PROPELLANTS EXPLOSIVES PYROTECHNICS
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2022
·Vol. 47
·期 4
·e202100230
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IF 2.134
Pengfei Su,Xiu-tian-feng E,Jingna Wang,Yanlong Zhu,Gao Zhang,Hai Chang,Ke Liu,Zihui Meng
The detection and separation of impurities are crucial for the quality control of triethylboron. While the purity of triethylboron is the key factor for ballistic performance, impact accuracy, and storage safety. This work will explore a modified gas chromatography-mass spectrometer method to detect and separate the impurities in synthesized triethylboron. They are identified as CH 3 CH 2 OCH 2 CH 3 , (CH 3 CH 2 ) 3 B, (CH 3 CH 2 O) 3 B, CH 3 CH 2 CH 2 CH 2 B(CH 3 CH 2 ) 2 and (CH 3 CH 2 ) 3 O 3 B 3 . Further, optimized GC conditions are demonstrated to quantify the synthesized triethylboron accurately and determine its purity. The purity of triethylboron is 96.39 % via a normalization method with high accuracy (RSD=0.05 %). The optimized GC conditions were as follows: a hydrogen flame ionization detector, nitrogen as carrier gas whose pathway was installed with a water trap and an oxygen trap, an HP-5 capillary column (30 m×0.32 mm×0.25 μm) with the column temperature of 60 °C, an inlet temperature of 120 °C, the detector temperature of 150 °C, and an injection volume of 0.6 μL. This work demonstrates a simple and precise method to analyze the synthesized triethylboron and its impurities.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Deng Yalei,Chen Xufeng,Liang Jing,Wang Yuanyuan
Stabilizing nanocrystals (NCs) with high fluorescence quantum efficiency in suitable solvents and tuning of their optical properties precisely are critical for designing and assembling optoelectrical devices. Here, we demonstrated that by replacing the original X-type ligand (R-COO-) with triethylborate (TEB), zinc-blend structure nanoplatelets (Zb-NPLs) turn from hydrophobic to hydrophilic and are quite stable in polar solvents. More importantly, a large shift of 253 meV is observed for the TEB-passivated NPLs, which can be attributed to the strain of the crystal lattice and the electron or hole delocalizing into the ligand shell. It is worth noting that unlike conventional inorganic ligands, such as metal chalcogenide complexes or halides that quench fluorescence, TEB-treated NPLs maintain 100% of their original brightness in polar solvents with a slight increase in full width at half maximum (FWHM, 32 nm). Furthermore, we explored the possibility of employing TEB as surface ligands for NPLs with different thicknesses and compositions. We believe the discovery of new surface chemistry using borate-related ligands can greatly expand the potential application areas of NPLs.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Wubing Yao,Lili He,Deman Han,Aiguo Zhong
The first transition-metal-free catalytic protocol for controlled reduction of amide functions using cheap and bench-stable hydrosilanes as reducing agents has been established. By altering the hydrosilane and solvent, the new method enables the selective cleavage of unactivated C–O bonds in amides and allows the C–N bonds to selectively break via the deacylated cleavage. Overall, this novel process may offer a versatile alternative to current methodologies employing stoichiometric metal systems for the controlled reduction of carboxamides.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
Polymer Chemistry
·
2024
·Vol. 15
·期 38
·3864-3870
·
IF 4.1
Siheng Zhang,Jianda Niu,Enci Hu,Liguo Xu,Zhixian Dong,Jinbao Xu,Caihong Lei
The synthesis of poly(L-lactide)-b-poly(amino acid) (PLA-b-PAA) block copolymers is of great interest in biomedicine due to their pronounced biodegradability and biocompatibility. However, the traditional method for preparing the functional block copolymers generally involves a tedious protection and deprotection process by covalent bonding, which may not only degrade the PLA segment during the process but also eliminate the precision in controlling the ROP of NCA. In light of this, in this study, PLA-b-PAAs were directly synthesized by the noncovalent protection between triethylborane (Et3B) and an amino alcohol initiator during the ring-opening polymerization (ROP) process of LA under mild reaction conditions, which produced amino-terminated PLA (PLA-NH2) avoiding the tedious process of the traditional method. Subsequently, the PLA-NH2 macroinitiator was employed to initiate the ROP of N-carboxyanhydride, thereby forming the well-defined PLA-b-PAA block copolymers. The noncovalent protection of hetero-initiators provides a promising platform for the design of PLA-b-PAA polymeric materials with tailored functionalities for biomedical applications.
