JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Qin Huang,Bingshou Gong,Habibullah,Ziyuan Wang,Yao Wang,Yigang Yan,Yungui Chen,Chaoling Wu
Hydrolysis of magnesium-based materials is a promising hydrogen source for fuel cells. Our previous work (Liu et al. 2015) proposed the 30 wt% calcium-magnesium alloy hydrides (MCH) with superior hydrolysis performance than magnesium and magnesium hydride. But the easily-happened cold-welding reduces the pulverization efficiency. Additionally, the hydrolysis conversion rate at room temperature remains low. In current work, we have explored the novel composites including MCH and 0-20 wt% expanded graphite (EG) to examine the impact and underlying mechanisms of EG as additive in mitigating cold-welding and enhancing hydrolysis. The results suggest that EG coats on the material surface as a dispersant to prevent cold-welding, optimize ball milling efficiency and reduce particle size, further facilitating hydrogenation and hydrolysis. In deionized water , MCH with 10 wt% EG (MCH-10EG) displays the best hydrolysis performance, with a low activation energy of 11.26 kJ mol −1 and a complete conversion within 8 min at 55 °C. Moreover, at room temperature, combined with the corrosion effects of Cl − and H + to break the formed magnesium hydroxide passivation layer , MCH-10EG achieves a complete conversion within only 5 min in 0.3 mol L −1 aluminum chloride solution. This work may significantly advance the large-scale production and practical application of magnesium-calcium-based hydrolysis materials as hydrogen source.
研究领域:
材料科学
·
氢能技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jiawei Mao,Tianping Huang,Subrata Panda,Jianxin Zou,Wenjiang Ding
In this work, Mg(In) and Mg(Ag) solid-solution ultrafine particles were successfully synthesized by using a direct current (DC) arc-plasma method and their hydrogen storage and hydrolysis behaviors were thoroughly investigated. In particular, microstructural analyses clearly reveal that MgH 2 @MgIn and MgH 2 @MgAg composites are autogenerated upon hydrogenation via the formation of nano MgIn or MgAg intermetallic phase on MgH 2 : Mg(In/Ag) + H 2 ⟷ MgH 2 + MgIn/MgAg. Upon dehydrogenation, in-situ TEM observations confirm that the reverse reaction occurs through the diffusion of In/Ag from the MgIn/MgAg phase to MgH 2 . Such a diffusion process is coupled with the decomposition of MgH 2 , leading to the microstructural transition from MgH 2 @MgIn or MgH 2 @MgAg to corresponding solid solutions. For Mg-In system, the discovery of the intermediate phase Mg 3 In through in-situ TEM observation indicates that the dehydrogenation process is a two-step reaction dominated by the diffusion of In. Meantime, the improved hydrolysis performances of the MgH 2 @MgIn and MgH 2 @MgAg composites are primarily attributed to the direct participation of MgIn/MgAg in the hydrolysis reaction, providing more active sites for accelerating hydrogen yield. Therefore, the introduction of In or Ag into Mg has provided with noticeable improvements in the hydrogen storage as well as the hydrolysis properties of MgH 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Tianle Xu,Xinran Ju,Hui Tang,Wenli Xiang
Fir wood was modified using epoxy soybean oil, diethylene glycol, and maleic anhydride as raw materials to enhance its mechanical properties, thermal stability, and water resistance. Diethylene glycol first opens the epoxy ring of the soybean oil and then reacts with maleic anhydride to produce an esterification reaction. The product modifies the fir wood through a chemical impregnation method. A systematic evaluation of the modified wood’s weight gain ratio, density, mechanical properties, thermal stability, water resistance, and microstructural changes was conducted. The results show that the compressive strength increased from 38.1 to 94.9 MPa, the water absorption rate decreased from 158.03 to 6.93%, and the thermal stability was also enhanced. This study provides a simple, low-cost, and green method for improving the comprehensive performance of fast-growing fir wood, offering new insights for achieving sustainable development and green chemical engineering.
