AICHE JOURNAL
·
2026
·
IF 4.4
Sheng Yuan,Jingqi Fu,Tao Yu,Zhiheng Li,Hanze Ma,Shilin Guo,Quan Zhao,Lixuan Liu,Yuao Dong,Teng Liu,Guangwei He,Zhongyi Jiang
Mixed matrix membranes (MMMs), combining the processability of polymers with the separation performance of fillers, have attracted significant attention for industrial gas separations. Nevertheless, achieving a uniformly distributed, highly connected filler phase remains a major obstacle, limiting the separation performance enhancement of MMMs. Herein, we report a family of preformed covalent organic framework (COF) network-based MMMs, which are fabricated by preforming a continuous COF network followed by infiltration of a polyimide matrix. This preforming-filler-network (PFN) method constructs a three-dimensional (3D) interconnected transport scaffold within the membrane. This unique structure eliminates filler agglomeration, a key challenge that has not been resolved by conventional MMM fabrication methods. Consequently, the membranes achieve a 707.7% enhancement in H 2 permeability (to 366.7 Barrer) and a 121.7% increase in H 2 /CH 4 separation factor (to 100.2) compared to pristine polyimide membranes. The COF-network MMM also exhibits excellent stability and plasticization resistance, further highlighting its potential for real-world hydrogen purification.
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ACS Applied Polymer Materials
·
2026
·
IF 5.2
Haoyu Qi,Yongbin Zhao,Aihua Chen
Sufficient chain entanglements are essential for high-quality fiber membranes via electrospinning. This often requires high polymer concentrations, which result in excessively viscous solutions, hindering processability. Herein, we report a nonsolvent-assisted strategy to enhance chain entanglement and enable electrospinning to form bead-free fiber membranes at low concentrations of poly(amic acid) (PAA), the precursor of polyimide (PI). By incorporating nonsolvents into PAA solutions, binary solvent systems were constructed, which induce polymer chain contraction and strengthen intermolecular interactions, thereby facilitating entanglement networks. Thus, bead-free fiber membranes can be obtained at lower concentrations in an expanded electrospinning window of the PAA solutions. The minimum concentration required for bead-free fibers decreased from 16 wt % in pure DMF to 10 wt % in a binary solvent containing 43% nonsolvent. Increasing the proportion of nonsolvent also leads to an increase in average fiber diameters. The resulting PI fiber membranes exhibited substantially improved mechanical properties, especially in terms of toughness. Furthermore, the PI fiber membranes demonstrated an excellent oil–water separation performance. This work provides an efficient and scalable solvent-based strategy for facilitating the electrospinning of high-performance polymeric membranes with tailored properties.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Yulin Huang,Chao Shan,Xiuyuan Wei,Xiaohua Huang
Mixed-matrix membranes (MMMs) have attracted considerable attention for gas separation because nanoscale engineering of filler structure and polymer/filler interfaces can improve overall separation performance. In this study, a monomer, 4,4′-diamino-4″-dibenzofuran-triphenylamine (DATPA), was synthesized, and a noncoplanar copolyimide was subsequently prepared using DATPA, 9,9-bis(4-amino-3-fluorophenyl)fluorene (FFDA), and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). MMMs were then fabricated by solution blending using Noria as a nanoporous organic cage filler and the copolyimide as the matrix. Owing to the intrinsic subnanometer cavities of Noria and the resulting nanoscale transport features introduced into the membrane structure, the incorporation of Noria significantly enhanced gas separation performance. At a Noria loading of 9 wt %, the permeabilities of He, CO2, O2, and N2 increased by 96%, 134%, 57%, and 41%, respectively, compared with the pure polyimide membrane. Furthermore, at a 6 wt % loading, the ideal selectivities for He/N2 and CO2/N2 reached 77.9 and 26.0, corresponding to improvements of 42% and 57%, respectively. These results demonstrate that nanoporous organic cage incorporation is an effective strategy for tuning membrane microstructure and improving gas separation performance.
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ACS Applied Polymer Materials
·
2026
·
IF 5.2
Hou Tianqi,Liu Xiuli,Liu Xiaowei
Advances in semiconductor materials have placed increasingly
stringent
demands on the reliability of packaging materials for electronic devices.