研究领域:
高分子化学
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生物材料学
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生物医药工程
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Jianhui Li,Zaisheng Wang
Trimethyl borate (TMB) has been identified as electrolyte additive to suppress self-discharge for high voltage layered lithium-rich oxide cathode (LRO) for lithium ion batteries in our previous work. To expand pervious findings, its derivatives, triethyl borate (TEB) and tripropyl borate (TPB) with increased alkyl chains, have been considered as electrolyte additives to mitigate self-discharge behavior of LRO cathode for lithium ion batteries and we make a contrast to explain which one is better and why is better. It is found that fully charged (4.8 V, vs. Li/Li + ) LRO cathode suffers severe self-discharged issue upon storage in standard (STD) electrolyte (1 mol L −1 LiPF 6 -EC/EMC/DEC (3:5:2, in weight)). In contrast, this detrimental self-discharge behavior of LRO cathode at high voltage can be effectively depressed by introducing TEB or TPB into the electrolyte system. Combinations of electrochemical methods and multi spectroscopy techniques have been employed to evaluate effects of TEB and TPB on the LRO cathode surface . They reveal that the B–O and B–F bonds species in the film formed by TEB and TPB prevents electrolyte decomposition and protects LRO from structure transformation. These species in the film formed by TEB is much more than TPB, which explains the better effect for TEB.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2024
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IF 4.1
Qiu Hong,Zhang Peng-Fei,Zhao Jun-Peng
Organocatalysis has shown special potency for simplifying the construction of complex polymer structures. We are reporting here a one-pot synthetic pathway using amine as a selectivity-switching agent in the two-component catalytic system consisting of triethylborane (Et 3 B) and a phosphazene base. We first modelled the interactions of a variety of amines with Et 3 B by density functional theory calculations. The results indicate that the aliphatic diamines comprising both primary and tertiary amino groups, capable of forming stable intramolecular hydrogen bonds, undergo the strongest complexation with Et 3 B. Accordingly, experimental results demonstrate that the addition of such amines promptly actuates the in situ selectivity switch from Lewis pair-catalyzed ring-opening polymerization (ROP) of epoxide (propylene oxide, n -butylglycidyl ether, or glycidyl phenyl ether) to organobase-catalyzed ROP of δ -valerolactone, allowing one-pot continuous synthesis of ether-ester type block copolymers. We thus exploited the noncovalent interaction between amine and Et 3 B to refine the catalyst switch strategy by exempting it from loading of extra catalyst.
研究领域:
高分子化学
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有机化学
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材料科学
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4364
·
IF 4.2
Xin Huang,Tingting Zhao,Shuanjin Wang,Dongmei Han,Sheng Huang,Hui Guo,Min Xiao,Yuezhong Meng
A series of CO 2 -based thermoplastic polyurethanes (TPUs) were prepared using CO 2 -based poly(polycarbonate) diol (PPCDL), 4,4′-methylenebis (cyclohexyl isocyanate) (HMDI), and polypropylene glycol (PPG and 1,4-butanediol (BDO) as the raw materials. The mechanical, thermal, optical, and barrier properties shape memory behaviors, while biocompatibility and degradation behaviors of the CO 2 -based TPUs are also systematically investigated. All the synthesized TPUs are highly transparent amorphous polymers, with one glass transition temperature at ~15–45 °C varying with hard segment content and soft segment composition. When PPG is incorporated into the soft segments, the resultant TPUs exhibit excellent self-healing and shape memory performances with the average shape fixity ratio and shape recovery ratio as high as 98.9% and 88.3%, respectively. Furthermore, the CO 2 -based TPUs also show superior water vapor permeability resistance, good biocompatibility, and good biodegradation properties, demonstrating their pretty competitive potential in the polyurethane industry applications.
研究领域:
材料科学
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高分子化学
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环境科学
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DOI
PubMed
高影响因子
MACROMOLECULES
·
2026
·
IF 5.2
Mingsheng Liu,Lian He,Shuanjin Wang,Dongmei Han,Sheng Huang,Min Xiao,Yuezhong Meng
Polythiocarbonates (PTCs) represent a class of polymers derived from polycarbonates. While numerous synthetic methodologies have been reported, their practical applications remain unexplored. This study employs a one-pot bulk polymerization approach using propylene oxide (PO) and carbon disulfide (CS2) to synthesize polythiocarbonates, systematically investigating the effects of reaction temperature and duration on polymer properties. Results demonstrate that optimized reaction conditions fail to suppress O/S exchange, inevitably yielding polymers containing diverse thiocarbonate groups with varying stabilities. Consequently, we established the structural thermal stability hierarchy of thiocarbonate linkages: S(C═O)O > S(C═O)S > O(C═S)O > S(C═S)S > S(C═S)O. Density functional theory (DFT) calculations of bond dissociation energies (BDEs) corroborate this experimentally determined sequence. Our findings identify inherent structural instability as the fundamental barrier to polythiocarbonate applications, providing critical design principles for developing functionally stable PTCs.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Jinsong Wang,Huining Xiao,Haijiao Xie,Yang Huang,Farzad Seidi
Green self-healing coatings, particularly lignin-based coatings, represent a breakthrough solution for sustainable metal protection and serve as a promising alternative to traditional petroleum-derived coatings. However, the practical application of pure lignin coatings is limited by their inherent structural rigidity and low hydrophobicity. To address these challenges, a series of lignin-based hydrophobic self-healing coatings were developed by functionalizing lignin with methacrylate groups, conjugating it with corrosion inhibitors, and subsequently polymerizing it with bis(2-methylacrylyl) oxyethyldisulfide (BMOD) and hydrophobic monomers. Through a systematic optimization, we achieved a contact angle of 115° and an E corr of -20 mV for a coating with thickness ~ 19 μm. Notably, this coating reduces the corrosion rate (CR) by over 6000 times compared to bare steel. Additionally, the coating is able to restore its microcracks under mild conditions through a combination of the gradual release of corrosion inhibitors and reversible disulfide bonds, achieving a healing efficiency of 83.3 % within 72 h. The combination of excellent hydrophobicity, self-healing capability, and corrosion resistance represents a significant advancement in environmentally friendly, durable coatings with extensive industrial applications.
