JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 35
·49026
·
IF 2.52
Gaofeng Zeng,Weiwei Zhang,Xin Zhang,Wenchao Zhang,Jianxin Du,Jiyu He,Rongjie Yang
A range of flame retardant vinyl ester resins (VERs) samples have been produced containing different contents of PEPA (1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclo[2.2.2]octane), APP (ammonium polyphosphate), and MoO 3 (molybdenum trioxide). By investigating the flame retardancy of VER samples such as limiting oxygen index and UL-94, the synergistic flame retardance of APP, PEPA, and MoO3 has been revealed. The cone calorimeter is an instrument that measures the combustion data of samples. In the VER composites on fire, the synergistic smoke suppression effect of the APP, PEPA, and MoO 3 was detected. The gas and condensed phase of VER composites with APP, PEPA, and MoO 3 were tested by the thermogravimetric analysis (TGA)–Fourier transform infrared spectroscopy (FTIR) and FTIR. The char residues of samples have been studied at length by scanning electron microscopy and FTIR. The results show that the presence of MoO3 can promote the formation of P O and PO structures.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 11
·3631-3643
·
IF 3.4
Lei Li,Yishen Chen,Xuejun Lai,Hongqiang Li,Xingrong Zeng
Phosphorus-nitrogen intumescent flame retardant (IFR) is one of the most promising halogen-free flame retardants in enhancing the fire safety of polypropylene (PP), but its efficiency needs to be further improved. Herein, a novel single-component polyphosphazene IFR containing pentaerythritol caged phosphate (PEPA) functionalized titanium carbide nanosheet (MXene), named PZS-MXene, was prepared. When the amount of PZS-MXene was 25 wt%, PP/PZS-MXene classed a UL-94 V-0 rating with the limiting oxygen index of 32.7%. Compared with PP, its peak of heat release rate, total heat release rate and total smoke production rate were reduced by 74.5%, 33.0%, and 19.8%, respectively. The flame-retardant mechanism revealed that PZS-MXene quenched high-active free radicals to inhibit the degradation of PP during the combustion. MXene rapidly catalyzed the carbonization of PZS to form high-quality intumescent char layer on its surface. Besides, MXene acted as the supporting skeletons and exerted the layered barrier effect to improve the compactness of the intumescent char layer, thus effectively inhibited the degradation and combustion of PP. This work provided new insights for the efficient halogen-free flame-retardant PP.
研究领域:
材料科学
·
阻燃材料
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 3
·1-17
·
IF 2.8
Chen Dongming,Li Ziwei,Li Dacheng,Li Shanrong,Mo Jing,Zheng Zijian,Lu Shaorong
In this study, a new type of compatibilizer, benzamide-grafted polyethylene polyamine (PEPA) containing solvent chain (PDABA-g-PEPA-O) was prepared from PEPA, 3,5-diaminobenzoic acid (DABA) and Oleoyl chloride (OC) and used to modify sisal microcrystalline cellulose (MCC). The natural rubber (NR) was filled with the modified MCC to prepare composites. The compatibilization effect of the prepared compatibilizer on the NR/MCC/PEPA-g-PDABA-O composites was investigated and its compatibilization mechanism was analyzed by molecular dynamics simulation (MD). The results show that adding 3wt% (calculated by MCC mass) PDABA-g-PEPA-O can improve the interfacial interaction between NR and MCC. The highest tensile strength of the NR composites was 25.319 MPa when 2.5phr MCC and 3wt% of PDABA-g-PEPA-O were added and is improved by 13.07% compared with that of NR/2.5phr MCC composites. In addition, the MD results showed that the amide and amine groups in the molecular structure of PDABA-g-PEPA-O formed a strong hydrogen bond and a strong van der Waals interaction with the hydroxyl groups of cellulose and PDABA-g-PEPA-O exhibited good compatibility with NR, which achieved the purpose of compatibilization. Moreover, the properties of tensile, deformation and shear resistance of the composites were enhanced with the addition of PDABA-g-PEPA-O in molecular simulation. The MD results provided a basis for the molecular design and preparation of compatibilizers and understanding their compatibilization mechanism in the polymer composites at a molecular level.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2026
·
IF 2.7
Xu Zhaohong,Li Jian,Tang Xiaodong
Pentaerythritol phosphate (PEPA) grafted TiO 2 and CNT were coated layer by layer onto the surface of carbon fibers to reinforce polyimide (PI) composites. The effect of PEPA grafted TiO 2 and CNT on the mechanical properties of CF/PI composites was studied by scanning electron microscope, contact angle measurement and X-ray photoelectron spectroscopy. The results show that PEPA grafted TiO 2 and CNT can significantly increase the surface activity and specific surface area of carbon fiber, and improve the wettability, reactivity and mechanical meshing between resin and carbon fiber. The interfacial properties and mechanical strength of the composites are improved. The interlaminar shear strength (ILSS) and flexural strength of PEPA grafted TiO 2 /CNT composite grafted carbon fiber composites were increased by 96.2% and 89.7%, respectively.