研究领域:
木材科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Weiqi Chen,Hanxu Zhu,Han Hu,Qingyang Luan,Qi Jiang,Peng Liang,Linyi Hu,Jie Feng,Jinggang Wang,Jin Zhu
Most degradable polymers are utilized in applications below 100°C. Developing materials with high thermal performance (specifically high glass transition temperature) is critical to expanding their application range. Here, N,N′-trans-1,4-cyclohexane-bis (pyrrolidone-4-methyl carboxylate) (T-CBPMC), a tricyclic diester, was prepared via Michael addition-cyclization of renewable feedstocks and further used as a monomer to synthesize poly (ethylene-co-cyclohexanedimethylene-1,4-cyclohexane-bis (pyrrolidone-4-methyl carboxylate)) (PECP) copolyesters, with 1,4-cyclohexanedimethanol (CHDM) molar content ranging from 0% to 95% relative to the total diol. The copolymerization of ethylene glycol (EG) significantly accelerated chain length, yielding PECP copolyesters with number average molecular weight (M n ) ranging from 29.1 kDa to 48.4 kDa. The T-CBPMC units effectively enhanced the glass transition temperature (119-133°C) and crystallization property of PECP, endowing it with superior thermal properties. Furthermore, the pyrrolidone ring exhibits outstanding ultraviolet shielding efficacy. Despite their steric hindrance, pyrrolidone rings also conferred hydrophilicity to the polymer. PECP copolymers exhibited adjustable hydrolysis rate at room temperature, by varying the CP compositions, with weight loss varying from 5% to 68% after 60 days. Structural, morphological, and molecular weight analyses after hydrolysis revealed that cleavage preferentially occurred at the ester bonds linking T-CBPMC and EG. Combining rigid T-CBPMC and CHDM with EG provided a better balance, the CP segments enhanced the T g and crystallization capabilities of the polyester, whereas the EP segments imparted hydrolysability.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhenji Li,Zhao Zhang,Jun Guo,Hongwei Jia,Wei Zhao,Lijun Lei,Que Huang,Lang Han,Changcheng Liu,Li Guo
MgH₂ is recognized as a promising material for hydrogen production due to its high hydrogen density, abundant availability, and non-polluting hydrolysis by-products, making it a viable hydrogen source for fuel cells. This study, for the first time, investigates the hydrogen production performance of the MgH₂-MOx-NaH (M = Ti, Zr, Mo, Fe, V, Bi) system, which exhibits remarkable hydrolysis properties in aqueous solutions. A series of MgH₂-MOx-NaH composite powders were synthesized via mechanical ball milling. The results revealed that V₂O₅-NaH and Bi₂O₃-NaH significantly enhanced the hydrolysis performance of MgH₂ for hydrogen production. Specifically, Bi₂O₃-NaH and V₂O₅-NaH effectively refined MgH₂ particles and mitigated agglomeration during the milling process. Hydrolysis tests demonstrated that the conversion rate and the hydrogen generation rate (mHGR) of composites initially increased with ball milling time and then decreased. The maximum hydrolysis hydrogen production yield and conversion rate for MgH₂-Bi₂O₃-NaH and MgH₂-V₂O₅-NaH composites occurred at a ball milling duration of 10 hours, and reached up to 1354.1 mL g⁻¹ (88.5 %) and 1273.5 mL g⁻¹ (81.8 %), respectively, within 8 minutes. Kinetic tests of hydrolysis hydrogen production showed that the reaction rate and hydrogen conversion increased with elevated hydrolysis temperatures. The activation energies for the hydrolysis of MgH₂-MOx-NaH (M = Ti, Zr, Mo, Fe, V, Bi) were calculated from the hydrolysis-hydrogen production curves using the Arrhenius formula, yielding values of 41.32, 37.66, 36.40, 34.60, 30.80, and 27.17 kJ mol⁻¹, respectively. The lower activation energies for hydrolysis indicate improved reaction kinetics, suggesting that the incorporation of transition metal oxides and sodium hydride effectively enhances both the hydrolytic conversion and reaction rate of MgH₂.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Xi Zhou,Qingyi Xie,Chunfeng Ma,Zijian Chen,Guangzhao Zhang
