MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 6
·2200826
·
IF 5.006
Jiaqi Li,Weilin Feng,Mengxiao Zhang,Xiaohe Wang,Chuanjie Fang,Jianyu Wang,Lin Zhang,Liping Zhu
Polymers of intrinsic microporosity (PIMs) are a class of microporous organic materials that contain interconnected pores of less than 2 nm in diameter. Such materials are of great potential used in membranes for molecular separation, such as drug fractionation in pharmaceutical industry. However, the PIMs membranes are often susceptible to low separation selectivity toward different molecules due to their wide pore size distribution. Herein, a linear polyimide, Matrimid, is incorporated with PIM-1 (a typical member of PIMs) by solution blending, and the blends are dip-coated onto a polyimide P84 support membrane to prepare thin-film composite (TFC) membranes to control pore size distribution while keep high microporosity. The component miscibility, pore characteristics, and molecular separation performances of the Matrimid/PIM-1 TFC membranes are investigated in detail. The Matrimid and PIM-1 are partially miscible due to their similar Hansen solubility parameters. The Matrimid endows the selective layers (coatings) with narrower pore size distribution due to more compact chain packing. The prepared Matrimid/PIM-1 TFC membranes show high selectivity for separation of riboflavin (80% of retention) and isatin (only 5% of retention). The developed membranes exhibit great potential for separating molecules with different molecular weights.
研究领域:
材料科学
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化学工程
·
生物医学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 36
·47937
·
IF 2.188
Shan Jiang,Wei Wang,Wei Chen,Hongwen Zhang,Kemin Wang
Polypropylene (PP)–silicon dioxide (SiO 2 ) compound microporous membranes were fabricated by a melt-stretching method. Although the permeability, porosity, and hydrophilicity values of the microporous membranes were found to be highest at an SiO 2 content of 2 wt %, the heat resistance of the membranes was relatively low. To improve the heat resistance of the microporous membranes, a macromolecular coupling agent, PP- g -poly(α-methyl styrene- co -glycidyl methacrylate- co -γ-methacryloxypropyl trimethoxy silane) (PAGK), was introduced into the membrane. In the PP–PP- g -PAGK–SiO 2 composite systems, the content of SiO 2 was controlled at 2 wt %, and the proportion of PP- g -PAGK was varied. With increasing PP- g -PAGK content to 0.6%, the Gurley value decreased from 250 to 239 s, and the porosity increased from 50.8 to 51.6%. The hydrophilicity of the microporous membranes increased with the incorporation of PP- g -PAGK, and their water vapor transmission rate reached a maximum of 3360 g m −2 /24 h at a PP- g -PAGK content of 0.6%. The heat resistance of the PP–PP- g -PAGK–SiO 2 compound microporous membranes was slightly higher than that of the pure PP microporous membrane. Additionally, the cycle performance of a cell assembled with the PP–PP- g -PAGK–SiO 2 membrane was better than that constructed with the pure PP membrane. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47937.
研究领域:
高分子科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 11
·46020
·
IF 1.86
Shan Jiang,Wei Wang,Tianya Huang,Jie Ma,Yonghong Ding,Qiang Yu
Terpolymer poly(α-methylstyrene- co -glycidyl methacrylate- co -4-acryloyl tetraphenylethylene) (PAGT) was synthesized by radical copolymerization using α-methylstyrene, glycidyl methacrylate, and trace fluorescent monomer 4-acryloyl tetraphenylethylene. Thermal decomposition of α-methylstyrene constitutional units in copolymer chains is known to produce macromolecular radicals at temperatures exceeding 90 °C, which may be melt-grafted to polypropylene (PP) without other initiators by means of extrusion. In this study, the PP- g -PAGT microporous material was prepared by casting and stretching. The structure and properties of the PAGT were characterized by Fourier transform infrared spectroscopy, 1 H-nuclear magnetic resonance, and thermogravimetic analysis. The grafting degree and rheological properties proved that the PAGT chains were successfully grafted onto the PP. The uniformity of the PAGT in the PP- g -PAGT was observed using a spectrofluorophotometer. The polarity of the cast membrane was characterized by the water contact angle. The results showed that the PAGT evenly grafted onto the PP, and the polarity and hydrophilicity of the cast membranes were improved. The microporous structure of the separator was observed via scanning electron microscopy. Testing of the performance of the lithium battery showed that the impedance decreased and the ionic conductivity increased with the introduction of PAGT onto PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46020.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 8
·2622-2640
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IF 2.573
Ying Zhang,Lei Sheng,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
In the preparation of polyethylene (PE) microporous membrane, the stretching process of PE/liquid paraffin (LP) blend is of great significance for improving the mechanical properties and optimizing the pore size and its distribution. In this study, we have adopted a method that combines experimental investigation and numerical simulation to explore crystal structure transformation and residual stress distribution of PE matrix during the stretching process. First of all, the X-ray diffraction, small-angle X-ray scattering test, and tensile strength test are used to analyze these PE/LP blend samples that are processed at different stretching temperatures (110°C, 115°C, 120°C, 125°C) and different stretching ratios (2 × 2, 3 × 3, 4 × 4, 5 × 5). It is found that a higher temperature or larger ratio is beneficial for crystallizing of PE long chains and affecting the tension strength. After the extraction process, the obtained PE microporous membranes have more uniform pore size distribution and an increased pore diameter according to the results of scanning electron microscopy and porosity test. It is attributed to the fact that residual stress is more easily stored in the amorphous region of PE microporous membrane. PE microporous membranes can have higher crystallinity and well-dispersed crystal region by controlling a matched temperature and ratio. It is inspired for optimizing the technological parameters in industrial production.
