JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2026
·
IF 2.2
Xiaochun Yin,Zhixiong Zhang,Yanhong Feng,Guizhen Zhang
In this study a melt conveying device dominated by pulsating elongational flow for inducing β-phase formation in PVDF was developed. The structure and working principles of the new device were introduced in detail. Focusing on flow-induced crystallization, the structure and properties of PVDF/poly (methyl methacrylate) (PMMA)/tetraphenyl phosphonium chloride (TPPC) films under the pulsating elongational flow were prepared and investigated. 2D-WAXD results demonstrated that this flow promotes the orientation of molecular chains within PVDF/PMMA/TPPC along the extrusion direction. 1D-WAXD and FTIR results confirmed enhanced interactions between both PMMA-PVDF and TPPC-PVDF, promoting increased formation of β-phase. When TPPC content is 1 wt.%, β-phase content reached 83.2%. Piezoelectric tests indicated the films exhibited a piezoelectric coefficient of approximately 22.6 pC/N, generating an open-circuit voltage of 2.64 V and a short-circuit current of 340 nA under an applied pressure of 79.1 kPa. Consequently, pulsating elongational processing enables scalable manufacturing of high-performance PVDF-based piezoelectric films.
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 10
·2671-2679
·
IF 2.5
Gu Yuanchun,Liu Huaqian
Significant ultraviolet (UV) technology was used to create a new composite polymer electrolyte (CPE) membrane composed of poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), benzophenone (Bp), and varying amounts of highly ion-conducting Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) particles. In lithium metal batteries, the CPE membranes demonstrated improved mechanical properties as well as superior electrochemical performances. CPE-15wt% LLZTO typically demonstrated the highest ionic conductivity (σ = 3.7 × 10 −3 S/cm) at room temperature, a high Li-transference (t + = 0.79), and a wider electrochemical stability window (ESW) above 5 V, as well as good mechanical strength (8.2 MPa). More importantly, the CPE-15wt% LLZTO membrane inhibits Li dendrite expansion in Li symmetric cells and exhibits long-term cyclic stability with a current density of 3 mA/cm 2 over 1150 h for Li/CPE-15wt% LLZTO/Li. The current study demonstrates that a UV-irradiated CPE membrane can be a promising electrolyte for next-generation lithium-metallic batteries.
研究领域:
材料科学
·
能源存储技术
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xuan Xie,Junyuan Tian,Xiaodan Cao,Xuexin Li,Jinxi Zhang,Zhiwei Wang,Kailiang Ren
With the rapid development of electric vehicles, power electronics, and medical devices, high-energy-density capacitors have attracted considerable research and engineering attention. In this investigation, we added surface-coated BNT-NN ((Bi0.5Na0.5)TiO3–NaNbO3) nanoparticles into the poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) matrix to fabricate BNT-NN/PVDF-HFP nanocomposites. We found that the composite with ultralow contents of BNT-NN (0.5 wt %) exhibited an ultrahigh energy density of 36.94 J cm–3 at 800 mV m–1, which is 17.5% higher than that of the pristine PVDF-HFP film. However, as the content of BNT-NN nanoparticles increased to 1%, the energy density decreased by 10.9% to 32.9 J cm–3 at 750 mV m–1. Compared with other PVDF-based nanocomposite films reported previously, this work shows a much higher energy density. This may be attributed to the largely increasing dielectric constant at the interface between the nanoparticles and their surrounding substrate, especially for the nanocomposite with a low volume content. The calculated dielectric constant from the theoretical model considering interface parameters fits well with the experimental data, indicating that the composites possess Kmax at ultralow nanoparticle contents. Therefore, the ultralow nanoparticle-added nanocomposites show great promise for ultrahigh-energy-density capacitor applications.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 37
·期 5
·493-499
·
IF 2.016
Dong Li,Liu Xiang-Dong,Xiong Zheng-Rong,Sheng De-Kun,Zhou Yan,Yang Yu-Ming
Herein, excellent UV-absorbing poly(vinylidene fluoride) (PVDF) membranes were fabricated through the pre-irradiation induced graft polymerization method. The PVDF chains irradiated with 60 Co γ -ray were modified with the polymerizable UV absorber 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2 H -benzotriazole (RUVA-93). The influences of irradiation dose and monomer concentration on the prepared PVDF-g-PRUVA-93 membranes were investigated, and the optimal condition was eventually obtained. The chemical structures of the films were studied by 1 H-NMR, FTIR, and XRD. UV light transmittance and DSC tests were used to characterize the UV-absorbing performance and thermal property of the PVDF films before and after modification. The results proved that the PRUVA-93 side chains were successfully incorporated into the PVDF main chains and the obtained PVDF- g -PRUVA-93 films possessed remarkable UV-absorbing property. The modified membrane made under the optimized experiment condition could completely block the UV light in the range of 200−387 nm. Additionally, the transmittance of the PVDF- g -PRUVA-93 film could be reduced to 0.04% in 280−320 nm, where the light irradiation could damage polymer materials most seriously.
