POLYMER
·
2025
·
IF 4.5
Lili Li,Yuzhe Li,Yulong Wang,Shuang Han,Jiangxu Li,Junguo Gao
As a new-generation cable insulation material, polypropylene (PP) has received much attention and replaced crosslinked polyethylene. However, the space charge accumulation under high fields still needs to be improved to ensure the safe operation of high-voltage direct current (HVDC) cables. Here, PP was chemically grafted with propenoxy-2-hydroxybenzophenone (AHB) to form PP-g-AHB, and ethylene tetrafluoroethylene copolymer (ETFE) was chemically grafted with glycerol (GL) to obtain ETFE-g-GL. Then PP/ETFE co-crystalline supramolecules were prepared via melt blending. The effect of hydrogen bonds on the space charge inhibition of PP/ETFE co-crystalline supramolecules was investigated using molecular dynamics simulation of differential charge density, energy band, and trap energy level combined with microstructure characterization. Simulations and experiments show that PP-g-AHB and ETFE-g-GL can form PP/ETFE co-crystalline supramolecules very well, owing to the existence of hydrogen bonds. When the mass fraction of PP-g-AHB is 80 %, the cocrystallization size of PP/ETFE supramolecules maximizes to 390 ± 10 μm. Under the action of direct current source, the carrier mobility of PP/ETFE co-crystalline supramolecules is as low as 7.94 × 10 −13 m 2 /(V.s), and the space charge is dominated by heteropolarity, when the average charge density minimizes to 0.08 C/m 3 . So far, the charge transport characteristics of PP/ETFE co-crystalline supramoleculars have been significantly improved using hydrogen bonds as a bridge. This study lays a foundation for the application of PP in HVDC cable insulation.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiawei Wei,Ruru Liu,Fang Wang,Xiangying Chen,Zhongjie Zhang
In present work, citric acid was used as a cross-linking agent to perform surface hydrophobization of magnesium oxysulfate (MOS) whiskers and bamboo flour (BF), producing PP/MOS/BF ternary composites via melt extrusion and injection molding processes. The results show that MOS increase the crystallization temperature, melting temperature, and degree of crystallinity of the composites, acting as heterogeneous nucleation agents. BF inhibits the crystallization process of PP, but when compounded with MOS, it enhances the crystallization performance of the ternary composites, leading to an increase in crystallinity. Additionally, the rigidity of MOS and the flexibility of BF synergistically enhance the adhesion between PP and the filler, thereby improving the mechanical properties of the ternary composites. Furthermore, the storage modulus and loss modulus of the ternary composites increase, while the loss factor and bonding factor decrease, with no significant change in the glass transition temperature. The good compatibility and bonding strength generated between MOS whiskers, BF, and PP result in optimal dynamic mechanics. For the M-B-30-3:1 sample, its tensile performance reaches 33.74 MPa, as well as bending strength and notched impact strength of 28.87 MPa and 9.77 kJ/m 2 , respectively.
研究领域:
材料科学
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高分子科学
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复合材料
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表面化学
·
纳米技术
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhenqiang Huang,Yanan Zhang,Ke Jia,Rui Zuo,Kemeng Ji,Mingming Chen
Lithium-sulfur batteries (LSBs) emerge as promising energy storage devices due to their high theoretical energy density . So far, there are constrained issues that need to be urgently addressed, such as the shuttle effect of lithium polysulfides (LiPS) and the sluggish kinetics of redox reactions . Herein, NiSe-Ni 2 P/C composite was synthesized and casted on the cathode side of polypropylene (PP) separator. This investigation reveals that the adsorption-catalysis synergistic effect of NiSe-Ni 2 P/C composite, accelerates the reduction of LiPS to lithium sulfide (Li 2 S) as well as the oxidation of Li 2 S. The synergistic effect effectively mitigates the shuttle effect of LiPS, reduces concentration polarization, and improves Coulombic efficiency (CE) throughout the entire lifespan. At a current density of 0.05 C, LSBs with NiSe-Ni 2 P/C modified PP separators exhibit a remarkable high initial CE of 97.0% and a substantial discharge specific capacity of 1205.4 mAh g s −1 . Even under conditions of a high sulfur loading (4.3 mg cm −2 ) and a limited electrolyte dosage (10 μL mg s −1 ), the LSBs maintained a reversible specific capacity of 804 mAh g s −1 , a CE of 94%, and an energy density of 1232.1 Wh kg s −1 after 720 h of continuous cycling at 0.05 C. This work provides a solution for achieving long-time, high-capacity, and high-CE electrochemical performance in LSBs with a high sulfur loading and a limited electrolyte dosage.