研究领域:
材料科学
·
高分子物理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yuxin Zhu,Ting Zhang,Hong Liu,Chenkai Jin,Chengqi Feng,Juncheng Huang,Haining Na,Jin Zhu
The preparation of stable and efficient cellulose-based oil/water separation membranes is of great significance in solving the problem of industrial oily wastewater. Herein, rod-like hydroxyapatite (HAP) modified microfibrillated celluloses (MFCs) are used to form the fibrous framework to produce a microporous PDMS-MFC-HAP membrane. The membrane shows good superhydrophobicity with a water contact angle of 151.6°. It exhibits the oil-water separation performance for various water-in-oil emulsions. The separation flux of the membrane is up to 3665.3 L·m −2 ·h −1 ·bar −1 under 0.5 bar pressure with a separation efficiency of over 99.6 %. The PDMS-MFC-HAP membrane could maintain a high separation efficiency of 98.6 % after 20 cycles. This study provides a simple and effective method to fabricate cellulose-based superhydrophobic membranes, which have a greater potential to achieve oil-water separation for oily wastewater treatment with high efficiency.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Nature Energy
·
2022
·Vol. 7
·期 2
·153-162
·
IF 67.439
Tang Hongying,Geng Kang,Wu Lei,Liu Junjie,Chen Zhiquan,You Wei,Yan Feng,Guiver Michael D.,Li Nanwen
Conventional proton exchange membrane fuel cells (PEMFCs) operate within narrow temperature ranges. Typically, they are run at either 80‒90 °C using fully humidified perfluorosulfonic acid membranes, or at 140‒180 °C using non-humidified phosphoric acid (PA)-doped membranes, to avoid water condensation-induced PA leaching. However, the ability to function over a broader range of temperature and humidity could simplify heat and water management, thus reducing costs. Here we present PA-doped intrinsically ultramicroporous membranes constructed from rigid, high free volume, Tröger’s base-derived polymers, which allow operation from −20 to 200 °C. Membranes with an average ultramicropore radius of 3.3 Å show a syphoning effect that allows high retention of PA even under highly humidified conditions and present more than three orders of magnitude higher proton conductivity retention than conventional dense PA-doped polybenzimidazole membranes. The resulting PA-doped PEMFCs display 95% peak power density retention after 150 start-up/shut-down cycles at 15 °C and can accomplish over 100 cycles, even at −20 °C.
研究领域:
材料科学
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能源工程
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化学工程
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 6
·1655-1664
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IF 2.339
Li Aiai,Gu KaiFeng,Zheng Honglin,Zhou Yong,Gao Congjie
Polypropylene microporous membranes (PPMMs) have a broad range of applications owing to their outstanding performances and low cost. However, PPMMs are highly hydrophobic and the water permeability is terrible, which enormously obstructs the applications of PP membrane in water treatment. In this work, PPMMs are modified by a chemical crosslinking method, and a crosslinked hydrophilic coating layer is formed on the membrane surface, which greatly improves the hydrophilicity and permeability of the PP membrane. The water flux of the modified membranes is about 350 L·m −2 ·h −1 (the pressure of 0.2 MPa). The water contact angles are reduced to about 10°, and compared to unmodified membranes, it is reduced by 90°. Meanwhile, the flux repeatability experiment of the modified membrane proves that the crosslinking agent improves the stability of the membrane. X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectrometer are employed for the characterization of chemical properties and morphological variances of original and modified membrane surfaces. The results exhibit that the groups such as C–O, O=C–O, and O–C–O are introduced successfully to the PP membrane surface.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Lewen Sun,Jufang Zhu,Yanchao Che,Qiuying Li,Weihong Guo,Chifei Wu
In this article, polytetrafluoroethylene (PTFE) microporous membranes with excellent tensile strength and good wear durability were successfully fabricated by the addition of nano-alumina (Al2O3). The friction and mechanical behavior of PTFE microporous membranes with different nano-Al2O3 contents were investigated by Martindale abrasion tester, dynamic mechanical analysis, and universal testing machine. Scanning electron microscopy was applied to analyze the surface, longitudinal section, and worn surface of the microporous membranes. Results demonstrated that nano-Al2O3 particles were dispersed into the “node” structures of PTFE microporous membranes and acted as the skeleton, leading to the increasing of the tensile strength remarkably. The wear rate reduced significantly with the addition of nano-Al2O3 and was affected by nano-Al2O3 content. Additionally, the wear mechanism of the microporous membranes was also discussed based on the study results.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·762-771
