JOURNAL OF THE TEXTILE INSTITUTE
·
2025
·
IF 1.5
Fei Yin,He Li,Xinxin Zhang,Roman A. Surmenev,Jianyong Yu,Shichao Zhang
Complex-component oily aerosols are more harmful to health than solid particulates, but current filtering materials are ineffective against high-temperature liquid-phase contaminants, highlighting the need for better purification methods. Herein, polyimide (PI) electrospun nanofiber membranes with spindle-bead structures and electret treatment are developed. The electret in nanofiber membranes captures oily aerosols, while spindle-bead structures create a Laplace pressure gradient that directs oil droplets from fibers to spindle nodes, enabling droplet detachment. The nanofiber filter membranes show stable surface potential (2.05 kV), and superior lipophilicity (dioctyl sebacate [DEHS] wetting time of 6 s), which enable the membranes to achieve efficient filtration of oily aerosols (>99.8%) and low-pressure resistance (∼68 Pa). Moreover, the membranes demonstrate exceptional thermal stability, retaining structural integrity and mechanical properties at 200 °C, making them ideal for high-temperature oily aerosol filtration. This strategy opens up a pathway for the design of high-temperature oily aerosol filtration materials.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Yinfu Luo,Long Ni,Liwei Yan,Huawei Zou,Shengtai Zhou,Mei Liang
This work focuses on the influence of chain structure on properties such as the structural, thermal, morphological, and mechanical properties of polyimide foams (PIFs) which were prepared by polyester ammonium salt powder foaming process. Results showed that the melt viscosity of PEAS is affected by the structure of dianhydrides, which can greatly determine the foaming process, cell structure, and final properties of PIFs. PIF which was derived from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 4,4′-diaminodiphenylmethane exhibited the highest compressive strength (0.374 MPa-RT, 0.194 MPa-200 °C) and compressive modulus (9.24 MPa-RT, 7.37 MPa-200 °C). All PIFs exhibited excellent thermal stability as the initial thermal decomposition temperature reached as high as 544 °C. In addition, the thermal conductivity of the as-prepared PIFs fell in a range of 38–42 mW m–1K–1, which show potential applications in areas of aerospace, aeronautics, marine use, and transportation among others.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 39
·e52936
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IF 3.057
Yingyi Ma,Zian He,Ziwei Liao,Yuhang Han,Junming Zhang,Min Zhu
The dimensional and property stability after heating is considered to be one of the most important properties for low-dielectric-constant materials. Herein, porous structure contained composite PI film with porous PI structure on the surface of a flat PI film was prepared through the simple and low-cost microemulsion method. The introduction of porous coating can significantly improve the dielectric and water resistance properties of PI film, while maintaining its good mechanical properties. More importantly, the porous structures were well preserved after heating, but with the remove of surfactant layer on the inner surface of the pores, leading to lower dielectric constants with 1.06%–3.50% of reduction and lower dielectric losses less than 0.015 with the maintenance of good water resistance and mechanical properties. Excellent durability of the low dielectric constants and low dielectric losses upon high humidity were also shown for the heated composite PI film. In addition, the morphology and properties of the composite PI film both before and after heating could be controlled through varying the fabrication conditions. These results provide valuable information for the construction of the thermally stable low-dielectric-constant material.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chi Zhang,Xue Gao,Jinchao Qin,Qingkai Guo,Haoli Zhou,Wanqin Jin
The treatment of VOCs (volatile organic compounds) in waste streams is very important. Herein, we propose to use a network microporous polyimide (PI) membrane for the molecular sieving of nitrogen over VOC molecules to control their emission. 2,6,14-triaminotriptycene (Trip) was reacted with aromatic dianhydride monomers, such as 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), to synthesize ultramicroporous polyimides, which readily form composite membranes via solution coating. The properties of the PIs were characterized by X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) analysis, etc., which validated the formation of a network structure and ultramicroporosity in these polyimides. Therefore, the outstanding separation performance for the separation of nitrogen over VOCs, such as cyclohexane , by molecular sieving was obtained by using these membranes; a rejection higher than 99 % was realized with a permeability of approximately 2000∼2600 Barrer under a temperature of 25 °C and feed concentration of 30,000 ± 2000 ppm. Finally, the stability of the Trip-BTDA-PI membrane over time was studied.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xin Gao,Jing Niu,Yifei Wang,Yun Ji,Yanlin Zhang