研究领域:
能源存储
·
材料科学
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DOI
高影响因子
JOURNAL OF ELASTOMERS AND PLASTICS
·
2017
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IF 0.787
Quan Zhou,Lu Yan,Xuejun Lai,Hongqiang Li,Xingrong Zeng
A new kind of polypropylene/ethylene–propylene–diene monomer (PP/EPDM) thermoplastic elastomer (TPE) with good mechanical properties and flame retardancy was prepared via in situ peroxide-induced dynamic vulcanization using lanthanum trimethacrylate (LaTMA) as a reinforcing agent. The morphology, structure, and mechanical properties and reinforcement mechanism of PP/EPDM/LaTMA TPE were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, rubber process analyzer, cross-link density test, and so on. The flame retardancy was investigated by limiting oxygen index (LOI) test. The results showed that when the amount of lanthanum oxide was 4.96 phr and methyl methacrylate was 7.85 phr, the compatibility between EPDM and PP was greatly improved. Besides, the tensile strength, tear strength, elongation at break, and hardness (shore A) of PP/EPDM/LaTMA TPE were increased from 6.2 MPa, 41.7 kN m−1, 148%, and 81 up to 11.1 MPa, 77.3 kN m−1, 365%, and 89, respectively. And the LOI of PP/EPDM/LaTMA TPE was increased to 19.0%. The SEM images, the higher G′, and the ionic cross-link suggested that a strong filler–filler network was formed by the polymerization and the grafted of LaTMA in the PP and EPDM phase which enhanced the compatibility between PP and EPDM. The DSC and FTIR results further proved that during the processing.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 5
·6249-6259
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IF 2.478
Han Yanxin,Shen Mingxia,Xu Yuanping,Yang Lu,Xue Yijiao,Tao Wenzhu
Owing to the large dielectric constant, ferroelectric poly(vinylidene fluoride) (PVDF) has emerged as an ideal potential component for dielectric capacitors with high energy density ( U e ). However, the intrinsic polarity of PVDF induces a large hysteresis loss, which dramatically reduces the discharged efficiency ( η ) and thus hinders its practical application. Herein, we demonstrate a simple modified polymer blending approach to enhance the η and meanwhile U e of PVDF through the employment of nonpolar polypropylene (PP). Despite the poor miscible nature of PVDF and PP, we realized the homogenous dispersion of PP within PVDF and their good interaction using a nonequilibrium manufacturing process. A minor addition of PP (< 15 wt%) demonstrated to be effective in depressing the hysteresis loss without degrading the polarization of PVDF, inducing superior η and U e . By further constructing a sandwich-structured for PP/PVDF blend composites, η and U e can be maximized to be 8.1 J/cm 3 and 75%, respectively.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xue-Qi Zhang,Rong-Fang Shen,Xiao-Jing Guo,Xi Yan,Yan Chen,Jiang-Tao Hu,Wan-zhong Lang
Herein, a convenient and environment-friendly grafting and reduction strategy was used to anchor bimetallic Ag-Cu nanoparticles on polypropylene (PP) fabrics. The as-prepared samples were characterized by various techniques including FE-SEM, XRD, EDX, XPS and FT-IR. The as-prepared sample exhibits excellent activity on the catalytic reduction of highly concentrated 4-NP, and the synergistic effect between Ag and Cu nanoparticles was proved. The entire catalytic reduction was generally considered to obey pseudo-order kinetics, affording high conversion even after 15 successive recycles. These results showed that the PP based composite with Ag-Cu nanoparticles effectively provided superb catalytic efficiency and stability in 4-nitrophenol reduction, and the PP based composites were suitable in practical applications for the treatment of diverse waste water.
