INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yueqiang Yang,Han Wan,Baiwang Wang,Bitun Wang,Kang Chen,Haiyan Tan,Ce Sun,Yanhua Zhang
Bamboo fiber (BF) is favored by people for its renewability, low cost, fast growth, low density, high hardness, pollution-free, and easy harvesting. However, when preparing composites by blending and extruding BF and degradable plastic PLA , the significant difference in polarity between the two leads to a significant decrease in mechanical properties, which limits the application of BF in bamboo plastic composites. In order to improve the compatibility between PLA and BF, this study used polymerized carbodiimide (PCD) as a compatibilizer to prepare modified BF/PLA composites and investigate the effect of BF content on the composites. The results showed that the addition of PCD increased the flexural strength , flexural modulus , impact strength , tensile modulus and tensile strength of PCD-BF/PLA compared to BF/PLA composites, with the impact strength increasing the most significantly by 20.91 %. Meanwhile, the tensile strength improved by 15.06 % from 55.1 MPa to 63.4 MPa, and the flexural strength improved by 14.82 % from 80.3 MPa to 92.2 MPa. The experimental investigation of BF content revealed that when the ratio of BF to PLA was 4:6, the impact and flexural strength of the BF composites did not significantly decrease, but the flexural modulus and tensile strength increased, with the flexural modulus increasing the most significantly by 90.53 % compared to PLA, while the cost has been reduced by 13.80 %. The porosity experiment also showed that as the BF content increased, when the ratio of BF to PLA was 4:6, the porosity of the composite material was only 3.98 %, which was not further significantly increased compared to 3.62 %. The prepared high proportion biomass can be used in tableware, and other fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Fuzhou Wang,Guoyong Xu,Qingshan Li,Ryo Tanaka,Yuushou Nakayama,Takeshi Shiono
The first example of a 3-alkene polymerization has been successfully achieved with 3-heptene in the presence of phenyl-substituted α- diimine nickel precatalysts activated by dMMAO, and compared with the corresponding linear alkenes, i.e., 1-pentene, 2-hexene and 4-octene polymerizations. The microstructures of the produced poly(3-heptene), which consists of ethyl , propyl and butyl branches indicated the 3,4- and 4,3-insertion, followed by chain-walking, with incorporation of a small fraction of long methylene sequences of 1,7-enchainment via monomer-isomerization. Late-transition metal catalyzed polymerization reactions of internal alkenes to synthesize novel polyolefin materials are highly important and also highly challenging. Upon activation with dried modified methylaluminoxane (dMMAO), the first example of a 3-alkene polymerization has been successfully achieved for 3-heptene catalyzed by phenyl-substituted α- diimine nickel complexes in comparison, and compared with the polymerizations of the corresponding linear alkenes, i.e., 1-pentene, 2-hexene and 4-octene. The results indicate that the polymerization of 3-heptene was achieved via chain-walking to generate branched amorphous polymers with glass transition temperature of ca. −68 °C. The microstructures of the produced poly(3-heptene) indicated the 3,4- and 4,3-insertion followed by chain-walking, the latter being predominant. The NMR analyses of the polymers showed that the obtained poly(3-heptene) possessed ethyl, propyl and butyl branches and a small amount of the long methylene sequence of 1,7-enchainment via monomer-isomerization. The branches structures were significantly dependent on the polymerization temperature, and the content of propyl branches derived from 3,4-insertion decreased with an increase in the polymerization temperature.
