INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Shuhuan Yun,Xianzhe Sheng,Weiran Tang,Handong Luo,Zhonglei Ma,Guangcheng Zhang
Lightweight, high-temperature resistant copolymerized polyimide foams (CPIFs) were fabricated via a “stepwise heating-holding” thermal foaming process using 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA) and 2,3,3′,4′-biphenyltetracarboxylic dianhydride (α-BPDA) as codianhydrides and p-phenylenediamine (PDA) as the diamine. Asymmetric α-BPDA rigidifies molecular chains to endow superior thermal resistance. The CPIFs possess a three-dimensional open-cell structure (open-cell content >99%), ultralow densities (<10 kg·m–3), excellent heat resistance (Tg ranging from 373.8 to 405.6 °C), and high thermal stability (T5% > 588 °C), substantially outperforming previously reported counterparts. Benefiting from the unique cellular architecture, the CPIFs exhibit thermal conductivities below 0.06 W·m–1·K–1 at room temperature and approximately 0.08 W·m–1·K–1 at 200 °C, and excellent sound absorption (NRC ≥ 0.4), along with outstanding flame retardancy (LOI > 44%, UL-94 V-0 rating). Moreover, the CPIFs remain flexible and thermal insulating even in liquid nitrogen. This work provides a robust strategy for high-performance polyimide foams integrating heat resistance, flexibility, thermal insulation, and acoustic absorption, promising for aerospace and extreme-environment applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Zeyu Li,Desheng Kong,Shun Shi,Tong Yuan,Jianfeng Qian,Jiaojiao Ma,Haiquan Guo
To address the current challenge in advanced packaging technology where it is difficult to simultaneously achieve multiple outstanding properties in photosensitive polyimide (PSPI) structural designs. This work designed a low dielectric constant (Dk), low coefficient of thermal expansion (CTE) negative-photosensitive polyimide with water-based development capable of low-temperature curing. The method achieves low Dk (minimum ε < 3.0 at 10 GHz) and low CTE (minimum CTE as low as −3.23 ppm/K) by introducing a fluorinated rigid backbone structure into the polyamide ester (PAE, PSPI precursor) main chain. Simultaneously, photosensitive groups and water-soluble quaternary ammonium groups were incorporated into the side chains to enable high-resolution aqueous development (up to 4 μm). Quaternary ammonium salts degrade into tertiary ammonium during the imidization stage, which can further catalyze the low-temperature thermal imidization of PAE. Side chains degrade and vanish during imidization while preserving the polyimide backbone’s superior properties. This method achieves the synthesis of PSPI with multiple outstanding properties through sophisticated molecular structure design. This passage tackles the existing bottlenecks in PSPI performance stemming from structural limitations, aligns with the evolving requirements of cutting-edge packaging technologies, and showcases remarkable promise for future applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Fangchao Liu,Dandan Li,Yangyi Cai,Guangtao Qian
High-performance polyimide (PI) films are highly valued for their exceptional comprehensive properties and are considered promising candidates for industrial production and application as optically transparent polymer materials. In this study, we introduced an asymmetric benzimidazole structure functionalized with amide groups via molecular engineering. The key molecular innovation lay in the synergistic integration of both benzimidazole and amide functionalities within the diamine (ABZ) skeleton. This design incorporated bulky side groups to reduce interchain packing efficiency, which enhanced solubility and processability, while the rigid biphenyl moieties helped offset any potential loss of thermal stability resulting from the disrupted chain packing. The diamine monomer was copolymerized with cyclobutane-1,2,3,4-tetracarboxylic dianhydride and 1,2,4,5-cyclohexane tetracarboxylic dianhydride via a high-temperature one-step method to produce novel PI films. The resulting materials retained high thermal stability ( T d5% > 424°C) and demonstrated significantly improved overall performance with low coefficient of thermal expansion (29.5 ppm K −1 ), high optical transmittance (68% at 400 nm), and high glass transition temperatures ( T g > 359°C). They also exhibited excellent mechanical properties (tensile modulus E > 3.5 GPa, tensile strength σ > 137 MPa) and good solubility in common organic solvents. This strategy achieved an optimal balance between optical transparency, thermal stability, and mechanical performance, facilitating the development of high-temperature-suitable CPIs for next-generation flexible electronics. Graphical Balancing Optical Transparency and Coefficient of Thermal Expansion in Novel Polyimide Films.
