Polymers
·
2024
·Vol. 16
·期 5
·630
·
IF 4.7
Xiang Li,Qiao Xu
In this work, the EVOH/Ti3C2composite fibers were prepared via electrospinning and the effect of added Ti3C2on the structure and properties of electrospun EVOH fibrous membranes was further investigated. The morphology, crystal structure, thermal properties, wettability, tensile properties, as well as air permeability and water vapor permeability of as-prepared EVOH/Ti3C2composite fibers were studied. The Ti3C2is uniformly loaded onto the surface and inside the composite fiber and affects the fiber diameters. Furthermore, The Ti3C2self-orients along the fiber axis and does not change the crystal structure of the electrospun EVOH fibers, improving the crystallinity and thermal stability of the electrospun EVOH/Ti3C2fibrous membranes. With the increase in the Ti3C2concentration in the electrospinning polymer solution, the addition of Ti3C2not only rapidly improves the wettability of the fibrous membranes, but also enhances their air permeability, compared with the pristine electrospun EVOH fibrous membranes. The experimental results provide theoretical guidance for the preparation of Ti3C2composite fibers, and also expand the application of electrospun EVOH and EVOH/Ti3C2fibrous membranes.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2020
·
IF 1.529
Bin Wang,Chong Lu,Jing Hu,Weixin Lu
Ethylene vinyl alcohol (EVOH) with excellent barrier properties has insufficient thermomechanical properties. The introduction of magnesium chloride (MgCl2) as an initiator in EVOH blends improved its properties by cross-linking. Torque behavior and gel experiment analysis indicated that a cross-linking in EVOH was formed. The cross-linking mechanism was confirmed through 13C nuclear magnetic resonance spectroscopy (13C NMR) and Fourier-transform infrared (FTIR) spectrometry. In 13C NMR spectra, the splitting peaks of CH carbon and CH2 carbon tended to disappear, and the stretching vibration peak of –C=C– was observed in the FTIR spectra. The formation of hydrogen bond between MgCl2 and EVOH destroyed the intramolecular and intermolecular hydrogen bonds of EVOH, which contributed to the dehydration of –OH to form –C=C–, and –C=C– was the basis for a cross-linking reaction. The thermal analysis of blends demonstrated that the melting temperature and crystallization temperature decreased, and the crystallinity gradually disappeared when the MgCl2 content increased. Glass transition temperature significantly increased as the intermolecular force enhanced. Thermogravimetric analysis showed that a cross-linked structure could improve the thermostability of EVOH with an increase in the MgCl2 content. Mechanical test results revealed a remarkable increase in the tensile strength of EVOH as the MgCl2 content increased.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2017
·Vol. 30
·期 9
·587-600
·
IF 1.32
Haili Wang,Chunxiang Yang,Jing Wang,Mo Chen,Donglei Luan,Li Li
Various studies have provided information on active packaging to prevent food putrefaction effectively . In this work, ethylene–vinyl alcohol copolymer (EVOH) films with geraniol (Ger) and α-terpilenol (Ter) were successfully prepared by extrusion. The mechanical, thermal, oxygen barrier and antimicrobial properties of the packaging films were characterized, and the application of the films in snakehead preservation was examined. Thermogravimetric analysis showed that the addition of Ger and Ter did not decrease the films properties but improved their oxygen barrier property and thermostability. Moreover, the incorporation of Ger and Ter inhibited the growth of Escherichia coli , Salmonella enterica and Listeria monocytogenes . Both of the films, EVOH/Ger (EVOH/Ger) and EVOH/Ter (EVOH/Ter), reduced Salmonella enterica by 2.36 ± 0.17 and 1.91 ± 0.06 log units, respectively. Meanwhile, the effects of EVOH/Ger and EVOH/Ter on quality assessment of snakehead slices were examined through sensory tests and analyses of biochemical indices during refrigerated storage (4°C ± 1°C) for 10 days. Sensory properties, total viable counts, total volatile basic nitrogen, thiobarbituric acid and pH values were evaluated. On eight day, compared with the control fish samples, the total viable counts and total volatile basic nitrogen values cut down 1.98 ± 0.02 log units and 11.3 ± 0.11 mgN/100 g, respectively, for fish samples packaged by EVOH/Ger. The active films containing 6% (wt) Ger and 6% (wt) Ter inhibited the growth of E. coli , S. enterica and L. monocytogenes and effectively extended shelf life by 4–5 days under cold-storage conditions compared with the control group. Copyright © 2017 John Wiley & Sons, Ltd.