However, the smooth surface of copper foils and the inherent limitations
of the molecular structure of polyimide (PI) lead to poor interfacial
adhesion between PI and copper foil, thereby posing significant challenges
to packaging reliability. Herein, a chain-end functionalization strategy
is proposed to enhance the interfacial adhesion between PI and copper
foils through the covalent modification of PI with 2-aminobenzimidazole
(2-AB) and 4-(trimethoxysilyl)aniline (4-TMSA). The siloxane and benzimidazole
moieties in the functionalized materials synergistically form covalent
bonds between molecular chain ends and the copper surface, increasing
interactions at the heterogeneous interface. Simulation results reveal
that the chain-end modified groups preferentially migrate toward the
copper region, increasing the interaction range between the molecular
segments and the copper surface. This chain-end functionalization
confers a high peel strength of 0.280 N/mm, a high glass transition
temperature of 381.4 ° C, and a high AC breakdown strength of
345.11 kV/mm, improving the reliability of the packaging material.
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TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Wangfei Shen,Qingzhe Zhang,Yingying Wang,Pu Zhang,Xiaoliang Zhang,Chunxia Wu,Cunxin Jia,Jingkang Liu,Xudong Xue,Yanming Wang
Two-dimensional lubricating fillers play a crucial role in strengthening the tribological performance of polymer coatings. In this study, MXene-PDA-Bi 6 O 7 (MXene/Bi 6 O 7 ) heterostructured composite nanofillers were prepared via a mussel-inspired chemical method. Polyimide (PI) composite coatings with varying MXene:Bi₆O₇ mass ratios were fabricated, and their microstructure, mechanical properties, and tribological performance were systematically characterized. The loading of Bi 6 O 7 nanoflowers onto the surface of PDA-modified MXene was achieved through in situ assembly, resulting in the formation of MXene/Bi 6 O 7 heterostructures. The experimental results demonstrated that the synergistic effect of MXene and Bi 6 O 7 significantly enhanced the properties of the PI composite coatings. Specifically, when the MXene-to-Bi₆O₇ mass ratio was 4:6, the PI composite coatings exhibited an 11.2 % reduction in friction coefficient and a 70.5 % decrease in wear rate compared with pure PI. Additionally, the tensile strength of the PI matrix was increased to 185.99 MPa. The MXene/Bi 6 O 7 heterostructure effectively reduced direct contact between the friction pairs by forming a dense transfer membrane, thereby maintaining stable lubrication performance under a broad range of conditions. The study elucidates the role of two-dimensional heterostructures in enhancing the interfacial mechanics and tribological properties of polymers, providing theoretical guidance and technical routes for the development of high-performance abrasion-resistant polymer coating materials.
研究领域:
材料科学
·
摩擦学
·
纳米复合材料
·
聚合物涂层
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 38
·e05310
·
IF 2
Deyu Yi,Zhongliang Zuo,Kai Wang,Ruochen Pan,Xiaomeng Chu,Zhi Li,Shaojie Liu,Zhenhua Shang
The transparent flexible substrate is vital for flexible displays, acting as both a carrier and a support. This study presents a molecular design strategy to enhance the optical and dielectric properties of colourless polyimide (CPI) films by incorporating flexible alkyl segments. First, we designed and synthesized three diamine monomers with varying alkyl chain lengths, and then polymerized them with commercially available 6FDA (2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride) via solution polycondensation to produce a series of colorless polyimide films. To further fine-tune the material properties, controlled copolymerization with fluorinated diamine TFMB (2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl) was performed, resulting in advanced CPIs with superior optical clarity and dielectric properties (ε = 2.8 ∼ 3.5, tanδ = 0.01 ∼ 0.02 at 1 MHz). The TDA-CPI-2 film (18 µm) demonstrated high optical transparency ( T 400 = 82.9%, haze = 0.28, YI = 0.73) with a UV cut-off at 340 nm. It exhibited low water absorption (1.89%) and a hydrophobic surface (contact angle of 80.84°), ensuring stable dielectric performance under varying humidity conditions. The film maintained excellent thermal ( T g = 172.4 °C, Td5% = 491.4 °C) and mechanical properties (tensile strength of 74.5 MPa, modulus of 1.37 GPa), while being solution-processable for practical applications. This work offers a versatile approach to developing high-performance CPI films for advanced optoelectronic flexible display devices. Graphical The three series of transparent and colorless polyimide films (EDA-CPI-X, HAD-CPI-X, TDA-CPI-X) exhibit exceptional optical clarity and outstanding dielectric properties (dielectric constant ε = 2.8~3.5, dissipation factor tanδ = 0.01~0.02 at 1 MHz).