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
Materials Today Communications
·
2025
·
IF 4.5
Zili Ma,Yanjun Yin,Fan Li,Jinpei Hei,Yongji Wang,Yang Zhang
Aluminum (Al), with its abundance and high energy release, has attracted great interest in nanocomposite energetic systems. However, the ignition temperature and combustion performance of Al-based thermites are limited by the oxide shell coating on the Al core. A novel metal carbodiimide oxidizer has been employed to assemble thermite with superior energy release in comparison with metal-oxide-based thermite. In this work, titanium (Ti) nanoparticles have been incorporated into the Al/CuNCN system with virous mass ratio (from 0 % to 100 %) to adjust their energetic behavior in comparison with traditional Al/CuO. The component, structure and morphology of the energetic composites were charactered by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectrophotometry (FT-IR). The temporal pressure traces and heat release of Al/Ti/CuNCN and Al/Ti/CuO composites have been measured via combustion cell and calorimetry, respectively. The over pressure of Al/30 %Ti/CuNCN reached to be 80 KPa, which is higher 9 KPa than the maximum pressure of Al/Ti/CuO. The energy release for both Al/Ti/CuNCN and Al/Ti/CuO proved to be lower than that of Al or Ti with oxides (CuO or CuNCN) owing to the alloying reaction. The high pressure of Al/Ti/CuNCN may offer the potential routes to prepare gas generators, and the results would be an essential guide in designing thermites. Besides, the metal nitrides such as AlN, TiN, Ti 9 N 3.87 were obtained in the aluminothermic reaction, providing new possible for the preparation of novel materials following a self-propagating route within one second.
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
JACS Au
·
2024
·
IF 8.5
Bin Li,Ludi Wang,Yu Kang,Hong Cao,Yaoyang Liu,Qiange He,Zhongfeng Li,Xiaoyan Tang,Jing Chen,Li Wang,Chao Xu
Hydrophilic actinide masking agents are believed to be efficient alternatives to circumvent the extensive hazardous organic solvents/diluents typically employed in the liquid–liquid extraction for nuclear waste management. However, the practical application of hydrophilic ligands faces significant challenges in both synthetic/purification procedures and, more importantly, the acid resistance of the ligands themselves. Herein, we have demonstrated the combination of phenanthroline diimide framework with a biomotif of histidine flanking parts could achieve efficient separation of trivalent lanthanides/actinides (also actinides/actinides) under high acidity of over 1 M HNO3. This approach leverages the soft–hard coordination properties of N, O-hybrid ligands, as well as the energetically favored imides for metal coordination and the multiple protonation of histidine. These factors collectively contribute to the synthesis of an easily accessible, highly water-soluble, superior selective, and acid-resistant Am(III) masking agent. Thus, we have shown in this paper, by proper combination of synthetic N, O-hybrid ligand with amino acid, trivalent lanthanide and actinide separation could be efficiently fulfilled in a more sustainable manner.
研究领域:
核化学与放射化学
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环境科学
·
配位化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2013
·
IF 2.591
Jing Chen,Juan Zhang,Wenpeng Zhang,Zilin Chen
Sarcosine, a potential biomarker of prostate cancer, has drawn great attention in recent years. However, controversial research keeps arising about its role as a biomarker that might come from the two isomers (α-alanine and β-alanine) of sarcosine due to their same molecular weight and similar properties, which could interfere with the accurate detection of sarcosine. In this study, a simple and sensitive method was developed for the detection of sarcosine and the two isomers by LC with ion-trap MS through a novel derivatization reagent N , N ′-dicyclohexylcarbodiimide. N , N ′-Dicyclohexylcarbodiimide is usually considered as a condensation reagent, however, it was directly used as a derivatization reagent through a rearrangement side reaction in this study. The proposed method not only improved the chromatographic retention behavior of sarcosine and its two isomers, which was a benefit to their separation, but also dramatically enhanced the detection sensitivity of sarcosine, which was more favorable for real sample analysis. The factors affecting the productivity of the derivatization reaction, such as reaction time and amount of derivatization reagent, were systematically optimized. The method shows good linearity ( R 2 > 0.99), sensitivity with LODs of sarcosine as low as 1 ng/mL, and repeatability with the RSD < 6.07%. The developed method was applied to the analysis of urine.