研究领域:
食品科学
·
包装工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 5
·843
·
IF 3.164
Kangjun Xie,Zhen Dong,Yicheng Wang,Wei Qi,Maolin Zhai,Long Zhao
A novel amphoteric ion exchange membrane (AIEM) was successfully prepared by one-step radiation grafting of sodium styrene sulfonate (SSS) and dimethylaminoethyl methacrylate (DMAEMA) onto ethylene-vinylalcohol copolymer (EVOH) powder and sequent transferring into film by casting method. Fourier transform infrared spectrometry (FT-IR), thermal gravimetric analyzer (TGA) and elemental analysis testified SSS and DMAEMA were successfully grafted onto EVOH. The ion exchange capacity, water uptake and proton conductivity of the resulting AIEM increased with grafting yield (GY). At the GY of 40.9%, the permeability of vanadium ions of AIEM was 3.98 × 10−7cm2min−1, which was better than Nafion117 membrane. Furthermore, the cost of this AIEM is much lower than that of Nafion117 membrane. This work provided a low cost and simple method for fabrication of the ion exchange membrane for vanadium redox flow battery (VRFB). Meanwhile, it also provided a new direction for the application of EVOH.Keywords:radiation grafting;ion exchange membrane;EVOH;VRFB
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Qin Cheng,Jinping Gan,Kai Cai,Ming Xia,Yi Wu,Shanshan He,Pan Cheng,Qihao Guo,Ke Liu,Dong Wang
High-quality polyamide (PA) nanofiltration (NF) membrane with excellent selectivity and permeability is of great research significant because of their high practical application value, especially for the precise separation of divalent and monovalent ions, such as Mg 2+ and Li + . Herein, UiO-66-NH 2 nanoparticles (NPs) decorated ethylene vinyl alcohol copolymer (EVOH) nanofiber substrate (M-NFM) was utilized to construct high-quality Janus NF membrane through interfacial polymerization (IP) reaction using polyethyleneimine (PEI) and piperazine (PIP) as aqueous phase monomers and trimesoyl chloride (TMC) as organic phase monomers. The incorporation of UiO-66-NH 2 NPs significantly influenced the hydrophilicity, surface morphology, and pore structure of the substrate, thereby enhancing the properties of the resulting NF. Optimally prepared membranes demonstrated improved separation performance, permeability, stability, and antifouling characteristics compared to the unmodified substrate. Notably, at a Mg 2+ /Li + ratio of 30, the resultant NF membrane achieved a separation factor (S Mg 2+ /Li + ) of 28.4 and a salt permeation flux of 156.8 L·m -2 ·h -1 ·MPa -1 . Additionally, the membrane exhibited over 98% rejection rates for FeCl 3 , CuSO 4 , CaCl 2 , MgSO 4 , MgCl 2 and Na 2 SO 4 with fluxes exceeding 150 L·m -2 ·h -1 ·MPa -1 , highlighting its effectiveness in rejecting multivalent ions. This research presents a simpler and more reliable approach to the fabrication of high-quality Janus PA NF membrane, offering promising potential for industrial-scale applications.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Wenmin Zhang,Rong Liu,Xiaoli Sun,Heng An,Tiantian Min,Zhu Zhu,Yongqiang Wen
Active packaging systems that are sustainable and capable of delivering antimicrobial agents intelligently are in demand in food industry. In this work, an extremely simple strategy inspired by leaf stomata was introduced to smartly trigger thymol release at different relative humidity using EVOH as the “stomata”. Thymol was encapsulated into ethylene vinyl alcohol copolymer (EVOH) to form core–shell nanofibers (thymol/EVOH) via coaxial electrospinning. The core–shell structure of the nanofiber was confirmed by transmission electron microscopy . Thymol release could be triggered by the relative humidity (RH), and nanofibers released more thymol at 90% RH than at 30% RH. In addition, this functionalized nanofibers showed excellent antibacterial activity in vitro against Escherichia coli and Staphylococcus aureus and performed good biocompatibility. The nanofiber film was also applied to fruit preservation, and was found to extend the strawberries shelf-life. Sensory analysis also showed that the strawberries flavor treated by thymol/EVOH nanofibers presented high acceptability. The work will provide an innovative approach to design packaging film.
