Desalination and Water Treatment
·
2024
·
IF 1
Rui Zhang,Jingjing Xue,Yuan Li,Bing Cao,Pei Li
To suppress pore collapsing and selective layer thickening of Poly (pyromellitic dianhydride-co-4,4’-oxydianiline) (PMDA-ODA) nanofiltration (NF) membrane during imidization, we proposed a novel two step method. Specifically, a PMDA-ODA polyamic acid (PAA) polymer dope was cast on top of a non-woven polyester fabric and then underwent non-solvent induced phase inversion to form a PMDA-ODA PAA membrane. The membrane was subsequently dried by solvent exchange and chemically imidized to form PMDA-ODA PI membrane. Compared with the thermally imidized PMDA-ODA PI membrane, which had a thick selective layer of 14.5 μm and pure water permeability of 1.5 L/(m 2 ·h·bar), membrane fabricated using the new method had a thinner selective layer of 1.04 μm and 7 times higher pure water permeability of 10.4 L/(m 2 ·h·bar) without losing rejections. Other than that, the NF membrane also showed good separation properties in organic solvent systems. It showed rejections of 87%~95% to Rose Bengal in DMF, THF, and DMSO, with stable permeabilities of 6.1–8.0 L/(m 2 ·h·bar), at a trans-membrane pressure of 20 bar for at least 24 h. Therefore, the PMDAODA PI membranes had great potential for NF in both water and organic solvent systems.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Baoquan Wan,Haiyu Li,Yunhui Xiao,Shuangshuang Yue,Yunying Liu,Qiwei Zhang
BaTiO 3 (BT) nanofibers with different surface defects were prepared by electrospinning process through controlling the sintering atmospheres (Air, N 2 and H 2 ), and introduced into polyimide (PI) matrix to form composite films. The effects of different surface defects on dielectric and energy storage properties of PI composites were systematically investigated. The results showed that the fabricated composite films under a reducing (H 2 ) atmosphere exhibited excellent dielectric properties, compared with that under Air and O 2 . The dielectric constant (ε r ) of PI composite films with 20 wt% BT-fibers reached up to 17.6, while maintaining lower loss (tgδ = 0.006@100 kHz), which was about four times greater than that of pure PI (ε r = 4.1). When the content of BT-fiber was up to 15 wt%, the composite film exhibited a maximum energy storage density of U e = 6.12 J/cm 3 . These results provide an effective method to tune the dielectric and energy storage properties of ferroelectric/polymer composites.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wenwen Li,Tao Wu,Mengyao Xu,Yingrong Zhong,Xiaoyu Wang,Meng Gao,Guanchen Xu,Yuanyuan Tao,Dongwei Li,Xingshuang Zhang
To meet the dual requirements of particulate and iodine vapor removal in iodine-containing aerosol purification during nuclear fuel reprocessing, a series of PI/COF-316 composite nanofiber aerogels were fabricated via an electrospinning-freeze-drying approach. The thermally imidized PAA nanofibers formed a three-dimensional (3D) porous skeleton, while the uniformly dispersed COF-316 particles provided abundant active sites. PI/COF-25 wt% NFAs achieved the best overall performance, delivering 98.12% filtration efficiency for PM 0.3 with a pressure drop of 140 Pa and an iodine vapor adsorption capacity of 361.36 mg/g. The adsorbed iodine was effectively desorbed using ethanol, and 83.09% of the initial capacity was retained after five adsorption-desorption cycles. These results demonstrate that PI/COF composite NFAs provide a robust platform for iodine-containing aerosol purification. Environmental implication This polyimide/COF-316 nanofiber aerogel enables simultaneous purification of submicron particulates and iodine vapor (a hazardous nuclear-related pollutant) in aerosols. Its recyclability reduces material waste, offering a sustainable, efficient solution for hazardous iodine-containing aerosol control to mitigate environmental and health risks.