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Zhenting Yin,Wei Cai,Jingyi Lu,Bin Yu,Bibo Wang,Lei Song,Yuan Hu
With the advent of the 5G era, preparing conductive polymers to accomplish electromagnetic interference (EMI) shielding, mechanical enhancement, and flame retardancy are of vital importance. Graphite felt (GF) acts as a three-dimensional structure and organophosphorus derivatives containing different valences work as a flame retardant to form a novel EP composite. With GF incorporated into EP, EMI shielding effectiveness (SE) achieves around 60 dB, and absorption is dominated in the X band (8.2–12.4 GHz). Meanwhile, GF could exert a fiber reinforcement effect to enhance the mechanical properties of EP composites, tensile strength and impact strength of EP/GF are increased by 19.1% and 64.2%, respectively. However, owing to the “wick effect” of GF, 20 wt% DOPO-PEPA is added to acquire flame-retardant EP composites. Herein, a potential strategy broadens applications of EP composites in the high-end field and is provided to prepare polymer composites .
研究领域:
材料科学
·
电气工程
·
复合材料
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Guo-Min Yu,Li-Sheng Wang,Chao-Jun Du
A phosphorus flame retardant of 4-(hydroxymethyl)-1-oxido-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane (PEPA) was synthesized by pentaerythritol and phosphorus oxychloride at a certain condition. The structural features of PEPA were investigated with Fourier transform infrared spectroscopy and 1H NMR methods. The thermal behavior of PEPA was carried out with differential scanning calorimetry and thermogravimetric analysis instruments. A static analytic method was used to measure the solubilities of the PEPA in several organic solvents. The measurements were accurately acted in ethyl acetate, acetonitrile, isopropyl alcohol, ethanol, n-propyl alcohol, acetone, methanol, and chloroform at the temperature range from 292.75 K to 333.45 K. Using the Scatchard–Hildebrand methodology, the activity coefficients of the solute have been calculated, and the partial molar excess enthalpies at infinite dilution were also predicted.
研究领域:
化学
·
材料科学
·
物理化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Renjie Chen,Xinyu Huang,Ruizhi Zheng,Delong Xie,Yi Mei,Ruqiang Zou
Organic phase change materials are flammable, which limits their applications in heat storage and conversion. In the presented study, a phosphorus-grafted hexadecanol was blended with pentaerythritol phosphate (PEPA) to prepare flame-retardant phase change material (FRPCM). The thermal properties of FRPCM were evaluated by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and cone calorimetry. The flame-retardant mechanism was examined by thermogravimetric analysis-Fourier transform infrared spectrometry (TG-FTIR) and scanning electron microscopy (SEM) tests. The FRPCM maintains a promising heat storage capacity (186.9 J/g) and thermal stability after grafting and blending. The flame retardance analysis reveals that the grafted phosphorus group helps to promote char formation. PEPA extends the time before exposed combustible material ignites. The cone calorimeter test demonstrated that the peak heat release rate and total heat release are further decreased by more than 50%, owing to the synergistic effect between the phosphorus group and PEPA. The SEM results showed that a porous structure is formed during combustion. Self-extinguishment testing indicates that the FRPCM is extinguished in a much shorter time than is hexadecanol.
