POLYMER COMPOSITES
·
2024
·Vol. 45
·期 18
·17205-17221
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IF 4.8
Shun Yang,Ying Wei,Hongfeng Yin,Dawei Li,Feibiao Xue
Interfacial adhesion properties are a key factor affecting the mechanical properties of composites. It is a very effective way to improve the low-velocity impact resistance of composites by improving the interfacial adhesion properties. To improve the fiber/matrix interfacial adhesion properties of GF/PA6 (glass-fiber/polyamide 6) composites, polyethyleneimine (PEI) and γ-aminopropyltriethoxysilane (KH550) were used to co-modify GF together in this study. The GF/PA6 composites with different modifications of glass-fiber (GF) were also prepared using a hot pressing process, and then their flexural strength, shear strength, pendulum impact strength, and low-speed impact resistance were investigated. Next, the relationship between fiber/matrix interfacial adhesion and mechanical properties of GF/PA6 composites was investigated by combining x-ray photoelectron spectroscopy, scanning electron microscopy, and x-ray computed tomography test results. The results showed that the GF-reinforced PA6 matrix composite with co-modified GF by PEI and KH550 (PEI-KH550-GF/PA6) had the best mechanical properties, with flexural, shear, and pendulum impact strengths of 660.7 MPa, 53.1 MPa, and 261.6 kJ/m 2 , respectively. Furthermore, the low-velocity impact resistance was measured in terms of stress peak, absorbed energy, residual stress, and damage extension, and the results showed that the low-speed impact resistance of PEI-KH550-GF/PA6 composites was also substantially improved that the F max increased from 7402.1 to 10414.0 N. Highlights Due to the poor surface activity of GF, in this experiment, GF was co-modified with PEI and KH550 to achieve better fiber/matrix interfacial adhesion and successfully improve the mechanical properties of the composites; Different modification methods are used to improve the interfacial adhesion of the fiber/matrix interface. The relationship between the interface and impact strength of composites has been studied; The relationship between fiber/matrix interfacial adhesion and internal cracking in composites was investigated using X-CT and SEM and other test results.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yanyan Li,Yikang Wang,Li Cui,Lie Zhao,Youyi Tian,Jiajia Shen,Junfeng Zhang,Huawei Xu,Meifang Zhu
Achieving favorable flame retardancy in polyamide 6 (PA6) without compromising its mechanical performance remains a challenge, with a notable gap in understanding the influence of flame-retardant structure on PA6 properties and mechanisms. In this study, two biomass-derived phosphonamide flame retardants, P,P-diphenyl-N-(pyridin-3-yl) phosphonamide (DPDA) and P,P-Diphenoxy-N-(pyridin-3-yl) phosphonamide (DPPA), were synthesized and incorporated into PA6 to develop flame retardant composites. Results demonstrated that the PA6-9DPDA, containing a P-C bond, achieved a UL-94 V-0 rating with a Limiting Oxygen Index (LOI) of 27.9 %, while PA6-9DPPA, containing a P-O-C bond, maintained the UL-94 V-2 rating of pure PA6 but with an increased LOI of 29.4 %. DPPA exhibited a more favorable impact than DPDA on enhancing the tensile performance of PA6. Mechanisms indicated that DPDA primarily operates through vapor phase flame retardancy, whereas DPPA utilizes condensed phase flame retardancy. Overall, this study proposes a sustainable approach for fabricating PA6 composites with enhanced comprehensive performance.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 44
·18890-18899
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IF 2.7
Xuyan Xue,Changshuai Gong,Sihan Yang,Jian He,Meiting Li,Xuejiao Wang
Non-contact optical temperature measurement has attracted intense attention in recent years due to its advantages of high speed and high safety. In this work, a Lu2WO6:Er3+ phosphor was successfully prepared by a solid state reaction. The effective energy transfer from the [WO6]6− group to Er3+ was proved using the emission spectra and fluorescence lifetime measurements, with an estimated transfer efficiency of 51%. Benefiting from the self-luminescence of the [WO6]6− group, optical thermometry was established based on the fluorescence intensity ratio of [WO6]6− emission to Er3+ emission. Remarkably, strong emission color variability from blue to green was observed under 320 nm UV excitation as the temperature increases from 298 K to 548 K, while an opposite trend from green to cyan is observed under 378 nm UV excitation. The maximum relative sensitivity (SR Max) is 3.37% K−1 (298 K), which is highly superior to most of the previously reported values.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2024