Silyl acrylate copolymers are promising materials for marine antibiofouling. However, their structures need optimizing to improve their erosion and mechanical properties. We have prepared copolymer of 2-methylene-1,3-dioxepane (MDO), tributylsilyl methacrylate (TBSM) and methyl methacrylate (MMA) via radical ring-opening copolymerization. Such polymer has a degradable backbone and hydrolyzable side groups. Our study demonstrates that as the ester units in the backbone increase, the degradation rate increases but the swelling decreases in seawater. The degradation is controlled by the polymer composition or the molar ratio of the ester units in the backbone to the silyl ester side groups. Moreover, such polymer can serve as a carrier and controlled release system for organic antifoulants. Marine field tests show that the system consisting of the copolymer and organic antifoulant has good antifouling performance depending on the polymer composition. It can effectively inhibit the colonization and growth of marine organisms when MDO content is above 20 wt %.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2012
·Vol. 20
·期 6
·642-649
·
IF 1.153
Liu Xin,Xu Kai,Liu Huan,Cai Hualun,Fu Zien,Guo Ying,Chen Mingcai
Four series of cross-linked polyurethanes with polyester polyols as soft segments were prepared by selfcuring of isocyanate-terminated polyurethanes. Polyester polyols herein were derived from different dimer fatty acids weight content, such as dicarboxylic acid leading to various hydrophobicity and steric hindrance. The structure of cross-linked polyurethane was characterized by Fourier transform infrared spectroscopy (FTIR). The surface properties and mechanical and thermal properties of cross-linked polyurethane were investigated using contact meter, tensile tester, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that with increasing dimer fatty acid weight content from 0% to 100%, the cross-linked polyurethanes exhibited increased hydrophobicity (water contact angle increased from 91o to 96o), improved water resistance (water uptake decreased from 1.41% to 0.34%), toluene resistance (weight loss decreased from 33.2% to 22.7%), and hydrolytic resistance (weight loss decreased from 0.60% to 0.27%), enhanced mechanical properties (tensile strength increased from 1.3 to 4.8 MPa), and thermal stability (decomposition temperature of 50% weight loss increased from 425 to 462 °C).
研究领域:
高分子材料科学
·
生物医学工程
·
表面化学
·
药物递送系统
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 41
·19642-19650
·
IF 3.5
Chu Yican,Yao Zhendong,Liu Min,Li Wenqing,Gu Jing,Huang Zhenguang,Xie Jiaxing,Li Chao,Cui Yongfu,Li Yun,Fan Meiqiang
The hydrolysis of silicon and its compounds to produce hydrogen for fuel cell remains a major problem. The main obstacle is the weak hydrolytic activity and slow kinetics of silicon. In this work, the alloying properties of Si and Ca to improve its hydrolytic activity, and studied the film breaking effect of different metals and halogen ions on its passivation layer. The results show that the hydrogen production of the alloy is still determined by its phase composition. Among the common metal (Ni, Bi, Sn) and halogen ions (F – , Cl – ) catalyzed by hydrolysis, Ni and F – showed a good synergistic effect, resulting in a hydrogen yield of 269 mL/g at room temperature without alkali. Graphical
The effects of metal ions and halogens on the hydrolytic properties of Ca–Si alloy were investigated, and Ni 2+ and F — showed good synergistic effect.
研究领域:
材料化学
·
能源材料
·
无机化学
·
氢能源
·
金属合金
✓ 已验证
DOI
高影响因子
POLYMER
·
2016
·
IF 3.586
Jin Wang,Hongming Zhang,Yuyang Miao,Lijun Qiao,Xianhong Wang,Fosong Wang
UV-curable waterborne polyurethanes (CO 2 -UV-WPUs) with CO 2 -polyols as soft segment were firstly synthesized. In addition to the good mechanical performance, the coexistence of carbonate and ether moieties in soft segment assured the excellent hydrolysis resistance of CO 2 -UV-WPU compared with polybutylene adipate glycol based waterborne polyurethane (PBA-UV-WPU). Its retention of tensile strength reached 88% after 15 h immersion in 1.5% sodium hydroxide solution, while that of PBA-UV-WPU completely lost its mechanical property. The double bond density primarily governed the mechanical performance of CO 2 -UV-WPU, when it increased from 0.93 mmol/g to 2.4 mmol/g, the tensile strength increased from 29 MPa to 67 MPa, while elongation at break decreased from 150% to 9.6%, accompanied by the reduction of maximum water swelling percentage from 26.7% to 14.5%. The introduction of CO 2 -polyol as soft segment not only created a route to produce UV-curable waterborne polyurethane from CO 2 , but also provided polyurethane with novel value-added performance like good hydrolysis resistance. Moreover, the thermal/mechanical performance and hydrophilicity of CO 2 -UV-WPUs could be conveniently adjusted by controlling molecular weight of CO 2 -polyols, ensuring the application feasibility of CO 2 -UV-WPU.