研究领域:
材料科学
·
热能工程
·
能源存储
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2026
·
IF 8.2
Xiao Shi,Honghao Jiao,Boxiao Zhao,Zhongjun Li,Haibiao Yu,Junshuo Cui,Ying Xiong
Carbon nanotubes (CNT) have a strong tendency to aggregate, which seriously affects the doping homogeneity in the preparation of CNT-based composites. Using dispersant is essential for dispersing CNT, however, conventional dispersants typically suffer low efficiency. Herein, a cationic perylene bisimide (CPBI)-based dispersant, which featured with a large conjugated center, is synthesized. Owing to the strong π-π interaction between the conjugated center of CPBI and CNT, and the hydrophilic multiple protonated N atoms, the dispersant shows excellent performance for stabilizing CNT in water. Ultra-high concentration CNT dispersion (40 mg mL −1 ) is achieved by tip-sonication with the assistance of CPBI at a weight ratio of 1:1 (CPBI-to-CNT), which is superior to most of that reported previously. Remarkably, CNT dispersion is maintained even at a CPBI-to-CNT weight ratio of 1:3. The homogeneity and stability of the dispersion is systematically characterized by dynamic light scattering (DLS), Tyndall effect, scanning electron microscopy (SEM), and zeta potential test. The dispersion also exhibits film-forming properties and has been successfully used to prepare solvent-resistant and conductive CNT coatings (128.7 S/m). In addition, CNTs are dopped into PVA matrix, effectively enhance the tensile strength for about 102 % at a PVA-to-CNT weight ratio of 100:3.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Mingshan Jiang,Chengfu Han,Zhongyang Cao,Yi Zhao,Xinxin Zhao,Kangkang Zhou,Wei Zhai,Guoqiang Zheng,Xiaobo Zhu,Pengbo Wan,Kun Dai,Chuntai Liu,Changyu Shen
Flexible wearable electronic devices based on conductive hydrogels have attracted considerable attention in recent years. However, there still remains a huge challenge to achieve a balance between the mutually exclusive sensing performance of stretchable conductive hydrogels. Inspired by the slit organs of spiders, a microcrack-structured visualizable hydrogel sensor (MVHS) based on Ti 3 C 2 T x (MXene)/carbon nanotube (CNT) synergistic interaction is developed. Benefiting from the strain-dependent microcrack structure design and the incorporation of fluorescent nitrogen-doped carbon quantum dots (N-CQDs), the MVHS possesses tunable mechanoluminescence (ML) properties and outstanding sensing performances including low detection limit (0.2% strain), exceptional sensitivity (gauge factor, GF = 10.92), large strain detection range (up to 2050%), as well as outstanding stability. Meanwhile, the strong hydrogen bonding between glycerol and water molecules imparts the MVHS with remarkable water retention and anti-freezing capabilities, significantly broadening its operational temperature range. Additionally, the MVHS can be employed as a stretchable flexible electrode for fabricating high-performance soft triboelectric nanogenerator (TENG). When combined with advanced machine learning algorithms, the sensor enables accurate handwriting recognition, demonstrating significant potential for applications in intelligent human–machine communication.