·
IF 3
Ma Licheng,Qi Jungang,Gao Leqi,Wei Tao,Guo Yanhua
In this study, a cesium ion imprinted polymer (Cs(I)-IIP) was prepared by free radical thermal polymerization using 18-crown-6-ether (18C6) as ligand, methacrylic acid (MAA) as functional monomer, and ethylene glycol dimethacrylate (EGDMA) as crosslinking agent, which can be used for adsorption and separation of cesium ions from low-concentration solutions. The adsorption kinetic and isotherm results showed that the adsorption of Cs + fitted to the pseudo-second-order kinetic model and Langmuir model, indicating that the adsorption of Cs + on Cs(I)-IIP was the monolayer chemical adsorption. The maximum adsorption capacity was 84.21 mg·g − 1 . The selective adsorption properties are performed in Cs + , Li + , Na + , and K + multicomponent systems. The results showed that the Cs(I)-IIP has a high selectivity in the presence of coexisting Li + , Na + , and K + , and the selectivity coefficients ( K’ ) of Cs(I)-IIP for Cs + /Li + , Cs + /Na + , Cs + /K + are 2.1, 1.56, and 1.33, respectively. The high adsorption capacity and selectivity are attributed to the introduction of imprinting technology to form specific Cs + recognition adsorption sites, and the 18C6 cavity was easier to recognize Cs + in the competitive adsorption process. Finally, the Cs(I)-IIP can be regenerated and reused for 10 times with the adsorption capacity only decreased by 8.1%, indicating that the polymer has good reuse performance.
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POLYMER DEGRADATION AND STABILITY
·
2011
·
IF 2.594
Jun Chen,Shumei Liu,Jianqing Zhao
A novel flame retardant containing silicon and caged bicyclic phosphate groups, tri(2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane-1-oxo-4-hydroxymethyl) phenylsilane (TPPSi) was successfully synthesized. The chemical structure of TPPSi was characterized by FTIR, 1 H NMR and 31 P NMR. The application of TPPSi (25 wt%) as a flame retardant in polyamide 6 (PA6) not only gains satisfied flame retardancy and smoke suppression, but also retains the high toughness and inherent appearance of pure PA6. The influence of TPPSi on the decomposition pathway of PA6 was discussed based on TG–FTIR and FTIR analysis. The interaction between TPPSi and PA6 at high temperature alters the decomposition pathway of PA6 resulting in the formation of the residue containing phosphorus and silicon. The heat and smoke release behaviors at different external heat fluxes were measured by cone calorimeter, and the fire residue was analyzed by SEM–EDX. The condensed phase action resulting from the barrier effect of residue is proposed to be the major flame retardancy mechanism of TPPSi in PA6, with the fuel reduction action as the minor.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Ruiqi Huang,Yingfeng Qin,Yanqin Huang,Zengqiong Huang,Gao-Jie Ye
6-mercaptopurine (6-MP) is widely used in the treatment of many diseases, but exhibits some serious side effects due to its toxicity. Therefore, it is important and imperative to effectively control and monitoring concentration of 6-MP. Herein, we designed a smartphone-assisted colorimetric sensing platform for 6-MP detection, based on an excellent β-cyclodextrin modified MnO 2 nanosheets (β-CD@MnO 2 NNS) mediated oxidase-like activity. β-CD@MnO 2 NNS can directly oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidized TMB with color changes, yielding more than 3-fold higher oxidase-like catalytic activity compared with individual MnO 2 NNS. After adding 6-MP, β-CD@MnO 2 NNS can be reduced to Mn 2+ and lose their oxidase-like properties, resulting in a color and absorbance change for sensitive and selectivity detection of 6-MP. Meanwhile, the smartphone-based color recognition application can intuitively and simply measure the concentration of 6-MP. The limits of detection UV–vis instrument and smartphone were 0.35 μM and 0.86 μM, respectively. This method has also been successfully applied to the detection of real samples. Finally, this study provides a new promising platform for detection of 6-MP and is expected to be used in application of pharmaceutical analysis and biomedicine.