研究领域:
分析化学
·
医学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yanjun Yin,Zili Ma
Well-known thermite reactions, which are strong exothermic reactions typically between a metal and an oxide, offer diverse important applications, such as the synthesis and processing of materials, detonators, and propulsion. A fascinating family of nitrogen-containing analog solid-state metal carbodiimides, with the general formula M x (NCN) y considered to be pseudo-chalcogenide or even pseudo-oxide, have drawn much attention owing to their unique physico-chemical properties. Herein, metal carbodiimides such as CuNCN are investigated as novel oxidizers for thermite reactions. We studied the Al/CuNCN thermite reaction, including thermal transformation, energy release and combustion performance, by means of complementary techniques, such as thermogravimetric-mass spectrometry (TGA-MS), differential scanning calorimetry (DSC), pressure evolution measurements and high-speed cameras. Compared to conventional Al/CuO thermite, the novel Al/CuNCN thermite system not only exhibited a strong combustion phenomenon with large energy release but also generated gases such as N 2 and (CN) 2 . Additionally, the burning flame of Al/CuNCN presented a mushroom-cloud shape and was accompanied by a large number of hot spots due to the unique combustion characteristics of blasting and gas production. Even more encouraging was that the Al/CuNCN system was able to prepare AlN materials following a self-propagating route within one second. This work sheds light on the novel application of CuNCN in thermite reactions and potential routes to prepare gas generator and AlN.
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
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 12
·e4566
·
IF 3.581
Feng He,Dan Wang,Anyang Wu,Baiyu Jiang,Zhen Zhang,Zhenmei Cheng,Zhisheng Fu,Qisheng Zhang,Zhiqiang Fan
An α-diimine nickel catalyst (Cat-1) with highly conjugated acenaphthylene backbone was synthesized and used in ethylene polymerization. Compared with typical Brookhart catalyst B-Cat, Cat-1 could produce polyethylene with both higher molecular weight (up to 5.1 × 10 5 g mol −1 ) and branching density (up to 135 branches per 1000 carbons) in good polymerization activity. The polyethylene prepared using Cat-1 with higher molecular weight and branching density possessed exceptional mechanical properties (ultimate tensile strength and elongation at break could reach 12.08 MPa and 1148%) and outstanding elastomeric recovery as compared with the polymer prepared using B-Cat. Cat-1 was synthesized using a simple reaction route and the polymerization conditions were suitable for the industrial polymerization process. The novel nickel catalyst Cat-1 is promising for producing highly resilient polyethylene elastomers industrially.
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
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zishuai Zhang,Yi Li,Gongyuan Zhao,Lin Zhu,Ye Sun,Flemming Besenbacher,Miao Yu
Thanks to the low cost, free dendritic hazards, and high volumetric capacity, magnesium (Mg)-ion batteries have attracted increasing attention as alternative energy storage devices to lithium-ion batteries. Despite the successful development of electrode materials, the real-life application potential of Mg-ion full battery systems (MIFBSs) is largely hindered by the lack of suitable electrode couples and hence low diffusion kinetics, which induce low specific capacity, poor rate performance, and low working voltage. Herein, we report an aqueous rechargeable MIFBS by employing copper hexacyanoferrate (CuHCF) as the cathode and 3,4,9,10-perylene-tetracarboxylic acid diimide (PTCDI) as the anode in 1 moL L–1 MgCl2 electrolyte. The combination of PTCDI//CuHCF allows efficient redox and convenient intercalation/deintercalation of Mg2+ at the electrodes while facilitating a fast transfer of Mg2+ between the two electrodes. As a result, the system delivers a high capacity of ∼120.3 mAh g–1 at a current density of 0.5 A g–1 after 200 operation cycles with a broadened voltage range (0–1.95 V) and maintains a capacity of ∼97.8 mAh g–1 at 2.0 A g–1 after 1000 cycles. Even at a high current density of 5.0 A g–1, the battery provides a steady capacity of ∼81.4 mAh g–1 over 5000 cycles. Moreover, after being applied at 11.0 A g–1, the system can deliver a capacity of ∼126.5 mAh g–1 at 0.5 A g–1. This work emphasizes the great promise of developing suitable electrode couples for aqueous MIFBSs to achieve high capacity and high rate.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 8
·5801-5807
·
IF 4.6
Zeen Zhang,Tianjiao Li,Yong Dong,Yangcheng Lu
This study focuses on ethylene homopolymerization catalyzed by α-diimine catalysts within a designed microfluidic system. Distinct from conventional batch reactors, this microfluidic configuration effectively eradicates the reaction environment heterogeneity, thereby guaranteeing homogeneous reaction conditions and decoupling the mass transfer from the reaction process. This unique setup enables precise modulation of ethylene concentration, facilitating the isolation of variables to scrutinize the effects of temperature and pressure on the polymerization. By varying residence times, it's revealed that the reaction rate is ethylene concentration-independent. Variable separation studies between concentration and temperature show an inverse relationship between temperature and branching degree (BD), contrasting traditional batch reactions due to ethylene concentration changes. Pressure studies indicate that higher pressure leads to lower BD. Different product structures' steric hindrances influence the reaction rate; greater hindrance slows it down. These novel findings suggest microreactors offer new perspectives on late transition metal-catalyzed ethylene homopolymerization, potentially enabling breakthroughs in mass production.