研究领域:
高分子材料科学
·
辐射化学
·
功能薄膜材料
·
紫外线防护
·
膜科学与技术
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 19
·11381-11388
·
IF 3.108
Xiang Li,Binglun Chen,Weibin Cai,Tao Wang,Zhen Wu,Jiding Li
There is a lack of stable and hydrophobic organic solvent nanofiltration (OSN) membranes meaning that their implementation in non-polar solvent nanofiltration remains a challenge, typically in solvent (e.g. hexane) recovery during vegetable oil production (e.g. soybean oil/hexane). Considering this, novel trifluoropropylmethylsiloxane dimethylsiloxane (PDMS–PTFPMS)/polyvinylidene fluoride (PVDF) membranes, with both high hexane permeability of PDMS and excellent hexane stability of PTFPMS, were successfully developed to recover hexane via OSN. Their microstructure and surface properties were characterized by SEM, FTIR, DSC, TGA, XPS and contact angle measurements. We explored the effects of the ratio of the PTFPMS segment in polymer chain and polymer viscosity on membrane performance. With regards to the F50-M membrane, we also conducted a comprehensive study on the OSN performance of the F50-M membrane under different operational conditions. The oil rejection was above 95% with stable hexane permeability of 3.06 kg−1 μm m−2 h−1 bar−1 over a 32-day period. Experimental results confirmed its ability to recover hexane under various operational conditions, showing high oil rejection and excellent long-term operational stability. We attributed its outstanding performance to its unique microstructure and surface properties due to the fluorine-containing PTFPMS segment. This study indicates that fluoropolymer membranes are promising candidates in OSN processes, offering a wider choice of membrane materials and application fields.
研究领域:
膜科学
·
化学工程
·
分离技术
·
高分子材料
·
可持续加工
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Peng Cao,Jinyin Shi,Jianwen Zhang,Xiaozu Wang,Jun Tae Jung,Zhaohui Wang,Zhaoliang Cui,Young Moo Lee
Membrane fouling is a common phenomenon in anaerobic membrane bioreactor (AnMBR), deteriorating membrane performance and increasing the operation costs of AnMBR. In this study, β-phase polyvinylidene fluoride (PVDF) flat sheet membranes were successfully prepared by first mixing PVDF powder with ionic liquid [BMIM]PF 6 and subsequently casting them using thermally induced phase separation (TIPS), followed by high voltage polarization treatment to endow the PVDF membranes with piezoelectric properties . For the first time in AnMBR, we reported in this study on the piezoelectric PVDF membrane that generates in-situ vibrations to reduce membrane fouling by applying a given frequency and alternating voltage (AV). The results suggested that the steady-state water flux through the piezoelectric membrane in AnMBR operation increased along with the AV, enhancing it by up to 72.6% (at 20 V) compared to that of the membrane without applying AV. In addition, high water flux was obtained at the optimal operating frequency of 10 kHz when the cross-flow mode was taken into consideration in AnMBR operation in this study, although the resonance frequency with maximum amplitude of the membrane was 600 kHz. These results indicate that the piezoelectric β-PVDF membrane is effective at minimizing or alleviating the membrane fouling when the electric field simultaneously applied during AnMBR operation. During the 30-day operation of AnMBR with the β-PVDF membrane with poling, the COD removal rate was maintained at over 90%, even if the applied frequencies and voltages were changed during the operation.