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
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xiaoyun Li,Junwei Wang,Maoqing Kang,Yuhua Zhao,Qifeng Li,Chen Liang
Carbon dioxide based amino-alcohol compound (CO 2 -AA) with both alcohol and amino units in the molecular was prepared by chemical fixation of CO 2 with 1, 4-butanediol diglycidyl ether and ethylenediamine, which was further used as chain extender to the preparation of waterborne polyurethanes (CO 2 -WPUs). Since the reacting activity of isocyanate groups in WPU prepolymer with NH 2 was much faster than that with OH, hydroxyl groups could be maintained in the system and strengthen the hydrogen bonding interaction in WPU endowing the materials with some special properties. Specifically, the unique structure of CO 2 -AA improved mechanical, water/solvents resistance and hydrolysis/oxidation resistance properties of CO 2 -WPUs. Mechanical properties of the CO 2 -WPUs changed slightly during immersion in water, 0.25% NaOH and 6.00% H 2 O 2 solution, while the WPUs prepared from typical chain extender ethylenediamine almost lost their mechanical properties after immersed in the solutions for 5 h. Moreover, the CO 2 -WPU films showed considerable thermal stability. The study suggested the novel CO 2 -AA might be a promising chain extender to improve the water/solvent resistance and hydrolysis/oxidation resistance of WPU.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiaowei Zhou,Yuchen Zhang,Guolong Huo,Zhiguang Zhang,Junhao Xin,Shuanyan Kang,Zhenggong Wang,Nanwen Li
Membrane based dehumidification technology has attracted wide attention. The anti-hydrolytic property of the membrane holds a significant role in its long-term operation in a wet environment. Herein, a series of fluorinated aromatic polyamides (FPA) are first proposed for stable air-dehumidification. Amide bond offers superior hydrolytic stability over chemical bond in the present dehumidification membrane. The deliberately introduced bulky fluorinated group (-CF 3 ) increases the water permeability and enhances the anti-hydrolytic property of the FPA membranes. The membrane separation performance and membrane stability are further tuned by adjusting the molar ratio of para- and meta-amide groups to optimize the intermolecular forces and polymer chain arrangement, which is verified by the refractive index data and wide-angle X-ray diffraction results. The obtained co-FPA membranes exhibit tunable gas and water vapor permeation properties. With increasing para-amide group content, the gas and water vapor permeability of copolyamides gradually decreases and the selectivity of H 2 O/N 2 increases. Meanwhile, the hydrolytic stability of the co-FPA membranes increases with the increase of TPC content as verified by 1 H NMR, GPC , and mechanical property tests. Among these co-FPA membranes, the co-FPA-70 membrane exhibits the most excellent hydrolytic stability. The membrane shows almost no change in 1 H NMR spectra and 97% retention of tensile strength after 5000 h of hydrolysis reaction. In the meanwhile, it shows excellent separation stability with a water vapor permeability retention of 74% during long-term hydrolysis aging operation. This study demonstrates the great potential of polyamide for the fabrication of dehumidification membranes with high hydrolysis resistance.
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
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shuai Sun,Lipeng Wang,Pingan Song,Liping Ding,Yongping Bai
Phosphite antioxidants are extensively used in polyester industry due to extraordinary antioxidative and chromaticity protection capabilities. Unfortunately, they are highly susceptible to hydrolysis leading to reduced antioxidative activity, which remains unsatisfactorily addressed so far. In this work, we have demonstrated the fabrication of hydrolysis resistant hybridized phosphite antioxidants (PSLDH) by physically melt-blending with layered double hydroxides (LDH) based on the hydrolysis mechanism. X-ray diffraction measurements indicate that basically phosphite antioxidants are physically hybridized with the LDH. Accelerated hydrolysis results show that as-fabricated hybridized phosphite antioxidants show much superior anti-hydrolysis capability to the unmodified counterpart because the basic LDH can neutralize the phosphoric acid created during hydrolysis, thus effectively prohibiting the self-catalytic effect. High performance optical poly(ethylene terephthalate) (PET) materials are then synthesized by in situ adding PSLDH in the polycondensation process. Only adding 0.05 wt% of the PSLDH containing 10 wt% of LDH can remarkably improve the anti-oxidative and chromaticity performances of the resultant PET. This work provides an innovative methodology for developing high-performance value-added chemical additives via facile physical hybridization.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）