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Mingwei Cai,Fuhui Liang,Fudong Deng,Baisheng Liang,Shiyang Zhang,Yonggang Min
Helium extraction from natural gas demands ultra-high He/CH 4 selectivity (>1000), yet this benchmark remains largely unmet by polymeric membranes due to the permeability-selectivity trade-off and the challenge of constructing sub-4 Å sieving channels. Here, we report an orthogonal light–heat dual-crosslinking strategy to program the free-volume topology of polyimide membranes. A photoreactive precursor (6FCC-X) was synthesized via a click reaction by incorporating photosensitive units (C═C─S) and varying amounts of thermally labile─COOH groups into the backbone. UV irradiation first triggers [2+2] cycloaddition to construct a dense and uniform super-crosslinked network, which defines the primary molecular-sieving framework. Subsequent thermal decarboxylation generated rigid biphenyl linkages that are proposed to function as molecular-strut-like structural motifs, enhancing chain rigidity, improving micropore connectivity, and refining sub-4 Å sieving constrictions. This sequential topology programming decouples helium transport from methane exclusion, which enables the optimized 6FCC-3-CR membrane to achieve a He permeability of 33.9 Barrer and an exceptional He/CH 4 selectivity of 3767, outperforming most reported polymer-based membranes and rivaling advanced carbon molecular sieve membranes. This work establishes a molecular-strut-mediated topology-programming principle for polymer molecular sieves, offering a general route to reconcile fast transport with precise molecular exclusion.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tianyong Zhang,Junjun Lin,Hongli An,Shuang Jiang,Bin Li
Composite material (PGPI) of polyimide (PI) modified by C.I. Pigment Green 8 (PG8) were prepared by solid-phase thermal polycondensation, impregnation and thermal treatment. The introduction of PG8 enhanced the π-π stacked crystalline structure and the visible light absorption of PI. The photo-Fenton synergistic system can effectively increase the decomposition efficiency of H 2 O 2 , accelerate Fe 2+ /Fe 3+ cycling and reduce the recombination of photogenerated carriers. The synergistic oxidative removal of TH (Tetracycline hydrochloride, 50 ppm) by PGPI after 40 min under visible-light irradiation was 95.1 %, which was significantly better than that of the photocatalysis alone (40.7 %) and the Fenton reaction alone (55.0 %).
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Zitian Liu,Xuesong Deng,Ligang Lin,Rongrong Qiang,Qiying Wang,Qi Cheng,Jing Yang,Xu Yang,Wensong Ma,Xinyang Li,Meina Xu,Chunhong Wang,Qingping Xin,Kongyin Zhao
Efficient separation of dyes and salts from textile wastewater is still a great difficulty. Herein, a tris(hydroxymethyl) aminomethane (Tris)-modified polyimide (PI) membrane was developed, which was effective, easy-to-fabricate, and versatile with high-separation-selective performance. With the introduction of Tris, the roughness, hydrophilicity and negative zeta potential of the membranes were increased, and the pore size was reduced. At 3 bar, the representative membrane exhibited high permeate flux (176–206 L·m −2 ·h −1 ) and high rejection (>97 %) to four common dyes and excellent solvent resistance to seven organic solvents, indicating that PI/Tris membrane had potential for application in dye wastewater containing complex organic solvents. Furthermore, the PI/Tris-modified membrane could selectively separate dyes and salts, and presented high dye rejection (>99 %) and low salt rejection (≈7 %) as well as high selectivity (separation factor = 103) for Direct Black 38/NaCl mixture. In particular, the PI/Tris-modified membranes outperformed many contemporary separation membranes in terms of separation efficiency of dye/salt mixtures. In summary, this PI/Tris membrane developed in this study has a promising future in the field of industrial dye wastewater treatment .
