solution (170 g/L) as the substrate. Furthermore, 99.9 % yield is also obtained with only 110 s residence time and 100 g/L initial concentration. The space–time yield is as high as 21.0 mg/min/mL, which is 2–4 orders of magnitude higher than those of Pd (0.178 mg/min/ml) or Pt (0.0044 mg/min/ml) catalysts. This work may be constructive for efficient production of biobased chemicals in microreactors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOTECHNOLOGY AND BIOENGINEERING
·
2014
·Vol. 111
·期 12
·2580-2586
·
IF 4.164
Jia-Le Yu,Xiao-Xia Xia,Jian-Jiang Zhong,Zhi-Gang Qian
The C6 dicarboxylic acid, adipic acid, is an important platform chemical in industry. Biobased production of adipic acid is a promising alternative to the current petrochemical route. Here, we report biosynthesis of adipic acid using an artificial pathway inspired by the reversal of beta-oxidation of dicarboxylic acids. The biosynthetic pathway comprises condensation of acetyl-CoA and succinyl-CoA to form the C6 backbone and subsequent reduction, dehydration, hydrogenation, and release of adipic acid from its thioester. The pathway was first tested in vitro with reconstituted pathway enzymes and then functionally introduced into Escherichia coli for the biosynthesis and excretion of adipic acid into the culture medium. The production titer was increased by approximately 20-fold through the combination of recruiting enzymes that were more suitable to catalyze the synthetic reactions and increasing availability of the condensation substrates. This work demonstrates direct biosynthesis of adipic acid via non-natural synthetic pathway, which may enable its renewable production. Biotechnol. Bioeng. 2014;111: 2580–2586. © 2014 Wiley Periodicals, Inc.
研究领域:
生物技术
·
代谢工程
·
合成生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-16
·
IF 14.7
Liu Xiang,Zhu Yu-Quan,Li Jing,Wang Ye,Shi Qiujin,Li An-Zhen,Ji Kaiyue,Wang Xi,Zhao Xikang,Zheng Jinyu,Duan Haohong
Electrosynthesis of adipic acid (a precursor for nylon-66) from KA oil (a mixture of cyclohexanone and cyclohexanol) represents a sustainable strategy to replace conventional method that requires harsh conditions. However, its industrial possibility is greatly restricted by the low current density and competitive oxygen evolution reaction. Herein, we modify nickel layered double hydroxide with vanadium to promote current density and maintain high faradaic efficiency (>80%) within a wide potential window (1.5 ~ 1.9 V vs. reversible hydrogen electrode). Experimental and theoretical studies reveal two key roles of V modification, including accelerating catalyst reconstruction and strengthening cyclohexanone adsorption. As a proof-of-the-concept, we construct a membrane electrode assembly, producing adipic acid with high faradaic efficiency (82%) and productivity (1536 μmol cm −2 h −1 ) at industrially relevant current density (300 mA cm −2 ), while achieving >50 hours stability. This work demonstrates an efficient catalyst for adipic acid electrosynthesis with high productivity that shows industrial potential.
研究领域:
化学工程
·
电化学
·
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mengjia Wu,Junhua Di,Lei Gong,Yu-Cai He,Cuiluan Ma,Yu Deng
Adipic acid is an important precursor for manufacturing Nylon-66, and various efficient renewable routes for adipic acid from lignocellulosic biomass are being explored. To effectively valorize biomass into adipic acid, a novel aqueous solution NaOH/ChCl:TH/water (6:24:160, wt/wt/wt) was firstly applied to pretreat sugarcane bagasse (SCB) at a room temperature (25 °C) for a short pretreatment time (1 min) for improving its saccharification efficiency. A deep eutectic solvent ChCl:TH was synthesized by mixing choline chloride (ChCl) and thiourea (TH). The cellulose structure changes of SCB were characterized by FTIR, XRD, SEM, TEM and LSCM. Composition analysis and reducing sugar yield were used to evaluate pretreatment efficiency. Hydrolysis for 72 h, the yields of reducing sugars and glucose from 40 g/L NaOH/ChCl:TH-SCB with complexed cellulases were obtained at 90.2 % and 94.1 %, respectively. Finally, the obtained SCB-hydrolysate was used for adipic acid production by E. coli MG1655 K12. Glucose in SCB-hydrolysate was consumed within 72 h, with a productivity of 0.39 g adipic acid/g glucose, accounting for 72.2 % of the theoretical yield. Further discovery, xylose in SCB-hydrolysate was also consumed for adipic acid fermentation, which contributed to an increase in adipic acid production. In view of transcriptome data, most of the genes involved in carbohydrate metabolism were most significantly up-regulated, which was conductive to improve the yield of adipic acid using biomass-hydrolysate as carbon source. Therefore, the NaOH/ChCl:TH-SCB hydrolysates were a better carbon source for adipic acid fermentation compared to commercial glucose. Obviously, this established rapid room temperature pretreatment with NaOH/ChCl:TH was proven to be effective for enhancing saccharification efficiency of SCB, and the hydrolysates had excellent adipic acid fermentability.