研究领域:
食品科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qing Zhu,Yuxia Jin,Wen Wang,Gang Sun,Dong Wang
Biomimetic actuators with rapid response speed, high sensitivity, and selectivity to external stimulus have found potential applications in smart switches, artificial muscles, and soft robots. The nanoscale structures of actuators enhance the exposed area to stimulus as well as enable versatile control of the actuation behaviors. Freestanding, flexible, and porous water-driven actuators with poly(vinyl alcohol-co-ethylene) (EVOH) nanofibers as the substrate and super hydrophilic nanoscale cellulose materials (cellulose nanofibers, cellulose nanocrystals, bacterial cellulose) as the active substance via uniform mixing or surface depositing were fabricated. The effects of the EVOH nanofiber substrate, the structures and concentrations of nanoscale cellulose materials, as well as the different environmental stimuli like humidity and temperature on the performance of actuators were studied. The water-driven actuation mechanism was proposed from the macroscopic and molecular aspects and the analysis of Gibbs free energy and mechanical energy. The actuator could bend to an angle of 180° and recovered less than 1 s for more than 100 circles without compromising properties when the environmental moisture changed. Furthermore, the multidimensional deformation behaviors of the water-stimulated actuators could also be well tuned by varying the orientations of the nanoscale materials. Additionally, the applications of the prepared actuator were demonstrated.
研究领域:
材料科学
·
生物仿生学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ke Liu,Nian Liu,Siqi Ma,Pan Cheng,Wei Hu,Xiaodan Jia,Qin Cheng,Jia Xu,Qihao Guo,Dong Wang
For energy-saving purposes, the pursuit of ultrahigh permeance nanofiltration membranes without sacrificing selectivity is never-ending in desalination, wastewater treatment, and industrial product separation. Herein, we reported a novel facile route to engineer a highly porous and superhydrophilic nanofibrous substrate to mediate the interfacial polymerization between trimesoyl chloride and piperazine, generating an ultrathin PA active layer (∼13 nm) with a hierarchical crumpled surface. The wet laying process and subsequent plasma treatment endowed a rougher and more hydrophilic surface for ethylene vinyl alcohol copolymer (EVOH) nanofibers in the thin compact nanofibrous scaffold (∼9 μm) with a mean pore size of 210 nm, radically different from the nanofibrous membrane by other methods. Nanofibrous scaffold with these features provide abundant thin–thick alternative continuous water layers between nanofibers and organic phase, facilitating the formation of the abovementioned PA layer. As a result, an ultrahigh permeance of 42.25 L·m–2 h–1 bar–1 and a reasonably high rejection of 95.97% to 1000 ppm Na2SO4 feed solution were obtained, superior to most state-of-the-art NF membranes reported so far. Our work provides an easy and scalable method to fabricate advanced PA NF membranes with outstanding performance, highlighting its great potential in liquid separation.
研究领域:
材料科学
·
环境工程
·
水处理技术
✓ 已验证
DOI
高影响因子
Advanced Membranes
·
2025
·
IF 9.5
Guoke Zhao,Tian Zhong,Xinkai Li,Hao Yu,Guoyuan Pan,Yang Zhang,Yiqun Liu
Scholarly discourse surrounding the thin film composite organic solvent nanofiltration (TFC OSN) membrane field has largely been dominated by focusing on the optimization of the selective layer. However, this often leaves the porous support layer, with its innate solvent resistance, cost-effectiveness, and superior permeability, in the shadows. This study presents a novel OSN membrane utilizing a polyethylene (PE) battery separator as the porous substrate. The structural affinity between ethylene-vinyl alcohol and PE facilitates efficient hydrophilic modification, which allows for uniform and compact polyamide selective layer formation through interfacial polymerization. The HPE-NF-1.0 membrane exhibits rejections of 99.5 %, 96.7 %, 100 %, and 97.2 % for Methyl Orange, Rhodamine B, Congo red, and Rose Bengal, respectively. It also shows a solvent flux of 52.5 LMH in methanol and robust resistance against alcoholic solvents and DMF. Using PE as the porous substrate, we bypass intricate and time-demanding cross-linking processes and complex pore-preservation post-treatments, providing a simplified strategy for TFC OSN membrane fabrication.