·
IF 12.732
Ziming Zhao,Qing Dai,Xiaofeng Li,Suobo Zhang,Shenghai Li,Xianfeng Li
Vanadium flow batteries (VFBs) are attracting increasing attention due to their promising prospect for large-scale energy storage. However, the high cost and low selectivity of current membranes limit their further application. In this work, a highly conductive (1122 mS cm−1) and stable microporous membrane was obtained via oxidizing a dense anion exchange membrane by an in situ or off situ process. Poly[(fluorene alkylene)-co-(biphenyl alkylene)] (PFBA-QA) with pendant quaternary ammonium alkyl groups was designed and prepared. The difference in stability between the main and side chains of the ether-free polymer allows the transformation of ion channels from aggregated ion clusters in the dense membrane to micropores by sacrificing the side chain in a strong oxidative environment. As a result, a VFB assembled with the resulting membrane demonstrates a CE of 97% and an EE of 88% at a current density of 80 mA cm−2, which can stably run for more than 290 cycles. This paper provides a new option for the membrane design in VFBs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 28
·5125-5132
·
IF 5.52
Duo Qi,Chengji Zhao,Liyuan Zhang,Xuefeng Li,Guibin Li,Hui Na
A novel in situ-foaming material was successfully prepared by a naphthalene-based hydroxyl-containing poly(arylene ether ketone) (PAEK) modified with thermally labile tert-butyloxycarbonyl which can decompose and in situ generate CO2 and isobutene as the foaming agents. The structure and thermal properties of the polymers were characterized by using 1H NMR spectra and thermogravimetry coupled time-resolved mass spectrogram (TG/MS). The resulting polymers exhibited relatively high Tg because of the existence of a rigid naphthalene moiety. Then closed microcellular porous membranes with a wide range of expansion ratio (ER) were obtained by a simple thermal treatment from 140 °C to 280 °C for 60 seconds, without using any other physical or chemical foaming agents. The highest ER was 53.98%. This method has never been reported before on high-performance poly(aryl ether) materials. Furthermore, we investigated the relationship between the foaming temperature and the morphology of membranes in detail by using density measurement and scanning electron microscopy (SEM).
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 7
·880-887
·
IF 2.016
Chen Sen-He,Wu Bai-Heng,Fu Jin-Cheng,Wang Guo-Jun,Wan Ling-Shu,Xu Zhi-Kang
Polystyrene membranes with precisely controlled and vertically oriented pores are fabricated by a bidirectional freezing process. In this process, the influence of polymer in growth of diphenyl sulfone (DPS) crystals has been demonstrated by XRD and simulated by DFT based on the interaction between DPS crystal faces and polystyrene (PS). The influence of temperature gradient on membrane structures is also elucidated. Compared to the original membrane and modified traditional membranes, modified PS membranes with vertically oriented pores show large and stable fluxes in the processes of multiple oil and water separation.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Chen Xiuling,Chen Guining,Xie Cong,Wu Lei,Liu Gongping,Li Nanwen,Jin Wanqin
High-performance gas separation membranes have potential in industrial separation applications, while overcoming the permeability-selectivity trade-off via regulable aperture distribution remains challenging. Here, we report a strategy to fabricate Polyolefin Reweaved Ultra-micropore Membrane (PRUM) to acquire regulable microporous channel. Specifically, olefin monomers are dispersed uniformly into a pristine membrane (e.g., PIM-1) via solution diffusion method. Upon controlled electron beam irradiation, the olefin undergoes a free radical polymerization, resulting in the formation of olefin polymer in-situ reweaved in the membrane. The deliberately regulated and contracted pore-aperture size of the membrane can be accomplished by varying the olefin polymer loading to achieve efficient gas separation. For instance, PIM-1 PRUM containing 27 wt% poly-glycidyl methacrylate demonstrate CO 2 permeability of 1976 Barrer, combined with CO 2 /CH 4 and CO 2 /N 2 selectivities of 58.4 and 48.3 respectively, transcending the performance upper bounds. This controllable and high efficiency-design strategy provides a general approach to create sub-nanometre-sized pore-apertures of gas separation membranes with wide universality.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）