IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 6
·729-737
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IF 3.1
Wang Meng,Li Xiaodong,Li Shaolong,Li Wenke,Stewart Callum,Yang Yike,Liu Feng
Abstract The interfacial de-wetting problem of fluoropolymer/nitramine energetic composites such as F2313/RDX severely restricts their potentially extensive application as high-energy polymer bonded explosives (PBXs). The matched neutral polymeric bonding agents (NPBAs) can bridge the gap between the composite components and play a critical role in strengthening the composite interface to inhibit de-wetting. In this contribution, following the typical NBPA design strategy, two novel NPBAs with trifluoromethyl and amino pendants were prepared from methyl acrylate (MA), hydroxyethyl acrylate (HEA), trifluoroethyl methacrylate (TFEMA) and acrylamide (AM) as raw materials, under the action of initiator AIBN, named NPBA-2 and NPBA-3, respectively. The structure, interfacial characteristics, and bonding properties of the synthesized NPBAs were investigated. The results showed that the additional functional groups reduced the surface tension for interface wetting and effectively enhanced the bonding effect of NPBAs on F2313/RDX according to the “like-dissolves-like” rule and the formation of hydrogen bonds. The bonding properties of both novel NPBAs out-performed the control NPBA-1 and provided at least 184% interfacial reinforcement for F2313/RDX. The NPBA-2 bonded F2313/RDX energetic composite exhibited the best mechanical properties with a maximum Brazilian strength of 6.88 ± 0.02 MPa and the corresponding modulus of 10.71 ± 0.02 GPa. We believe that these NPBAs will have great application potential in high-energy PBXs. Graphical abstract
研究领域:
材料科学
·
爆炸物工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Dongling Yang,Hongyuan Sha,Zujian Wang,Rongbing Su,Chao He,Bin Su,Xiaoming Yang,Xifa Long
Non-centrosymmetric organics are promising nonlinear optical (NLO) candidates, which always exhibit a short UV absorption cutoff edge, and a strong second harmonic generation (SHG) response, but an overlarge birefringence. Here, in order to optimize the birefringence, the methyl modulation of π-conjugated organic planar units is proposed and implemented with the urea structure as a template. Thus, N -methylurea and N,N' -dimethylurea crystals are obtained by partially replacing hydrogen atoms with methyl groups. This replacement reduces hydrogen donors and weakens interchain hydrogen bonds, which facilitates the decreasing density and the parallel arrangement of π-conjugated planar units. Hence, both N -methylurea and N,N' -dimethylurea crystals exhibit not only an optimized birefringence ( N -methylurea ≈0.099 and N,N' -dimethylurea ≈0.072 at 546 nm) but also an enhanced SHG response ( N -methylurea ≈1.2 × β -BaB 2 O 4 and N,N' -dimethylurea ≈1.9 × β -BaB 2 O 4 ), while maintaining a short UV absorption cutoff edge. Therefore, this work provides a novel strategy for the structural design and performance modulation of organic NLO crystals.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2017
·
IF 3.531
Agnieszka Rojewska,Anna Karewicz,Karolina Boczkaja,Karol Wolski,Mariusz Kępczyński,Szczepan Zapotoczny,Maria Nowakowska
Novel system based on bionanocellulose modified with carboxymethyl groups (mBNC) and covalently attached hydrogel submicron particles with encapsulated curcumin was prepared and its usefulness for the preparation of bioactive wound dressing materials was demonstrated. In order to obtain a well-controlled delivery system, curcumin was first encapsulated in Pluronic ® P103 micelles and subsequently entrapped in the particles prepared by the extrusion method using commercially available, relatively inexpensive and biocompatible polymers: sodium alginate (ALG) and hydroxypropyl cellulose (HPC). The size of the particles and the feed ratio of curcumin and ALG were optimized during the synthesis in respect with the curcumin loading and release profile. The particles were coated with chitosan and successfully immobilized on the surface of mBNC using EDC/NHC chemistry. The particles attached to the mBNC surface released the curcumin in a sustain, well controlled manner, resembling that of the unbounded particles. Their presence allows for prolonged bioactivity of the potential wound dressing material.