研究领域:
材料科学
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可持续化学
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产品关联
DOI
PubMed
高影响因子
ACS Polymers Au
·
2025
·
IF 6.9
Lian He,Wenbin Zhong,Shuanjin Wang,Sheng Huang,Dongmei Han,Min Xiao,Yuezhong Meng
Using 1,4-butanediol (BDO) as a chain transfer agent and a metal-free Lewis acid–base catalyst, polycarbonate macrodiols (PECDLs) with arbitrarily adjustable carbonate content were successfully synthesized via the direct copolymerization of ethylene oxide (EO) and carbon dioxide (CO2). The optimal reaction conditions were established through orthogonal experiments, and the effects of reaction pressure, reaction time, and reaction temperature on the copolymerization reaction were investigated. The molecular weight of the oligocarbonate diols can be conveniently and precisely controlled within the range of 1000–5000 g/mol, and the carbonate content can be controlled within 3–90%. PECDLs with a carbonate content lower than 70% exhibit significant water solubility. Due to the extremely low cost of carbon dioxide and epoxide, PECDLs with different compositions show extremely extensive attraction for many practical applications in the polyurethane industry, PVC environmentally friendly plasticizers, and novel biodegradable surfactants. This technology certainly triggers hot topics in both carbon dioxide utilization and biodegradable chemical feedstuffs.
研究领域:
高分子化学
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绿色化学
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二氧化碳利用
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可生物降解材料
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催化化学
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聚合物合成
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Ming Niu,Zhenghua Zhang,Rourou Wang,Yaxin Zhou,Jing Zhou,Lumei Pu,Weibing Xu
Research into antimicrobials is crucial for the sustainable development of the livestock industry. Trimethoprim (TMP) is one of the most widely used antimicrobial agents in the world. However, its efficacy is often limited by poor water solubility and dose-limiting properties. In this work, amphiphilic block polymer carriers are prepared using the oxygen-induced reversible addition–fragmentation chain transfer polymerization reaction. TMP is linked to carriers in different ratios to form poly(mPEG-b-PCEA)–TPM conjugates. The conjugates are characterized using various methods including 1H NMR, FT-IR, XRD and SEM. The results of in vitro antimicrobial experiments show that poly(mPEG-b-PCEA)–TMP with different ratios has more prominent antimicrobial effects than the same dosage of pure TMP. poly(mPEG-b-PCEA)–TMP80 shows the most significant results, inhibiting E. coli by 87.19% and S. aureus by 97.02%, with a hemolysis rate of <5% and good biocompatibility. In vivo pharmacokinetics show an increase in Cmax from 4.81 μg mL−1 to 6.57 μg mL−1 and AUC0–48 from 78.55 h μg mL−1 to 89.11 h μg mL−1 for poly(mPEG-b-PCEA)–TMP80 compared to commercially available TMP tablets. This strategy can effectively improve the antibacterial activity and pharmacokinetics and increase the bioavailability of TMP.
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Boru Zhang,Heng Li,Huitong Luo,Junpeng Zhao
Epichlorohydrin (ECH), a chloromethyl-carrying epoxide, is subject to alcohol-initiated ring-opening copolymerization with cyclic anhydrides using a mild phosphazene base ( t -BuP 1 ) or a Lewis pair comprising t -BuP 1 and triethylborane as an organic/metal-free catalyst. The products exhibit controlled molar mass and strictly alternating sequence distribution without ether linkages though ECH is added in excess. The single-component organobase catalyst favors elevated reaction temperature (60 °C) and leads to broad molar mass distribution, especially at a relatively high catalyst loading, due to the nucleophilic substitution (NS) of the ECH chloromethyl groups by the chain-end carboxylate. This side reaction suspends the propagation of some chains and generates chloride anions that can reinitiate the copolymerization, thus leads to low-molar-mass byproducts. Meanwhile, the epoxy-ended copolymers may undergo chain-end ring opening to form high-molar-mass byproducts. On the other hand, the two-component catalyst allows for a wider range of reaction temperature (25–60 °C) and higher copolymerization rate. NS can be significantly delayed at room temperature with optimized catalyst loading and composition, resulting in narrowly distributed molar mass, ranging from 2 to 30 kg mol −1 , at high or complete anhydride conversion. Interestingly, NS still occurs at the end of the copolymerization so that pendent- and end-group bifunctionalized polyester can be achieved in one synthetic step.
研究领域:
有机化学
·
高分子科学
✓ 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）