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PubMed
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2025
·Vol. 651
·期 3
·e202400210
·
IF 1.1
Ziyue Zhang,Zhuoer Cai,Yinan Zhang,Jian Chen,Xiu-Ni Hua,Baiwang Sun
The focus of this study is on the development of novel host–guest inclusion compounds, which is a crucial molecule model for the synthesis of dielectric phase transition materials. In this research, a new host–guest inclusion compound is successfully synthesized by selecting 18-crown-6 as the host and 3-aminocyclobutanone as the guest molecule. The thermal behavior and crystal structure of the compound are analyzed in this article. It is found that the compound exhibits a reversible phase transition near 147 K, accompanied by a dielectric anomaly, exhibiting dielectric switching characteristics. The 18-crown-6 molecule and the 3-aminocyclobutanone molecule are connected via hydrogen bonding. Furthermore, the enthalpy changes of the heating process and cooling process are also calculated. This finding is expected to yield valuable new insights into the design of host–guest inclusions.
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Materials
·
2024
·Vol. 17
·期 23
·5852
·
IF 3.1
Qiang Xu,Jiayi Dong,Guiqin Yan,Rongnan Yi,Xiaojing Yang
With cellulose as the precursor and ethylenediamine as the N source, N-doped graphene quantum dots (N-GQDs) were synthesized by a simple and feasible one-pot hydrothermal method. The whole process did noSchemet need a strong acid or strong base and avoided interference from inorganic salt residues. The whole process lasted only 3 h and avoided any complex postprocessing. Because of the outstanding optical properties of N-GQDs, a high-efficiency 6-mercaptopurine fluorescent probe based on the inner filter effect of fluorescence was established. The detection range was 0.2–60 μM and the detection limit was 0.05 μM. This method can preliminarily detect 6-mercaptopurine in human urine and avoids any sample preparation or extraction in advance and brings satisfactory results.
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Journal of Ginseng Research
·
2025
·
IF 5.6
Weimin Wang,Kaixuan Zhou,Zengshuai Fu,Yucheng Huang,Jianjun Deng,Daidi Fan,Haixia Yang
Background Alcohol-induced liver injury contributes to various liver diseases, with dietary interventions of ginsenosides being a promising solution. Ginsenosides, the major active compounds of Panax ginseng Meyer , are divided into protopanaxadiol (PPD) and protopanaxatriol (PPT) based on C-3 or C-6 glycosylation, which have anti-inflammatory and antioxidant effects, but structure-activity relationships remain unclear. Methods Using C57BL/C mice with alcohol-induced liver injury, we evaluated Rg5 and F4 effects on liver function, inflammation, lipid deposition, apoptosis, alcohol metabolism, and lipid synthesis. Results Rg5 (60 mg/kg) demonstrated significantly superior efficacy to F4 in alleviating alcohol-induced liver injury, reducing lipid deposition through 33.9% and 25.8% decreases in serum triglyceride (TG) and total cholesterol (TC) levels versus the F4 group. Additionally, Rg5 attenuated hepatic apoptosis by reducing BAX and cleaved-CASPASE-3 protein expression by 26.3% and 28.4% compared to F4. Rg5 enhanced alcohol metabolism through activation of alcohol dehydrogenase (ADH) and acetaldehyde dehydrogenase (ALDH), thereby restoring AMP-activated protein kinase (AMPK) phosphorylation by 26.1% while reducing sterol regulatory element-binding protein 1 (SREBP-1) expression by 27.8% (compared to F4), with efficacy approaching that of positive control silymarin. Molecular docking revealed that the C-6 sugar moiety of F4 induced hydrogen bond donor repulsion, increasing hydrogen bond length and weakening binding stability with ADH, ALDH and AMPK, providing a structural basis for Rg5's superior hepatoprotective activity. Conclusion These findings highlight the critical influence of glycosylation position on hepatoprotective activity of ginsenosides, and provide insights into the structural modification of ginsenosides, which could contribute to the treatment of alcohol-related liver disease.