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Yanqing Wang,Zengqi Zhang,Lintao Dong,Yongcheng Jin
Polydopamine (PD) for polyimide (PI) separator coated-modification is investigated for lithium-sulfur (Li–S) battery. The asymmetric single-sided PI-PD separator is achieved by in-situ self-polymerization. According to testing, batteries obtain the best performances when PD loading is 0.8 mg cm −2 . Li–S battery with PD as a separator coating shows excellent electrochemical performance and high security. At 0.5C, battery with PI-PD obtains an initial discharge specific capacity of 1404.7 mAh g −1 , and it can be retained at 890.5 mAh g −1 after 100 cycles. A high specific capacity of 710 mAh g −1 is obtained at 5 C. The PD modified layer possesses abundant N, O-containing functional groups which has strong chemical adsorption with the polysulfides . At the same time, the PD layer formed on PI is a dense layer which can be used as a physical barrier. That means polysulfides can be effectively suppressed by both chemical adsorption and physical obstruct in batteries with PI-PD separators. Besides, the PI-PD separator improves the safety of battery because the thoroughly thermal runaway temperature of battery with PI-PD can be as high as 300 °C. Therefore, the introduction of PD as a material for coated separator is a promising method using in Li–S battery.
研究领域:
材料科学
·
电化学
·
能源存储
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Surfaces and Interfaces
·
2023
·
IF 6.2
Chengfeng Xiong,Yu Wang,Liangliang Lin,Ming Gao,Yifan Huang,Paul K Chu
The increasing demand for flexible electronics has spurred the development of flexible substrates with high thermal conductivity . Herein, nanocomposite coatings based on aluminum nitride (AlN) and siloxane matrix are deposited on polyimide (PI) films by atmospheric pressure plasma for improved thermal conductivity. Commercially available aluminum nitride powders are incorporated into methyltrimethoxysilane (MTMS) precursor to form nanocomposite coatings at atmospheric pressure. The evolution of the as-prepared coatings is systematically investigated upon the variations of the deposition time. The smooth surface is transformed into a rough surface with spherical nanoparticles , and the silicon containing functional groups with AlN nanoparticles are introduced into the surface. After 6 min deposition, the surface energies of the PI film can be improved to 32.8 mJ/m 2 , and the thermal conductivity can be enhanced to 1.68 W/mK with a coating hardness of 2H. The results demonstrate that the nanocomposite coatings prepared by plasma deposition are an efficient way to modify flexible materials with improved thermal conductivity.
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Polymers
·
2023
·Vol. 15
·期 12
·2609
·
IF 5
Shuhuan Yun,Xianzhe Sheng,Shengli Wang,Xing Miao,Xuetao Shi,Yongsheng Zhao,Jianbin Qin,Guangcheng Zhang
Polyimide foam (PIF) is a rising star in high-end applications such as aerospace thermal insulation and military sound absorption. However, the basic rule on molecular backbone design and uniform pore formation of PIF still need to be explored. In this work, polyester ammonium salt (PEAS) precursor powders are synthesized between alcoholysis ester of 3, 3′, 4, 4′-benzophenone tetracarboxylic dianhydride (BTDE) and aromatic diamines with different chain flexibility and conformation symmetry. Then, a standard “stepwise heating” thermo-foaming approach is used to prepare PIF with comprehensive properties. A rational thermo-foaming program is designed based on in situ observation of pore formation during heating. The fabricated PIFs have uniform pore structure, and PIFBTDA-PDAshows the smallest size (147 μm) and narrow distribution. Interestingly, PIFBTDA-PDAalso presents a balanced strain recovery rate (SR = 91%) and mechanical robustness (0.051 MPa at 25% strain) and its pore structure maintains regularity after 10 compression–recovery cycles, mainly due to high rigidity of the chains. Furthermore, all the PIFs possess lightweight feature (15–20 kg∙m−3), good heat resistance (Tgat 270–340 °C), thermal stability (T5%at 480–530 °C), thermal insulation properties (λ = 0.046–0.053 W∙m−1K−1at 20 °C, λ = 0.078–0.089 W∙m−1K−1at 200 °C), and excellent flame retardancy (LOI > 40%). The reported monomer-mediated pore-structure control strategy can provide guidelines for the preparation of high-performance PIF and its industrial applications.Keywords:polyimide foams;molecular structures;thermo-foaming;flame retardant;thermal insulation