研究领域:
材料科学
·
膜分离技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2022
·Vol. 223
·期 16
·2200088
·
IF 2.996
Siqi Ma,Nian Liu,Pan Cheng,Wei Hu,Xiaodan Jia,Qihao Guo,Ming Xia,Qin Cheng,Ke Liu,Dong Wang
The pursuit of highly permeable thin-film nanocomposite (TFNC) nanofiltration (NF) membranes with desirable selectivity is an eternal topic for desalination and wastewater treatment. Herein, a facile route to engineer polyamide (PA) NF membranes is reported with a coral-reef-like thin PA active layer atop a polydopamine pre-decorated ethylene vinyl alcohol copolymer (EVOH) nanofiber scaffold (EVOH-PDA) via interfacial polymerization (IP). EVOH-PDA possesses a submicron pore size and super-hydrophilic surface, which provides abundant thin water layers covering nanofibers in the IP process resulting in the PA layer with a morphology of coral-reef-like highland surrounded by flat low-lying regions. The resultant NF membrane presents high permeance of 32.19 L m −2 h −1 bar −1 and high rejection of 96.52% to 1000 ppm Na 2 SO 4 feed solution with a stable performance against operation time and high salt concentration. This work provides a new approach to fabricating PA TFNC membranes with outstanding NF performance in liquid separation applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Yuxia Jin,Qing Zhu,Weibing Zhong,Kelu Yan,Dong Wang
Despite much progress in solvent-sensitive actuators, most of the actuators are sensitive to water, ethanol, or acetone with low responsive speed and small curvature. Herein, a simple approach was introduced to fabricate a new solvent-sensitive bilayer actuator consisting of a poly(vinyl alcohol-co-ethylene) (EVOH) nanofibrous membrane and polystyrene (PS) microspheres. The actuator showed superfast and multistimulus responsive ability to organic vapors of toluene, chloroform, THF, and acetone. With solvents stimulation, the difference in swelling degree between the EVOH layer and PS microspheres layer contributed to the asymmetric expansions or contractions of two layers, therefore resulting in the mechanical deformation of the actuator. The flexible and porous EVOH nanofibrous membrane, as well as the spherical PS, could improve the response rate and deformation scale. This bilayer actuator could bend quickly into a multicoil with the curvature of 21.02 cm–1 within 0.15 s in response to toluene vapor, and the bending–unbending process could repeat more than 150 times when the deformation degree was controlled by cross-linking PS microspheres with divinylbenzene. This study will provide an important insight for the development of new solvent-sensitive devices and applications in volatile organic compounds detecting.
研究领域:
材料科学
·
化学工程
·
智能材料
✓ 已验证
DOI
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 26
·4991-5000
·
IF 4.046
Pan Cheng,Peng Huang,Cancan Ji,Xiaodan Jia,Qihao Guo,Ming Xia,Qin Cheng,Jia Xu,Ke Liu,Dong Wang
Constructing a sterile membrane with a robust and antifouling surface is a powerful means to improve the sterile filtration efficiency of sterile membranes. In this work, a robust EVOH nanofibrous sterile membrane was facilely fabricated by the method of in situ crosslinking with glutaraldehyde and surface plasma treatment. The resultant EVOH nanofibrous sterile membrane possessed a carboxylated-crosslinked surface, with high hydrophilicity, which generated high chemical stability, high-temperature steam resistance, and an ultrahigh antifouling performance against bovine serum albumin, ribonucleic acid and nanoparticle pollutants. Moreover, the membrane also exhibited a reasonably high primary water permeance (4522.2 LMH bar−1 at 0.2 MPa), as well as an absolute interception rate (100%) of Escherichia coli, Staphylococcus aureus cells and Brevundimonas diminuta superior to the state-of-the-art sterile membrane. Moreover, the modified membrane packed syringe-driven filter presented 100% interception (LRV ≥ 7) to Brevundimonas diminuta and high permeation flux (from 10.8 to 41.8 L·h−1) in a wide operating pressure range of 0.1 MPa to 0.6 MPa, indicating its potential in real bio-separation applications. This work provides a facile strategy for the preparation of a high-performance sterile membrane for biological drug product sterilization.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）