研究领域:
材料科学
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环境工程
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纳米技术
·
催化
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 7
·期 1
·015308
·
IF 1.449
Suwei Wang,Ke Chen,Mingyin Jia,Ping Xue
The polypropylene (PP) and wood flour (WF) were mixed first and then extruded by a single-screw extruder foaming system to prepare the microcellular wood-polymer composites (WPCs) in this article. In addition to PP and WF, polyolefin elastomer (POE), talc powders and other fillers were also added to improve the cell structures of the samples. And two types of PP resins were introduced to the formulation of the composites to study the effect of the molecular chain structure on the rheological properties of the samples. Besides, the effects of processing conditions, such as die temperature and screw speed, on the properties of the samples were also investigated. The experimental results indicate that compared with PP1, the complex viscosity of PP2 decreased faster with the shear rate because of the linear molecular chain structure. Besides, the maximum impact strength of PP2/WF composites was 138.5 % higher than that of PP1/WF composites, while the tensile and flexural strength of PP2/WF composites were much lower. In addition, the best microcellular structure and the maximum impact strength were also obtained with the die temperature of 190 °C and the screw speed of 2 rpm.
研究领域:
材料科学
·
聚合物工程
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 10
·5697-5709
·
IF 1.674
Liu Xin,Dang Li,Nai Xueying,Dong Yaping,Li Wu
Well-dispersed, high-aspect-ratio 4ZnO·B 2 O 3 ·H 2 O whiskers (4ZnO·B 2 O 3 ·H 2 O HARw ) were synthesized by a facile hydrothermal method with the aid of ZnSO 4 ·7H 2 O. The formation mechanism was investigated, and the results showed that Zn 2+ and SO
2− 4
ions played a crucial role in the control of 4ZnO·B 2 O 3 ·H 2 O HARw extended along [010] direction. X-ray diffraction (XRD) analysis, high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetry (TG)-differential scanning calorimetry (DSC) results confirmed that the powder was 4ZnO·B 2 O 3 ·H 2 O. Scanning electron microscopy (SEM) and TEM showed that the average aspect ratio of the product was about 100. Nanocomposites of surface-modified 4ZnO·B 2 O 3 ·H 2 O SM-HARw /PP were prepared and their mechanical properties measured. The results suggested that the mechanical properties of 4ZnO·B 2 O 3 ·H 2 O SM-HARw /PP composites were superior to composites made with low-aspect-ratio whiskers (4ZnO·B 2 O 3 ·H 2 O SM-LARw ), which displayed poorer mechanical properties even at low addition.
研究领域:
材料科学
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高分子科学
·
纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ling Yang,Lei Sheng,Xingxu Gao,Xin Xie,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
Lithium metal batteries (LMBs) with ultra-high theoretical energy density are a prospective candidate to replace current lithium-ion batteries (LIBs). However, there are still two non-negligible problems of lithium dendrites and the volume expansion effect of LMBs. In this study, reduced graphene oxide (rGO)/Li-Al-LDH composite nanosheets were firstly prepared via a hydrothermal method and then vacuum filtered onto commercial polypropylene (PP) separator. This kind of rGO/Li-Al-LDH nanosheets layer is expected to improve the wettability of liquid electrolytes and thermal stability. Furthermore, rich- Li-Al LDH can promote more ionic carriers and channels, which exhibits higher-efficiency lithium-ion transport properties. Meanwhile, rGO with a graphitic-like structure is able to disperse the concentration of electrons at the sharp point when lithium dendrites arise. As a result, the discharge capacity of the Li||LiFePO 4 cells based on the rGO/Li-Al-LDH@PP separator is still 1.852 mAh after 250 cycles and the capacity decay rate is just 4.24%. It is demonstrated that a feasible and effective strategy for the modified separator can enhance the electrochemical performance of LMBs.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Changning Ran,Yizhou Liang,Boyu Li,Yuhan Xing,Xi Chen,Chuanyezi Cai,Jiacheng Guo,Gengqi Tong,Jichen Sun,Youyuan Zheng,Huimin Liao,Jianjun Zhang
Poly(vinylidene fluoride) (PVDF)-based ferroelectrics are essential for film capacitors, yet their high dielectric loss and low charge/discharge efficiency caused by ferroelectric hysteresis severely limit practical applications. Linear polypropylene (PP), in contrast, dominates the commercial capacitor market due to its high efficiency and low loss, prompting extensive efforts to combine the advantages of both polymers. However, existing approaches often rely on costly molecular design or complex film-forming processes, conflicting with the demands for low-cost and miniaturized electronic devices. Here, we report a solution-based and scalable strategy that avoids high-temperature melt processing to fabricate a hybrid dielectric film comprising a P(VDF-HFP) matrix, embedded PP chain segments, and core–shell structured BT@SiO2 nanoparticles. Polypropylene chain segments are embedded into the poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix via solution blending, forming molecularly interpenetrating interfaces that effectively suppress ferroelectric hysteresis. Core–shell structured BT@SiO2 nanoparticles are simultaneously incorporated to further enhance dielectric properties. The resulting P(VDF-HFP)-PP/BT@SiO2 nanocomposite films exhibit a high dielectric constant of 46, a charge/discharge efficiency consistently exceeding 80%, and a maximum energy density of 3.92 J/cm3. Phase-field simulations further reveal that the P(VDF-HFP)-PP/BT@SiO2 architecture with graded dielectric constants mitigates local electric field concentration, accounting for the excellent breakdown performance. Unlike conventional high-temperature melt processing or complex molecular design, this work offers a low-cost and scalable route that avoids high-temperature melt processing to high-performance polymer dielectrics, demonstrating that combining molecular interpenetration with core–shell filler engineering provides a promising pathway for next-generation capacitors.