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Shuyue Pang,Yanhong Li,Xiaofang Chen,Aisheng Huang
The fabrication of mixed matrix membranes (MMMs) by intermixing suitable fillers with organic polymers is an effective strategy to surmount the well-known trade-off effect between gas permeability and selectivity, which can promote separation performance of membranes to a great extent. Two-dimensional (2D) metal-organic frameworks (MOFs) are considered as potential fillers for strengthening the separation performance of MMMs as they possess high aspect ratio and distinctive chemical characteristics. However, it remains challenging in engineering the morphology of the MOFs with desired pore structure and high aspect ratio. In this study, we firstly prepare c-axis oriented ZIF-95 sheets with lateral dimension exceeding 22 μm and thickness of around 3 μm by the solvothermal method. And then the ZIF-95 sheets are incorporated into the polyimide (PI) matrix to fabricate highly c -axis oriented ZIF-95@PI MMMs (denoted as COZIF-95@PI MMMs thereafter). Attributing to the straight permeation channel of ZIF-95 (3.6 Å) for gas permeation as well as its high compatibility with polyimide substrates, the COZIF-95@PI MMMs show a high gas separation capability. At 373 K and 100 kPa for the COZIF-95@PI MMM with 40 wt% loading, the mixture separation factors of H 2 /CH 4 and H 2 /CO 2 are 134 and 58, respectively, and the H 2 permeability exceeds 967 barrer , which is hopeful for the separation and purification of hydrogen.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Xiaofei Wang,Yang He,Xinli Xiao,Jinsong Leng
Shape memory polyimide (SMPI) is one of the most promising intelligent materials and has a high potential for deformable flexible electrodes , intelligent thermal management devices, and high temperature active deployable structures , etc. In this paper, silane-modified AlN nanoparticles (M-AlN) are composited with SMPI matrix resin to prepare fast-response high-T g shape memory composites. Besides, nano-sized AlN and micron-sized Al 2 O 3 are used to construct “micro-nano” synergistic thermal conduction networks, in which the AlN acted as the “thermal conduction island”, and the Al 2 O 3 acted as the “thermal conduction bridge”. The results show that the in-plane thermal conductivity of Al 2 O 3 /M-AlN/M-SMPI-2 is 5.99 W m −1 K −1 , compared with SMPI, its thermal conductivity increases by 91%. In addition, the shape transition temperature of Al 2 O 3 /M-AlN/M-SMPI-2 was higher than that of pure SMPI, which was at 426 °C, and the thermal response shape recovery speed is also greatly improved by 433%, which can be used in rapid-actuating and high temperature active deformation structure .
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POLYMER INTERNATIONAL
·
2023
·Vol. 72
·期 6
·569-577
·
IF 3.2
Weilian Wu,Shiqing Lai,Hongchao Niu,Chanjuan Liu,Zengfang Huang,Li Zhou,Xiaohua Huang
Three novel fluorinated polyimides (PIs) were synthesized via one-step solution polycondensation from a new diamine monomer, 4-(3-methoxy-4-(difluoromethoxy)phenyl)-2,6-bis(4-aminophenyl)pyridine, and three commercially available aromatic dianhydrides. The solubility, thermal, optical, hydrophobic and gas transport properties of the obtained PIs were investigated. The results demonstrated that these polymers present good solubility in dimethylformamide, N -methylpyrrolidone, dimethylsulfoxide, dimethylacrylamide, CHCl 3 , tetrahydrofuran and CH 2 Cl 2 at room temperature or upon heating. Meanwhile, they displayed excellent thermal properties with glass transition temperature of 261–345 °C, weight loss temperatures at 10% of 518–523 °C as well as char yield of 60–62% at 800 °C in nitrogen atmosphere. Furthermore, the PI membranes have good hydrophobic properties with water contact angle value in the range 90.1–92.0°. Moreover, they show excellent optical properties, with cut-off wavelength ( λ cut-off ) values of 368–381 nm and wavelength values at 80% transmittance ( λ 80% ) of 421–462 nm. The pure gas permeabilities of He, CO 2 , O 2 and N 2 of the PI membranes were measured by the method of constant volume–variable pressure. The PI containing 4,4′-(hexafluoroisopropyl)diphthalic anhydride moiety exhibits the largest molecular chain spacing and free volume, giving the best gas transport performance in this work. Molecular simulation results show that the introduction of fluorine-containing structure and bulky pendant into polymer backbones is beneficial for gas transport. © 2023 Society of Industrial Chemistry.
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