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2022
·Vol. 18
·期 3
·e202201130
·
IF 4.839
Yuhang Han,Yingyi Ma,Junming Zhang,Shun Yao,Kaizheng Xu
Graphical Enhancing the low-dielectric, water resistance and mechanical properties of PI film through integrating GO and a sandwich-type porous structure was achieved. Simultaneous improvement in dielectric, water resistance and mechanical properties of polyimide (PI) films is critical for their practical use, but difficult to achieve. Herein, a sandwich-type porous GO/PI film with excellent comprehensive properties was obtained through integrating a GO-containing complex, fluorine-containing porous structure and sandwich-type distribution of porous structure by a simple, low-cost and green breath figure method. With the addition of only a small amount of GO-containing complex, a low dielectric constant of 2.21, water absorption of 0.51%, increment in dielectric constant after moisture treatment of 1.60% and high tensile strength of 113.1 MPa, tensile modulus of 1.70 GPa, with 35.39%, 79.42%, 81.81% of reduction and 17.22%, 21.43% of increase compared to PI film were shown, respectively. Moreover, these properties could be adjusted through regulating the component and porous structure by changing the parameters of breath figure method. These outstanding properties make the film a promising candidate for high-performance low-dielectric materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 3
·1577-1588
·
IF 2.779
Zhang Xiwen,Zhang Bin,Sun Mingming,Li Jianhui,Liu Caizhao
Polyimide composites have high thermal conductivity and maintain their processability and temperature resistance under low filler loading, which are essential conditions as high-power microelectronic packaging materials. We have prepared thermally conductive and high-temperature resistant copolyimide composite films by in situ polymerization. The multi-walled carbon nanotube-reinforced phase decorated by silver nanowires was homogeneously dispersed in polyamide acid solution during the in situ polymerization process due to the good dispersion of AgNWs-decorated MWCNTs filler in the matrix and the bridging action of AgNWs, thus, forming thermal transfer networks in the composites. Consequently, thermal conductivity of 0.4426 W/m·K was achieved with only 3.0 wt% addition, while the glass transition temperature (T g ) and heat-resistance index (T HR ) were increased to 295.65 °C and 297.88 °C. This method is simple, efficient, and environmentally friendly, and it can achieve simultaneously the formation of AgNWs and inter-decorated carbon nanotubes, which eventually realized well-dispersed matrix and prepared thermally conductive composites.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Xinyu Yao,Xianbo Hou,Rubing Zhang
Oil-water separation materials have been widely studied, however, these materials are mainly used to separate light oil-water mixtures, and the application of heavy oil separation and recovery is rarely involved. It is urgent to develop novel multi-functional oil-water separation materials, especially for the separation membrane for heavy oil. Herein, mechanically robust fiber-reinforced fluorinated polyimide foam membranes (FPIFMs) with adjustable multistage pore structure and high oil-water selectivity were prepared by freeze-drying and surface modification. FPIFMs exhibit high tensile strength of 3.80 MPa with the synergistic effect of PI fibers and PAA . Besides, the macro void structure of the foam membrane can be precisely adjusted to achieve the separation of different types of oil-water mixtures, oil-water emulsions, especially the separation and recovery of heavy oil. The results show that the foam membranes can separate light oil (26935L·m −2 ·h −1 ), oil-water emulsion (364L·m −2 ·h −1 ) and heavy oil (30L·m −2 ·h −1 ) under gravity. This stable, highly flexible, highly efficient and reusable foam membrane is an attractive option for oil spill treatment and wastewater purification.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Yan Du,Xiaohui Yan,Yuanbo Chen,Yi Wu,Qiankun Qiu,Yanshuo Li,Dapeng Wu