研究领域:
生物技术
·
生物化学工程
·
微生物学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
Chem Catalysis
·
2026
·
IF 10.7
Qingmao Yang,Yang Zhang,Xiao Liang,Haodong Chu,Mengdi Li,Runqing Xiao,Weichen Zhao,Chun Shen,Tianwei Tan
Green synthesis of biobased adipic acid (AA) from hydroxyacid feedstocks is challenging due to competing reactivity of hydroxyl and carboxyl groups. Here, we report an aqueous strategy that enables selective removal of the hydroxyl group in 2-hydroxyadipic acid (2-HAA) using a MoO x -Pd/TiO 2 catalyst with in situ -generated Mo–O–H sites. The catalyst achieves 97.3% selectivity to AA. Kinetic analyses, CO and H 2 pulse titration experiments, in situ X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations show that Mo–O–H sites preferentially interact with the hydroxyl group and promote C–O bond cleavage while suppressing side reactions. This study provides mechanistic guidance for rational catalyst design in upgrading biomass-derived hydroxyacids to value-added diacids.
✓ 已验证
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 14
·2937
·
IF 4.6
Jiaming Shi,Guiling Zhang,Shiying Yang,Dan Yang,Yuguang Jin,Xiaoyue Wan,Yihu Dai,Yanhui Yang,Chunmei Zhou
Adipic acid (AA), a pivotal precursor for nylon-6,6 and polyurethane, was synthesized via an innovative catalytic electrocatalytic oxidation strategy in this study. Four distinct MnOx/CNT nanocatalysts were prepared by hydrothermal and co-precipitation methods and fabricated into electrodes for the oxidation of cyclohexanol (Cy-OH) in a K2SO4neutral solution. Comprehensive characterization revealed that the catalytic performance depended on both crystalline phase configuration and manganese valence states. MnO(OH) and MnOxwere identified as the main active species, with the synergy between MnO species and carbon nanotubes significantly enhancing catalytic activity. Mechanistic investigations demonstrated that under Mn4+-dominant conditions, low-valence manganese species facilitated Cy-OH-to-cyclohexanone (Cy=O) conversion, while an optimal Oads/Olatratio (≈1) effectively promoted subsequent Cy=O oxidation to AA. Under optimized conditions (1.25 V vs. Ag/AgCl, 80 °C, 15 h), complete Cy-OH conversion was achieved with 56.4% AA yield and exceptional Faradaic efficiency exceeding 94%. This work elucidates manganese-based electrocatalytic oxidation mechanisms, proposes a sequential reaction pathway, and establishes an environmentally benign synthesis protocol for AA, advancing sustainable industrial chemistry.
研究领域:
电化学
·
催化
·
纳米技术
·
绿色化学
·
材料科学
·
有机合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Binwei Shen,Qinbo Wang,Yufang Wang,Xiang Ye,Fuqiong Lei,Xing Gong
The solubilities of adipic acid in acetic acid + water mixtures at (303.2 to 333.2) K and acetic acid + cyclohexane mixtures at (303.2 to 343.2) K are measured. The measured solubility of adipic acid in acetic acid + cyclohexane mixtures with the mass fraction of acetic acid in the solvent mixtures at (0.1 to 1.0) decreases with increasing mass fraction of cyclohexane at constant temperature. However, for the solubility of adipic acid in acetic acid + water with the mass fraction of acetic acid in the solvent mixtures at (0 to 1.0), acetic acid with a mass fraction of 50 % has the best dissolving capacity for adipic acid at constant temperature. The experimental data was correlated by the nonrandom two-liquid (NRTL) activity coefficient model, and the values of the solubilities calculated using the model showed good agreement with the experimental observations.
研究领域:
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
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