研究领域:
环境工程
·
膜技术
·
废水处理
·
材料科学
·
压电材料
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DOI
高影响因子
eScience
·
2026
·
IF 36.6
Yucheng Lv,Tao Yang,Enhui Wang,Bo Shen,Kang Wang,Hongyang Wang,Kuo-Chih Chou,Xinmei Hou
Self-powered wearable electronics for real-time physiological monitoring require mechanical energy harvesters that simultaneously offer high sensitivity, flexibility, and power density, yet most existing piezoelectric nanogenerators struggle to efficiently convert low-frequency biomechanical energy under these constraints. In particular, polyvinylidene fluoride (PVDF)-based composite fibers often suffer from limited interfacial charge transport and insufficient piezoelectric response, which restricts their use in practical, textile-integrated devices. Here, we develop a high-performance piezoelectric composite fiber, PZT-O V /Ti 3 C 2 T x /PVDF, by electrostatic spinning self-assembly of oxygen vacancy–engineered lead zirconate titanate (PZT-O V ), MXene (Ti 3 C 2 T x ), and PVDF. The resulting prickly-fibril interfacial structure between PZT-O V and Ti 3 C 2 T x enables ultrafast carrier transport and enhanced mechanosensitive, yielding flexible piezoelectric nanogenerators (PENGs) with a 15-fold increase in current density under compression. Optimized devices deliver a peak power density of 4.78 μW cm −2 , a sensitivity of 1.46 V kPa −1 , and an energy conversion efficiency of 14.8%. Integrated into wearable textiles, these PENGs harvest subtle biomechanical energy and wirelessly transmit data via Bluetooth, enabling self-powered monitoring of body temperature and heart rate. These results demonstrate that combining oxygen vacancy engineering with MXene-assisted interfacial design in electrospun fibers is an effective strategy for advancing high-performance, self-powered wearable biosensing systems.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 34
·13854-13864
·
IF 4.5
Ren Lulu,Deng Rong,Yang Jingkui,Li Jian,Jin Jinbo,Lei Ting
A novel polyvinyl alcohol (PVA) and β-cyclodextrin (β-CD) cross-linked polyvinylidene fluoride (PVDF) (PVA-β-CD/PVDF) ultrafiltration membrane was prepared via in situ cross-linking in combination with non-solvent induced phase separation. Compared with PVDF/PVA blending membrane, cross-linking solved the issue of interface pores on the membrane surface caused by poor compatibility. And obvious cross-linking polymers were observed inside the membrane, which introduced more hydrophilic hydroxyl groups and thus enhanced the overall hydrophilicity of the membrane. When the PVA/β-CD ratio was 1:2, the cross-linked membrane exhibited better hydrophilicity, the dynamic water contact angle decreased from 74.6° to less than 2.5° in 65s, and the maximum pure water flux of 4561.5 L m −2 h −1 bar −1 (about 11 times that of PVDF membrane), BSA rejection ratio of 96.7% and a flux recovery rate of 93.5% were obtained. The mean pore size was 0.064 μm, and porosity was 78.44%. It could be concluded that in situ cross-linking simultaneously improved the penetration, separation and antifouling performances of the modified membranes. Our work provides some insights into fabricating high permeable and antifouling PVDF ultrafiltration membranes. Graphical abstract
研究领域:
材料科学
·
膜技术
·
高分子化学
·
环境工程
·
分离科学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 2
·1-12
·
IF 1.53
Zhao Meng,Ren Zhou-Zhi,Yang Ming-Bo,Yang Wei
In this study, effects of modified silica on the microstructure of polyvinylidene fluoride and its microporous membranes were investigated. The silica was modified by 3-Methacryloxypropyltrimethoxysilane to improve its compatibility with the polyvinylidene fluoride matrix. The relaxation time of polyvinylidene fluoride was markedly improved by modified nano-silica, especially at the loading of 0.1 wt‰. Effects of the modified silica on the nanocomposite microstructure, such as crystallization and orientation behavior, were studied in the manuscript. Furthermore, adding 3-Methacryloxypropyltrimethoxysilane modified silica could effectively handicap the relaxation of orientation structure in polyvinylidene fluoride and facilitate the formation of uniform lamellar structures which could be described by two-dimensional small-angle X-ray scattering testing. Finally, casting films with more uniform lamellar structure was also in favor of fabricating polyvinylidene fluoride microporous membranes by melt-stretching method.
研究领域:
高分子科学
·
材料工程
·
膜科学技术
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Temitope F. Ajibade,Jiaoxing Xu,Huali Tian,Lunhui Guan,Kaisong Zhang
Removal of emulsified oil droplets less than 20 μm and maintaining operational stability remains a key concern in the field of oily wastewater treatment. In this work, a major breakthrough was achieved via modification of polyacrylonitrile/polyvinylidene fluoride (PAN/PVDF) blended ultra-filtration (UF) membrane with oxidized multiwall carbon nanotubes (O-MWCNT) to tailor the membrane chemical properties for boosted oil and water separation. Overall, a high separation performance of oily emulsion (99%) and simultaneous increase in flux up to 65% was achieved using the novel O-MWCNT/PAN/PVDF membrane. Moreover, the performance of the O-MWCNT/PAN/PVDF membrane was consistent after 28-cycles of oil separation and the antifouling properties were exceptionally enhanced by 96%. In addition, there was a significant decrease in fouling in terms of the cake, pore, and intrinsic resistance. Furthermore, evidence of even dispersal of nanofillers was confirmed by an increase of casting solution viscosity with increasing O-MWCNT. Consequently, this provides a remarkable mechanical/tensile strength of 5.94 MPa, and 16.05% elongation of the O-MWCNT/PAN/PVDF fingerlike structured UF membrane. The novel O-MWCNT/PAN/PVDF membrane demonstrated promising properties that balanced the membrane tradeoff between permeability and selectivity, as well as, improved mechanical strength and operational stability that can elongate the life span of the membrane in oily wastewater treatment.