Magnetic polyimide nanosheet microspheres (PI-NMs) were used for magnetic solid-phase extraction (MSPE) for the first time. The PI-NMs were modified with magnetic Fe 3 O 4 nanoparticles by chemical coprecipitation to produce the PI-NM/Fe 3 O 4 composite. The prepared composite possessed a nanosheet structure, large specific surface area (71.5 m 2 /g), high saturation magnetization (19.1 emu/g), large adsorption capacity (≥ 676 ng/mg for selected estrogens), and good extraction stability (> 10 times). Trace estrogens in environmental water and urine samples were extracted by the PI-NM/Fe 3 O 4 composite, desorbed, derivatized, and analyzed by gas chromatography–mass spectrometry (GC-MS). The derivatization, extraction, and desorption conditions were optimized. Extraction equilibrium was achieved within 1 min due to the good dispersibility and large specific surface area of the PI-NM/Fe 3 O 4 composite. Under the optimized conditions, the MSPE/GC–MS method validation results showed wide linearity (0.02–50 µg/L or 0.05–50 µg/L), high determination coefficients ( R 2 ≥ 0.9983), good intraday and interday precisions (expressed as relative standard deviation, RSDs ≤ 8.2%), and low limits of detection (LODs, 0.001–0.015 µg/L). For the real environmental water and urine samples, the recoveries and RSDs were 77.0–112.5% and 0.1–10.7%, respectively. The performance of the MSPE/GC–MS method proved that the PI-NM/Fe 3 O 4 composite was a good alternative material for the extraction of organic pollutants in aqueous samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Science
·
2022
·Vol. 10
·期 15
·4243-4256
·
IF 7.59
Rames Kaewmanee,Fan Wang,Yongkang Pan,Shiqi Mei,Jirut Meesane,Fengqian Li,Zhaoying Wu,Jie Wei
Implanted materials with both osteogenic and antibacterial functions are promising for facilitating osteointegration and preventing infection for orthopedic applications. In this work, we synthesized flower-like molybdenum disulfide (fMD) submicro-spheres containing nanosheets, which were incorporated onto the microporous surface of polyimide (PI) via concentrated sulfuric acid, suspending fMD contents of 5 wt% (SPM1) and 10 wt% (SPM2). Compared with sulfonated polyimide (SPM0), both SPM1 and SPM2 with microporous surfaces containing fMD exhibited nano-submicro-microporous surfaces, which improved the surface roughness, wettability, and surface energy. Due to there being more fMD submicro-spheres on the microporous surface, SPM2 revealed a better antibacterial effect than SPM1. In addition, compared with SPM1 and SPM0, SPM2 with more fMD significantly promoted rat bone marrow-derived stromal cell response in vitro. Moreover, SPM2 remarkably enhanced new bone formation and osteointegration in vivo. In summary, the combination of fMD with the microporous surface of SPM2 resulted in a nano-submicro-microporous surface with optimized surface performance, which possessed not only osteogenic bioactivity but also an antibacterial effect. As a bone implant, SPM2 with osteogenic and antibacterial functions may have enormous potential as a bone tissue substitute.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 10
·939-948
·
IF 2.213
Wu Yi,Zhong Dongdong,Qiu Qiankun,Yan Xiaohui,Wu Dapeng
In this work, nanoporous polyimide (PI) microspheres (NPMs) were prepared in bulk using the spray phase inversion technique. Due to the right size and shape, open nanopores with diameters of 10–70 nm, a large surface area of 52 m 2 g −1 , and abundant chemical extraction property, these NPMs were successfully used as solid phase extraction (SPE) sorbents. Combined with an ultra-performance liquid chromatography-fluorescence detector (NPM-SPE-UPLC-FLD), five fluoroquinolones (FQs) were quantified successfully in environmental water and food samples. After the NPMs with 50–75 μm diameters were collected by sieving, packed into an SPE cartridge, and conditioned by rinsing with acetonitrile and water, FQs in water samples were extracted and eluted with high recoveries between 75.5% and 112.3%. A breakthrough volume of 380 mL was obtained with only 20 mg of NPM sorbents. Under optimal conditions, the limits of detection for FQs in spiked purified water were 0.002–0.011 μg L −1 , and the linear range was more than three orders of magnitude (0.004–10 μg L −1 ) with good correlation coefficients of 0.9984–0.9996. The intra-batch relative standard deviations (RSDs) of the NPMs were 0.5%–9.8%, and the inter-batch RSDs were 1.6%–13.4%. Finally, the NPM-SPE-UPLC-FLD method was successfully applied to water, egg and milk samples. These results demonstrated that NPMs are promising candidates for SPE sorbents due to their convenient preparation and excellent performance in environmental water and food samples. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）