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Xun Wang,Yin Qiao,Zesheng Song,Lirong Yang,Yang Yu,Ziye Yu,Chu Zeng,Sitong Peng,Feng Liu
Polyimide (PI) is recognized as a high-performance biomaterial membrane due to its high mechanical strength, excellent biocompatibility, biological stability, and highly tunable chemical structure. However, the intrinsic hydrophobicity of PI blood fluid contact ultrafiltration (UF) membrane materials poses risks related to separation efficiency and stability, as well as complications arising from biofouling and immune cascades. In this study, benzimidazolium-based phosphorylated zwitterionic PI (BI-ZFPI-Me/Et/ i -Pr) polymers were synthesized via polycondensation and phosphorylation using three different reagents (MeOEP, EtOEP, and i-PrOEP). These polymers were then used to prepare intrinsic flat-sheet blood-contacting UF membranes via NIPS. All phosphorylated zwitterionic PI membranes not only exhibited reduced water contact angle (19.8°/17.0°/16.8°vs. 57.2°) but also demonstrated superior UF performance, with FRR values exceeding 93% and cycle stability far surpassing that of the pristine BI-FPI membrane (76.9%). Among the three zwitterionic membranes, BI-ZFPI-Me, due to its optimal hydrophilic-hydrophobic balance, showed excellent hemocompatibility—including a hemolysis rate < 0.5%, high plasma recalcification time (28 min), and anti-complement activation—while BI-ZFPI- i -Pr exhibited the best cell viability (93.3%), enhanced endothelial cell compatibility, and promoted M2 macrophage polarization. This study indicates that intrinsic zwitterionic phosphate polyimides show promising potential in biomaterial separation membranes due to excellent multifunctional biological anti-fouling, anticoagulation, and biocompatibility.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Jingzhou Wu,Mengmeng Li,Yuan Li,Di Wu,Xikai Ma,Jie Dong,Xin Zhao,Jianping Yang,Qinghua Zhang
Thermal protection in confined electronic spaces, particularly within lithium-ion battery packs, faces a persistent conflict: materials must be thin enough to maximize energy density yet robust enough to block heat propagation. To resolve this, we developed a “pearl-chain-embedded” polyimide-silica aerogel membrane via a tailored two-step gelation strategy. By strictly controlling the interfacial chemistry, we employed hydroxyl-containing polyimide chains to establish a dense hydrogen-bonding network with the in situ-grown silica. This molecular-level engineering yields a hybrid membrane that decouples flexibility from thermal stability—retaining mechanical integrity after 1000 folding cycles (bending radius: 3 mm) while suppressing the severe high-temperature shrinkage typical of pure organic aerogels. Critically, in practical safety tests, a layer merely 1 mm thick established a sufficient thermal barrier to block the chain reaction of battery thermal runaway. These findings present a robust pathway for designing ultrathin safety layers in next-generation lithium-ion batteries.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruihan Wang,Nanxi Dong,Guofeng Tian,Gang Liu,Bo Zhou,Shengli Qi,Dezhen Wu
In order to allow polyimide (PI) to resist the erosion of atomic oxygen (AO) in Low Earth Orbit to extend the life of the aircraft, an in-situ precursor network approach was proposed to manufacture the inorganic gradient microstructure across the organic/inorganic transition interface and simplify the process, which create a three-tier microstructure film and lead the dense SiO 2 protective layer firmly grasps the PI film. Benefiting from the integrated structure, SiO 2 -coated PI film shows remarkable surface and interface state after 3000 times mechanical bending, which able to delay the initial AO corrosion caused by the defect of the protective layer, resistance to AO reported as AO erosion yield of 2.39 × 10 −26 cm 3 O atom −1 under 7 × 10 21 O atoms cm −2 AO fluence. This work proposes a novel approach for the fabrication of high-performance and AO resistant PI to enable the aircraft to complete more efficient and highly integrated flight missions and shows great potential in the general preparation of organic-inorganic interface.