研究领域:
材料科学
·
柔性电子学
·
传感器
·
纳米技术
·
机器学习
·
人机交互
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Sheng Zhao,Feng Feng,Yuanting Chen,Xiaoyang Huang,Zhenzhen Wang,Chenfang Miao,Shaohuang Weng,Mingrui Lin
Minocycline (MC), a widely used broad-spectrum antibiotic in both clinical practice and the food industry, exhibits remarkable efficacy alongside notable adverse effects. Consequently, the development of a straightforward yet efficient detection strategy for MC in medical science and food industry assumes paramount importance to avoid its misuse and accumulation. Herein, fluorine-doped carbon dots (F-CDs) with favorable optical properties were designed and synthesized via a hydrothermal procedure using tetrafluorophthalic acid and polyethylene polyamine as raw materials. It was observed that MC quenched the fluorescence of F-CDs through the mechanism of static quenching and inner filter effects. When the concentrations of MC (C MC ) were in the range of 0.5–25 μg/mL, there was a good linear relationship between C MC and the fluorescence quenching efficiency (QE, calculated as (F 0 F)/F 0 ) with the equation of Y = 0.025*C MC + 0.012 and the detection limit of 0.24 μg/mL ( n = 8). Furthermore, this method demonstrated high sensitivity, simplicity, and rapidity in determining the percentage label content of minocycline hydrochloride capsules, as well as the recovery of MC in human serum samples and dairy products. The excellent analytical performance of this method underscores its promising potential for drug concentration monitoring, clinical blood drug concentration assessments, and food safety control. The findings highlight the importance and potential of this strategy in ensuring strict quality control of MC in various applications.
研究领域:
分析化学
·
纳米技术
·
药物分析
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食品科学
·
生物医学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zexian Chen,Yaojie Zhang,Wenjuan Dong,Yang Liu,Li Zhang,Yueping Dong,Zihan Wang,Yihong Chen,Qin Hu,Chuan Dong,Xiaojuan Gong
Lignin-derived carbon dots (L-CDs) were synthesized via a simple one-step hydrothermal method using sodium lignosulfonate and polyethylene polyamine as carbon and nitrogen sources, respectively. The obtained L-CDs exhibited strong blue fluorescence, which was effectively quenched by Co(II) and VB 12 through an inner filter effect (IFE), accompanied by distinct color changes under both visible and ultraviolet light. Taking advantage of this property, a smartphone-assisted visual sensing strategy was developed for the rapid and portable detection of Co(II) and VB 12 with high selectivity and sensitivity. The detection limits were as low as 0.17 μM for Co(II) and 0.03 μM for VB 12 . Furthermore, the proposed sensing platform was successfully applied to the determination of Co(II) in environmental water samples and VB 12 in pharmaceutical formulations. This work not only demonstrates a novel design of carbon dot-based dual-mode sensors but also highlights the value-added utilization of lignin in analytical applications.
研究领域:
分析化学
·
环境监测
·
药物分析
·
纳米生物技术
·
传感器开发
·
食品安全
·
转化医学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 5
·1006
·
IF 4.2
Xia Wang,Wulan Zeng,Peidan Hu,Shengxin Liu,Yuechao Lin,Zhaowen He,Chunling Xin,Xiangjun Kong,Jinghan Xu
Organic amine-modified mesoporous carriers are considered potential CO2sorbents, in which the CO2adsorption performance was limited by the agglomeration and volatility of liquid amines. In this study, four additives of ether compounds were separately coimpregnated with polyethylene polyamine (PEPA) into MCM-41 to prepare the composite chemisorbents for CO2adsorption. The textural pore properties, surface functional groups and elemental contents of N for MCM-41 before and after functionalization were characterized; the effects of the type and amount of additives, adsorption temperature and influent velocity on CO2adsorption were investigated; the amine efficiency was calculated; and the adsorption kinetics and regeneration for the optimized sorbent were studied. For 40 wt.% PEPA-loaded MCM-41, the CO2adsorption capacity and amine efficiency at 60 °C were 1.34 mmol/g and 0.18 mol CO2/mol N, when the influent velocity of the simulated flue gas was 30 mL/min, which reached 1.81 mmol/g and 0.23 mol CO2/mol N after coimpregnating 10 wt.% of 2-propoxyethanol (1E). The maximum adsorption capacity of 2.16 mmol/g appeared when the influent velocity of the simulated flue gas was 20 mL/min. In addition, the additive of 1E improved the regeneration and kinetics of PEPA-loaded MCM-41, and the CO2adsorption process showed multiple adsorption routes.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
PubMed
高影响因子
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