Environmental-friendly solar photocatalytic technology is attracting great attention in the field of pollution control. In this work, novel PO 4 3− -Bi 2 WO 6 /PI photocatalyst achieved high degradation efficiency for tetracycline degradation in simulated solar light (1.6 times kinetic constants of Bi 2 WO 6 ). The photocatalyst could produce more oxygen vacancies as well as more active species O 2 − and OH, and exhibited high mineralization ability, good stability and recyclability simultaneously. After 4 cycles of degradation experiments, its degradation efficiency was only reduced by 8.6 %. Tetracycline molecules gradually became small molecules under the attack of active species. The tetracycline degradation was highly pH-dependent and enhanced with the increase of solution pH. The water quality parameters humic acid and Cl − presented the inhibitory effect, while HCO 3 − can accelerate the tetracycline degradation. The degradation of tetracycline by PO 4 3− -Bi 2 WO 6 /PI conformed to the Z-scheme photocatalysis mechanism, which could effectively broaden the absorption of solar light, improve the separation and transfer of photogenerated electron-hole pairs and extend the lifespan of the photocatalyst.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 70
·57245-57253
·
IF 3.84
Qing Gong,Shiming Gong,Heng Zhang,Lulu Liu,Yinghan Wang
A novel functional diamine containing a triphenylamine moiety and a biphenyl group, N,N-bis(4-aminophenyl)-4-(biphenyl)-4′-aminophenyl ether (N0), was successfully synthesized and characterized. A series of polyimides (PIs) and poly(amic acid)s (PAAs) were synthesized from cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA), 2,2′-bis(trifluoromethyl)-[1,1′-biphenyl]-4,4′-diamine (TFDB), 4-dodecyloxy-phenyl-4′,4′′-diaminotriphenylamine (C12) and the newly synthesised diamine monomer (N0) through a conventional two-step procedure that included a ring-opening polyaddition to give polyamic acids, followed by thermal cyclodehydration. Pretilt angles of a liquid crystal (LC) cell fabricated with the PIs were measured, and the rubbing resistance of PIs containing different sidechain structures was investigated. PI1 with a rigid biphenyl side chain could induce LC parallel alignment after the rubbing process. Although PI3 containing a flexible alkyl side chain could induce LC vertical alignment before the rubbing process, it only induced LC parallel alignment after the rubbing process. However, PI2 containing both rigid biphenyl side chains and flexible alkyl side chains could induce LC vertical alignment before and after the rubbing process. A new method for improving the rubbing resistance of PIs and a generation mechanism of rubbing resistance have been proposed. In addition, all PI films showed high thermal stability and high transmittance in the wavelength range of 400–700 nm.
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 4
·3303-3311
·
IF 2.22
Xu Renxin,Ma Jiali,Zhou Rui,Sun Huajun,Xu Dewen,Zeng Zhe
Polyimides (PIs) and their composites hold promise as low-cost alternatives to conventional ceramic-based dielectrics. Nevertheless, they are far unsatisfactory for practice applications, mainly resulting from the low interfacial compatibility between PI matrices and inorganic fillers. Herein, black phosphorous (BP) nanoflakes/PI composite films with outstanding dielectric and mechanical properties were fabricated via an in situ polymerization pathway. Owing to the hydrophilic surface of BP nanoflakes resulting from slight oxidation during fabrication, the robust noncovalent interaction between BP and PI can be formed, leading to good interfacial compatibility between the two domains and thus well dispersion of BP in PI. Even with a low BP content of 2 wt%, the composite can reach a high-permittivity value of 8.6 at 10 2 Hz and a low dielectric loss value of 0.02. Moreover, the BP/PI composite films inherited the good mechanical performance of PI matrix due to homogeneous dispersion and low loading of BP.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Pengyu Zhou,Yaozhong Liao,Xiongbin Yang,Yiyin Su,Jianwei Yang,Lei Xu,Kai Wang,Zhihui Zeng,Li-min Zhou,Zhong Zhang,Zhongqing Su
Targeting for flexible, broadband ultrasound sensors, a new breed of nanographene platelet (NGP)/polyimide (PI) film is inkjet printed with morphologically optimized NGP/poly (amic acid) hybrid-based nanocomposite ink. The ink is produced with high-shear liquid phase exfoliation from inexpensive bulk graphite, manifesting good printability and high graphene concentration as high as 13.1 mg mL −1 . Featuring an ultra-thin thickness (∼1 μm only), the inkjet-printed NGP/PI film sensor is demonstrated to possess excellent thermal stability and high adhesive strength reaching the American Society for Testing and Materials 5B level. The highly uniform and consolidated NGP/PI nanostructure in the sensor enables the formation of π-π interaction between NGPs and PI polymer matrix , and the quantum tunneling effect is triggered among NGPs when ultrasound traverses the sensor. This sensing mechanism endows the NGP/PI sensor with good sensitivity, fidelity and accuracy, showing comparable performance as prevailing commercial ultrasound sensors such as piezoelectric sensors. The film sensor has a proven gauge factor as high as 739, when sensing ultrasound at 175 kHz, and an ultrabroad responsive spectrum up to 1.6 MHz.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