研究领域:
高分子材料科学
·
航天材料工程
·
表面与界面化学
·
空间环境效应
·
功能涂层技术
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2028
·
IF 4.6
Chaohua Song,Longfei Peng,Yinhui Li,Yawei Du,Zan Chen,Weixin Li,Cuijia Duan,Biao Yuan,Shuo Yan,Sibudjing Kawi
Novel polymers applied in economic membrane technologies are a perennial hot topic in the fields of natural gas purification and O2enrichment. Herein, novel hypercrosslinked polymers (HCPs) incorporating 6FDA-based polyimide (PI) MMMs were prepared via a casting method for enhancing transport of different gases (CO2, CH4, O2, and N2). Intact HCPs/PI MMMs could be obtained due to good compatibility between the HCPs and PI. Pure gas permeation experiments showed that compared with pure PI film, the addition of HCPs effectively promotes gas transport, increases gas permeability, and maintains ideal selectivity. The permeabilities of HCPs/PI MMMs toward CO2and O2were as high as 105.85 Barrer and 24.03 Barrer, respectively, and the ideal selectivities of CO2/CH4and O2/N2were 15.67 and 3.00, respectively. Molecular simulations further verified that adding HCPs was beneficial to gas transport. Thus, HCPs have potential utility in fabrication of MMMs for facilitating gas transport in the fields of natural gas purification and O2enrichment.Keywords:6FDA-based polyimide;hypercrosslinking polymers;gas transport;molecular simulations
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Shan Zhang,Juntao Wu,Wenhao Liang,Pei-Yan Zhao,Hui-Ya Wang,Yi Cong,Guang-Sheng Wang
With the continuous development of modern electronic technology, it is of great significance to explore materials with flexibility and stable electromagnetic interference shielding (EMI) properties in extreme environments. In response to this, a highly conductive polyimide-Ti 3 C 2 T x MXene-silver nanoparticles (PI-MXene-AgNPs) composite film was prepared by performing a self-reduction reaction on the surface of poly(amic acid) nanofibers . The polyimide nanofibers are wrapped with Ti 3 C 2 T x nanosheets and AgNPs. The film has excellent EMI shielding performance in X-band (8.2–12.4 GHz). When the mass ratio of MXene/AgNO 3 is 4:1, the PI-MXene-AgNPs films have high absolute EMI shielding effectiveness up to 16785.67 dB cm 2 g −1 at a thickness of 30 μ m. The composite film has stable EMI shielding performance even after high (300 °C) temperature, cryogenic (−196 °C), corrosive environment , multiple bending and physical shaking. Furthermore, PI-MXene-AgNPs films exhibit excellent flexibility and superior mechanical properties that can be maintained even after treatment under harsh conditions. In addition, the PI-MXene-AgNPs composite films show good versatility, such as photothermal conversion properties, antibacterial properties . Therefore, this work provides a feasible strategy for the preparation of flexible electronic devices in extreme environments.
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DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Qing Li,Yujuan Guo,Chaoliu Ouyang,Shunmin Yi,Sheng Liu
Polydopamine (PDA), also known as artificial melanin, was adopted as ultraviolet absorbent to prepare a series of porous highly fluorinated polyimide/polydopamine (FPI/PDA) films by cyclodehydration via chemical and thermal imidization. The hydrogen bond and porous structure endowed the reinforced thermal, mechanical, UV-shielding and photostability. The initial decomposition and glass transition temperatures of FPI/PDA (1 wt %) film were as high as 461.5 °C and 341.5 °C, respectively beyond pure FPI by 54.1 °C and 26.0 °C. The stress-strain curves indicated that tensile strength and fracture elongation first increased and then decreased with the increase of PDA content, and reached the maximum at 0.5 wt % PDA content, which were 1.41 and 29.47 times of FPI, respectively. UV–vis transmittance spectra, curcumin photolysis and recyclability measurement confirmed the splendid UV-shielding properties with simultaneous excellent visible light transmittance and durability of porous FPI/PDA film. FTIR and AFM manifested its superior photostability with mild variation in carbonyl absorption peaks and surface roughness after 720 h UV irradiation. The above enhancement mechanisms included synergistic UV absorption of porous FPI and PDA, photothermal conversion in a stable FPI, and PDA's free radical trapping, promoting porous FPI/PDA film as an aerospace UV shielding material.