研究领域:
材料科学
·
生物医药
·
伤口愈合
✓ 已验证
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Wenhui Li,Hua Dong,Kejing Niu,Huan-Yu Wang,Wenqian Cheng,Hualong Song,An-Kang Ying,Xiaobing Zhai,Kefeng Li,Huijuan Yu,Dong-Sheng Guo,Yuefei Wang
The prevalence of metabolic disorders has been found to increase concomitantly with alternations in habitual diet and lifestyle, indicating the importance of metabolic health monitoring for early warning of high-risk status and suggest effective intervention strategies. Hippuric acid (HA), as one of the most abundant metabolites from the gut microbiota, holds potential as a regulator of metabolic health. Accordingly, it is imperative to establish an efficient, sensitive, and affordable method for large-scale population monitoring, revealing the association between HA level and metabolic disorders. Upon systematic screening of macrocycle•dye reporter pair, a supramolecular architecture (guanidinomethyl-modified calix [5] arene, GMC5A) was employed to sense urinary HA by employing fluorescein (Fl), whose complexation behavior was demonstrated by theoretical calculations, accomplishing quantification of HA in urine from 249 volunteers in the range of 0.10 mM and 10.93 mM. Excitedly, by restricted cubic spline, urinary HA concentration was found to have a significantly negative correlation with the risk of metabolic disorders when it exceeded 0.76 mM, suggesting the importance of dietary habits, especially the consumption of fruits, coffee, and tea, which was unveiled from a simple questionnaire survey. In this study, we accomplished a high throughput and sensitive detection of urinary HA based on supramolecular sensing with the GMC5A•Fl reporter pair, which sheds light on the rapid quantification of urinary HA as an indicator of metabolic health status and early intervention by balancing the daily diet.
研究领域:
分析化学
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代谢组学
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健康监测
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超分子化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chenchen Song,Yake Luo,Juan Zheng,Wenfen Zhang,Ajuan Yu,Shusheng Zhang,Gangfeng Ouyang
Owing to the excessive usage of benzoylurea insecticide (BUs), ecological and environmental problem has been attracted increasing public attention. Herein, a novel trifluoromethyl-grafted covalent organic framework (COF), named COF-(CF 3 ) 2 , was synthetized through Suzuki-Miyaura cross-coupling reaction based on post-synthetic modification (PSM) strategy under mild condition. The synthesized operation was simplified to make it suitable for large-scale production and application. Characterization methods, such as fourier transform-infrared spectrum, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, were implemented to confirm the successful synthesis of COF-(CF 3 ) 2 . Considering the enhanced electrostatic interaction and fluorine–fluorine interactions, COF-(CF 3 ) 2 was applied as solid phase microextraction (SPME) coating. An analytical method coupling direct immersion (DI)-SPME with ultra-high performance liquid chromatography-tandem mass spectrometrywas established for effective enrichment and ultrasensitive determination of seven BUs in environmental water. Satisfactory analytical parameters for target BUs were obtained, including wide linearity of 1–1000 ng L −1 with correlation coefficient (R 2 ) of 0.9991–0.9999, low limits of detection (LOD) of 0.06–0.50 ng L −1 , high enrichment factors (EFs) of 44–105 and satisfactory precision with relative standard deviations (RSD) ≤ 10.2%. The excellent performance of the proposed method was validated by the recovery test in real water samples with recoveries of 76.2–107.6% and RSD ≤ 11.1%. Furthermore, multiple interactions between COF-(CF 3 ) 2 and BUs molecules were analyzed combined with theoretical simulations to explain the adsorption mechanism. It illustrated that exceptional BUs adsorption performance of COF-(CF 3 ) 2 might be attributed to synergistic effect of mesoporous structure and trifluoromethyl modification. This work represents a rational design of functional materials through a novel and versatile PSM approach for the effective enrichment and ultrasensitive analysis of BUs in environmental water, and provides a multiscale understanding of high-performance adsorbent.
研究领域:
环境科学
·
分析化学
✓ 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）