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DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 4.1
Yang Shuang,Wan Wei,Qu Ziyu,Yi Keke,Zhang Di,Jiang You,Ye Zihong,Fang Xiang,Xie Jie,Dai Xinhua
Steroid hormones play crucial regulatory roles in human growth, development, reproduction, and the maintenance of internal environmental homeostasis. Because the concentrations of most hormones in the body are extremely low and their chemical properties vary widely, developing an accurate and sensitive quantitative method has become a primary objective in clinical diagnostics. In this study, an isotope dilution liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) method was developed and validated for the simultaneous quantification of 22 steroid hormones in human serum. To enhance extraction and purification efficiency, a protein precipitation–solid-phase extraction (PP-SPE) approach was employed, forming a “dual purification” strategy. The limits of quantification for progesterone, cortisol, dihydrotestosterone, and dehydroepiandrosterone sulfate were 0.05, 0.50, 0.05, and 1.00 ng/mL, respectively, representing an improvement over previously reported values obtained using similar sample pretreatment methods. Method validation results demonstrated strong linearity for all 22 steroid hormones ( R 2 > 0.98). Accuracy ranged from 86.9% to 119.5%, intra-day precision was below 9.7%, inter-day precision was below 12.0%, and the matrix effect was controlled within 80.3%–118.1%. These findings indicate that the method is accurate, reliable, and suitable for analyzing multiple components in complex serum matrices. Twenty real serum samples were analyzed to evaluate the clinical applicability of the method. The results demonstrated that this method can be used clinically to monitor steroid hormone levels, assist in diagnosing and treating endocrine disorders, and provide a diagnostic basis for adrenal diseases. It holds significant reference value for clinical laboratory testing. Graphical
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Xiaoqi Song,Xiping Lei,Tian Tian,Ting Yu,Hang Zhu,Zewei Zhang,Gengwei Li,Xuanhong Xu,Zhiqiang Wang
Lithium metal anode is broadly regarded as one of the most promising anode materials for batteries due to its extremely high specific capacity, very low redox potential, and mass density. Nevertheless, non-uniform deposition of lithium ions hinder the practical application of lithium metal batteries (LMBs). Herein, it was essential to design a separator with high electrolyte affinity to inhibit the non-uniform deposition of lithium ions. In this work, the wettability and electrolyte uptake of the polypropylene (PP) separator were remarkably improved by introducing reduced graphene oxide (rGO) and polyvinylidene fluoride (PVDF) to the surface of the separator through one-sided coating. The composite separator resulted in lithium ion with high conductivity (1.35 × 10 –3 S cm -1 ) and transfer number (0.63). After assembling the rGO/PVDF@PP separator into the LiFePO 4 ||Li battery and conducting the test, it was found that the specific discharge capacity could still reach 136 mAh g -1 after 100 cycles at 1C. Furthermore, After 1000 h of cycling in the assembled Li‖Li symmetric battery, there is no obvious generation of lithium dendrites on the surface of the lithium metal, indicating the successful suppression of lithium dendrites by the composite separator. This study offers a promising pathway for producing large quantities of new composite separators with high levels of safety.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）