He Bai,Yunting Hu,Yongliang Zhao,Xiaomin Zhu,Jianhua Hu,Haitao Wang
Aromatic polyimide is widely used in microelectronics as dielectric packaging layers. There is a high demand to reduce its dielectric constant to meet the fast development of communication technology. Here we report a simple and eco-friendly approach to preparing polyimide films with a lowered dielectric constant by adding silica hollow nanospheres with an average size of 100 nm in an aqueous solution of poly(amic acid) salt, and subsequent film casting and thermal imidization. The silica hollow nanospheres present a uniform distribution in polyimide matrix after surface modification with 3-aminopropyltriethoxysilane. The dielectric constant of the resulting composite films decreases linearly with particle loading till 15 wt% and reaches the lowest value of 2.5. The surface hardness and elastic modulus of the films improve by adding hollow nanospheres, while maintaining high optical transparency, high flexibility and a low coefficient of thermal expansion.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Yanming Wang,Yao Wang,Bihai Su,Feibo Li,Linlin Shi,Xiaojing Wang,Lingwei Li,Jiale Zhao,Tianlong Wang,Ping Li,Xiaoliang Zhang,Jingbo Mu,Gai Zhao,Yu Dong
Proton exchange membrane (PEM) is widely implemented as a pivotal component in fuel cell technology. However, cost-effectiveness and complex preparation protocols of commercial PEMs remain major challenges for PEM applications. In this paper, a variety of sulfonated polyimide (SPI) composite films filled with ionic liquids @ molybdenum sulfide (ILs@MoS 2 ) are prepared, which simultaneously yield superior proton conductivity and reduced pollution with feasibility. It is found that with increasing the ILs@MoS 2 ratio, composite films with an ILs@MoS 2 content of 1.5 wt% exhibit a significant improvement of 68 % in proton conductivity, increasing from 0.0778 to 0.1308 S/cm at 80 °C under 100 % relative humidity (RH). This result is believed to be partly attributed to the presence of the dense network of active sites and hydrogen bonds promoted by ILs@MoS 2 . Overall, SPI composite films modified by ILs@MoS 2 demonstrate potential as alternatives for applications in PEM technologies.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 24
·16828-16834
·
IF 3.9
Hangdong Chen,Xun Sun,Ying Wang,Lixian Shi,Xuan Liu,Nantao Hu
Particulate air pollution is a global environmental problem, with PM2.5 being the primary pollutant. One of the most effective ways to remove particles from the air is through filtration. Therefore, high-performance air filters are urgently needed to combat the harm caused by PM2.5. This study uses an electrospinning technique to prepare high-efficiency polyvinylidene fluoride/graphene oxide/polyimide nanofiber membranes. These composite nanofiber membranes demonstrate high filtration efficiency (99.6%), low pressure drop (123 Pa), remarkable thermal stability (450 °C), and excellent mechanical strength (7 MPa). Considering the advantages, these highly efficient nanofiber membranes can find advanced applications in industrial and civil infrastructures.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jing Yan,Kaibo Wang,Yaqian Wang,Mengdie Lv,Guang Yang
The triboelectric nanogenerator (TENG) has been considered as an effective way to convert various mechanical energies into electrical energy. However, the energy output needs continuous improvement for potential applications. In this study, triboelectric layers composed of polyimide (PI) matrix and carbon nanotube@barium titanate (CNT@BTO) nanoparticles were developed to achieve the performance enhancement through the synergistic coupling of piezoelectric and triboelectric effects as well as the microcapacitor function. To achieve the purpose, CNT@BTO nanoparticles were synthesized by the chemical vapor deposition method and then incorporated into a flexible PI triboelectric layer prepared using electrospinning technology and thermal imidization. The results showed that when the BTO content was 26 wt % and the CNT content was 2 wt %, the open-circuit voltage and short-circuit current of a TENG based on a PI/CNT@BTO nanofiber membrane reached 305 V and 104 μA, which were 3 times higher than those of a pure PI-based TENG. The TENG demonstrated sufficient power to drive small electronic devices, such as calculators, and to light up 124 commercial green LED and 18 blue COB light sources. Additionally, the TENG was integrated into a real-time temperature-sensing alarm system, showcasing its potential application in safety-related fields. The study demonstrated the feasible methods for TENGs’ performance enhancement and provided potential application fields of energy-harvesting and self-powered sensing systems.
研究领域:
材料科学
·
纳米技术
·
能量转换
·
传感器
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DOI
高影响因子
危险品化学品经营许可证（带存储）