研究领域:
膜技术
·
水处理
·
纳米材料
·
分离科学
·
环境工程
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DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Wenling Fan,Xiao Xu,Lingling Li,Long Sun,Chang Gao,Le Luo,Jingjing Zhang,Ziqi Sun,Ying Xu,Yutong Gao
This study elucidates the stabilization mechanism underpinning the efficient and long-term separation of Traditional Chinese Medicine (TCM) volatile oils from oil-in-water emulsions by polyvinylidene fluoride/phytic acid-polyethyleneimine/Fe3 + (PVDF/PA-PEI/Fe3 + ) membranes. Through integrated molecular docking and Schneider's thermodynamic analysis, we demonstrate that the exceptional stability arises from a dual-crosslinked architecture: (1) High-affinity coordination bonds between phytic acid (PA) and Fe³⁺ (binding energy: −5.2 kcal/mol; ΔH m = 1.05 × 10⁻³ cal/mol) establish a robust framework resistant to chemical and thermal degradation, while (2) Fe³⁺-mediated interfacial bridging—achieved through lone-pair electron sharing with fluorine atoms in PVDF (Polyvinylidene Fluoride) and electrostatic interactions with polyethyleneimine (PEI)—synergistically suppresses delamination. Experimental validation demonstrates exceptional durability: Fourier-transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) analyses confirm retention of Fe³⁺-phosphate coordination bonds and pore structural integrity following 24-h exposures to pH extremes (3–11), 100% ethanol, 95°C thermal treatment, and 0.25 MPa pressure. The membrane sustains >95% oil retention capacity and stable steady-state permeate flux (≈2750 L·m –2 ·h –1 (LMH), 2750 LMH·bar –1 ) throughout the 60-day cyclic operation (8h of filtration per day, with the membrane immersed in the turmeric oil-in-water emulsion during off-operation hours and characterized every 7 days). The high flux is attributed to the synergistic effect of the large-pore PVDF substrate (Molecular weight cut-off (MWCO) of 200,000 Da) and the superhydrophilic PA-PEI/Fe 3+ coating, Tests were conducted on 4 cm-radius membraneswith an effective filtration area of 0.005024 m² under the conditions of Transmembrane pressure (TMP) of 0.1 MPa and 25±1°C.With corrosion resistance demonstrated by negligible flux variation (flux recovery ratio, (FRR) <100%) when treating aggressive turmeric oil emulsions. This study establishes a dual-anchoring strategy that effectively mitigates volatility-induced membrane corrosion, thereby positioning PVDF/PA-PEI/Fe³⁺ membranes as an industrially viable platform for sustainable extraction of Traditional Chinese Medicine (TCM) volatile components. Download: Download high-res image (438KB) Download: Download full-size image
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DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 6
·1096
·
IF 5.3
Yi Cui,Yang Sui,Peng Wei,Yinan Lv,Chuanbo Cong,Xiaoyu Meng,Hai-Mu Ye,Qiong Zhou
Research on the rheological performance and mechanism of polymer nanocomposites (PNCs), mainly focuses on non-polar polymer matrices, but rarely on strongly polar ones. To fill this gap, this paper explores the influence of nanofillers on the rheological properties of poly (vinylidene difluoride) (PVDF). The effects of particle diameter and content on the microstructure, rheology, crystallization, and mechanical properties of PVDF/SiO2were analyzed, by TEM, DLS, DMA, and DSC. The results show that nanoparticles can greatly reduce the entanglement degree and viscosity of PVDF (up to 76%), without affecting the hydrogen bonds of the matrix, which can be explained by selective adsorption theory. Moreover, uniformly dispersed nanoparticles can promote the crystallization and mechanical properties of PVDF. In summary, the viscosity regulation mechanism of nanoparticles for non-polar polymers, is also applicable to PVDF, with strong polarity, which is of great value for exploring the rheological behavior of PNCs and guiding the process of polymers.Keywords:poly (vinylidene difluoride);rheological behaviors;entanglements
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）