研究领域:
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 8
·3623-3630
·
IF 3.925
Dan Wang,Yaokai Wang,Caicai He,Jiangyan Li,Ahmed Olalekan Omoniyi,Siyu Lu,Xiao Li,Jianfu Zhang,Jing Sun,Zhongmin Su
Large area and mechanically stable temperature-sensitive paints (TSPs) with excellent temperature sensing properties are highly desired by industry for temperature measurement applications. Along these lines, a novel compound of TSPs composed of WPU/PCD/Eu(DBM)3Bipy (WPU: waterborne polyurethane, PCD: waterborne polycarbodiimide, DBM: dibenzoylmethane) was fabricated on a pure zinc (Zn) substrate by employing the demulsification-induced fast solidification method. On top of that, the luminescent molecular probe of Eu(DBM)3Bipy was in situ dispersed into the WPU/PCD emulsion. The thickness of the TSPs was rigorously controlled within micrometers. The TSPs can be employed based on the principle of temperature quenching for the detection of temperature change from the range of 25 °C to 85 °C. Interestingly, the highest temperature sensitivity of TSPs with 4.46 wt% Eu(DBM)3Bipy reaches the value of 48.34 × 10−3 °C (65–75 °C). Moreover, the WPU/PCD/Eu(DBM)3Bipy TSPs can be used twice without observing a reduction of the fluorescence emission intensity. In addition, the proposed TSPs exhibit excellent impact resistance (at 100 cm height and 1 kg weight) and stable mechanical connection with the Zn substrate.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Jiyao Zhao,Huimin Qi,Bernd Wetzel,Huan Li,Ga Zhang
To minimize friction and wear of dynamic rubber seals and to ensure their long-term functionality by using of an elastomer lubricating coating is of great interests. In the present work, waterborne polyurethanes (WPU) molecules were modified with polydimethylsiloxane (PDMS), and polycarbodiimide (PCD) were further added. Effect of molecular structures on macroscopic performance of the WPU coatings was comprehensively investigated. Our results demonstrated that grafting of PDMS significantly lowered the surface energy of the WPU coating, and thus decreased remarkably its friction and adhesion wear. What’s more, PCD helps construction of a dual-crosslinking structure, and thus enhances mechanical properties, chemical and wear resistance of the coating. Output of this work proposes a new strategy for developing free-maintenance lubricating technologies for numbers of dynamic rubber seals.
研究领域:
材料科学
·
表面工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2025
·
IF 2
Zili Ma,Yanjun Yin,Yuzhong Yin,Zhijun Liu,Xiaojie Yin,Yang Han,Jinpei Hei,Nanan Wang,Yang Zhang
As a strong oxidizer, ammonium perchlorate (AP) is one of the most paramount raw materials in composite solid propellants (CSP) formulations, and the thermal decomposition features of AP would directly impact the energy release and the impulsion performance of CSP. CuNCN as an example of metal carbodiimides is explored as a burn rate modifier for AP decomposition, given their oxide counterpart belonging to typical burn rate modifiers. Our results reveal that the as-prepared CuNCN can effectively accelerate the thermal decomposition of AP. The CuNCN as additive in AP mixture can reduce the activation energy of decomposition of AP and bring down the HTD of AP decomposition by 84°C. The present study highlights on the effective application of metal carbodiimides in the thermally enhanced decomposition of AP.
研究领域:
推进剂化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）