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Food Bioscience
·
2024
·
IF 4.8
Hongtao Zhu,Zhi-Jing Ni,Qian Zhong,Wei Wang,Ya-Jing An,Kiran Thakur,Jian-Guo Zhang,Zhong-Li Chen,Zhao-Jun Wei
The bio-functional activities of sericin, a silk protein, have been explored across various fields, underscoring its potential therapeutic applications due to anti-inflammatory, antioxidant, and wound-healing effects. Sericin has also been shown to ameliorate ulcerative colitis (UC). While previous studies have noted the effects of intact sericin on ameliorating UC to some extent, there remains a significant gap in understanding the mechanism of action of small molecule sericin peptide (SRP). In this study, we explored the therapeutic efficacy of SRP in a dextran sulfate sodium (DSS)-induced mouse model of UC. Various oral doses of SRP were administered, and their effects were assessed through a range of physiological and biochemical parameters associated with UC. Our findings demonstrated that SRP effectively alleviated UC symptoms, as evidenced by improved physiological indices and reduced inflammatory markers. Additionally, transcriptomic and proteomic analyses revealed that the beneficial effects of SRP on UC were linked to the regulation of key biological pathways, particularly those involved in Th17 cell differentiation. To further validate our data, Western-blot, and immunofluorescence assays verified that SRP modulates Th17 cell differentiation, alleviating inflammation and maintaining homeostasis within the colonic vascular environment. Furthermore, SRP treatment was shown to protect colonic mucosal function, contributing to the overall improvement in UC symptoms. By regulating Th17 cell differentiation and modulating inflammatory pathways, SRP presents a promising approach to managing UC and enhancing mucosal health.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zongsheng Liu,Baoli Huang,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
Polyamide 6 (PA6) is an eminent engineering plastic renowned for its exceptional mechanical attributes, yet its flammability restricts its application scope. Aluminum diethylphosphinate (ADP) has exhibited an ability to significantly reduce the flammability of PA6, yet it is incapable of enhancing the char-forming capacity of PA6. More importantly, ADP causes serious damage to the mechanical properties of PA6. Here, a boron-containing polymer (PDBD) was prepared and added to PA6 together with ADP to prepare flame-retardant PA6 composites. Compared with PA6/13ADP, the PA6/10ADP/3PDBD sample with 3 wt % PDBD replacing the ADP not only can pass a UL-94 V-0 rating, but also, the peak of heat release rate (PHRR) and the total heat release (THR) were reduced by 35.6% and 16.5%, respectively. Simultaneously, the incorporation of PDBD significantly enhanced the char-forming potential of PA6, signifying a robust synergism between PDBD and ADP in catalyzing and facilitating the char-forming procedure of PA6. Significantly, compared to those of PA6/13ADP, the elongation at break and notch impact strengths of PA6/10ADP/3PDBD composites are notably increased by 174.3% and 45.8% due to the robust hydrogen bond between PDBD and PA6. These results illustrate that PDBD can effectively augment the charring propensity of PA6/ADP and mitigate the detrimental effects of ADP on the mechanical properties of PA6. Therefore, this work provides a simple and feasible method for preparing high-performance PA6 composites.
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Journal of Energy Storage
·
2025
·
IF 9.8
Huan-Huan Liu,Rui-Yue Qi,Dong Xiang,Guo-Xian Yu,Hai-Feng Li,Jing Xiang
A stable 6-coordinate Fe III compound K[Fe III (THEED)] (H 4 THEED = N,N,N′,N′ -tetrakis(2-hydroxyethyl)ethylenediamine) was used as the anodic active material for all‑iron alkaline redox flow battery (ARFB), which shows a redox potential of E 1/2 = −0.93 V ( vs. Ag/AgCl). When it was paired with K 4 [Fe(CN) 6 ] as the cathodic counterpart, it gives a cell voltage of ∼1.3 V. Fe(THEED) exhibits the enhanced resistance to metallic iron deposition as compared with the 5-coordinate Fe-triethanolamine complex Fe(TEOA), mainly attributed to its saturated 6-coordinate structure with a large stabilization constant that effectively inhibits various side reactions. The cell performance of ARFB can be significantly improved by using Fe(THEED) as the negative active material. The ARFB containing 0.5 M Fe(THEED) and Fe(CN) 6 electrolytes demonstrated a discharge capacity of 14.59 Ah L −1 at a current density of 80 mA cm −2 , with a coulombic efficiency (CE) of 99.8 %, and an energy efficiency (EE) of 79.9 %. The peak power density can reach 194 mW cm −2 at a current density of 240 mA cm −2 . The system can exhibit exceptional cycling stability with 99.9 % capacity retention over 100 cycles (∼36 h). The low cost of Fe-THEED and Fe(CN) 6 components increases the economic viability, as compared to conventional V-based and previously reported Fe-based systems.
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