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DOI
高影响因子
Additive Manufacturing
·
2023
·
IF 11
Jing Zhang,Yaoming Zhang,Liming Tao,Tingmei Wang,Qihua Wang
The incorporation of nanofillers into the entire matrix of polyimide (PI) to improve its tribological properties has been extensively investigated. However, the integrated gradient structure of PI is hardly mentioned due to the limitation of the molding method. Fortunately, the free manufacturing advantages of 3D printing present an opportunity for this. 3D printing PI that simultaneously meets high performance and high shape retention is critical for the tribological process , but it is also extremely challenging. In this paper, a highly soluble polyimide precursor, polyamic acid (PAA), was first obtained by molecular design and simulation calculation. Then 2-(dimethylamino)ethyl methacrylate (DMAEMA) was added to PAA as a rheology modifier and photocrosslinking site to obtain an ink suitable for direct ink writing (DIW) printers. By optimizing the ink formulation, the resulting 3D printed PI has highlighted tensile strength (~126 MPa), outstanding Young's modulus (~3.5 GPa), high hardness (~380 MPa), remarkable thermal stability (T d ~415 °C, T g ~220 °C), low linear shrinkage (11%), and excellent light transmittance and transparency. Furthermore, molybdenum disulfide (MoS 2 ) was selected as the solid lubricant to prepare a PI/MoS 2 composite ink, which realized the integrated printing of PI with different structures. The results show that the 3D printed gradient PI/MoS 2 exhibits a stable/low coefficient of friction (COF) and minimal wear with a 68% reduction in wear rate compared to the 3D printed pure PI.
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Gui Yang,Liangchun Zhou,Xiaodong Zhang,Duo Pan,Mingjie Wang,Shilu Luo,Fengmei Su,Youxin Ji,Chuntai Liu
Polymer composites with excellent thermally conductive, electrically insulating, and thermal resistance proprieties are urgently needed due to the rapid development of modern high-performance electronic devices. In this present study, the highly thermally conductive polyimide/carbonized polyvinyl alcohol (PI/αPVA) composites membrane with continuous fibrillated carbon-base thermally conductive network was prepared by co-electrostatic spinning polyamide acid/polyvinyl alcohol (PAA/PVA) fibers and high-temperature treatment method. The fibrillated αPVA acts as thermally conductive fillers, which was penetrated in the PI fibers constructing continuous thermally conductive networks. The PI/αPVA composites membrane exhibits a high in-plane thermal conductivity (TC) of 2.43 W/(m·K) at 10 wt % αPVA addition, which increases by 1120% compared with that of the pure PI membrane. Meanwhile, the PI/αPVA composites membrane presents excellent thermal management performance for cooling the light-emitting diode (LED) lamp when it was used as a thermal interface material (TIM) in practice. In addition, the volume resistivity of the PI/αPVA composites membrane at 10 wt % αPVA content is about 2.88 × 10 15 Ω cm, indicating that the composites membrane has excellent electrically insulating proprieties. At the same time, the composites show a thermal decomposition temperature of over 400 °C which can be used in high temperature environments. Thus, the proposed strategy is promising for the preparation of thermal management materials with high thermal conductivity, electrically insulating, and thermal resistance proprieties to meet the high heat dissipation demand of the new generation of electronic devices and even special high-temperature thermal management.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yu Zhang,Qiang Gao,Xianzhe Sheng,Shuai Zhang,Junjie Chen,Yan Ma,Jianbin Qin,Yongsheng Zhao,Xuetao Shi,Guangcheng Zhang
The design and fabrication of electromagnetic interference shielding films with a novel structure to eliminate undesirable electromagnetic pollution is an important research direction. However, it is still a challenge to combine and organize nanofillers in different dimensions into the structured network in polymer-based electromagnetic interference (EMI) shielding composites. In this work, a sandwich structure polyimide (PI) composite film with alternative 2D-MXene network and 1D-Silver nanowires (Ag NWs) network was prepared through the “electrospinning-immersion-hot pressing” method. With the increase of Ag NWs content, the EMI shielding effectiveness (SE) gradually increases while maintaining good flexibility and mechanical robustness. The EMI SE and the tensile strength of 150 μm thick sandwich composite film can reach up to 79.54 dB and 39.82 MPa, respectively. The prepared flexible and robust PI composite film with a sandwich structure has high EMI SE with less metal content, which can provide guidelines for the development of high-performance EMI polymeric films with potentials in wearable devices and equipment.
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DOI
高影响因子
危险品化学品经营许可证（带存储）