MOLECULES
·
2023
·Vol. 28
·期 14
·5523
·
IF 4.6
Qing Li,Yujuan Guo,Meijia Wu,Fei Deng,Jieying Feng,Jiafeng Liu,Sheng Liu,Chaoliu Ouyang,Wengui Duan,Shunmin Yi,Guangfu Liao
A series of highly fluorinated polyimide/allomelanin nanoparticles (FPI/AMNPs) films were prepared with FPI as the matrix and AMNPs as the filler. Due to the formation of hydrogen bonds, significantly reinforced mechanical and UV-shielding properties are acquired. Stress–strain curves demonstrated a maximum tensile strength of 150.59 MPa and a fracture elongation of 1.40% (0.7 wt.% AMNPs), respectively, 1.78 and 1.56× that of pure FPI. The measurements of the UV-vis spectrum, photodegradation of curcumin and repeated running tests confirmed the splendid UV-shielding capabilities of FPI/AMNPs films. The enhancement mechanisms, such as synergistic UV absorption of the charge transfer complexes in FPI and AMNPs and photothermal conversion, were the reasons for its exceptional UV shielding. The excellent comprehensive properties above enable FPI/AMNPs nanocomposites to be potential candidates in the field of UV shielding.Keywords:polyimide;allomelanin;mechanical properties;UV-shielding properties;nanocomposite
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Shengguo Zhou,Wentao Li,Wenjie Zhao,Chao Liu,Zhiwen Fang,Xiulei Gao
As one of the youngest graphene derivative, fluorinated graphene (FG) with excellent mechanical strength and lubricity was incorporated into polyimide polymer (PI) to strengthen the comprehensive performance of nanocomposite . This article gives a detailed characterization to investigate the tribological behaviors of PI/FG nanocomposite films under different friction conditions including both of dry sliding and seawater lubrication . Firstly, the chloroform-treated FG was proved to be stably dispersed in the PI matrix . Subsequently, mechanical properties, thermal stability and tribological properties of PI/FG nanocomposite films were greatly improved. Finally, analysis of the reasons for the significant improvement in wear resistance from the viewpoint of thermal, mechanical properties and the evolution of friction products. Meanwhile, the transfer of FG from polymer matrix to frictional duality was revealed during tribological testing. The above results suggest the potential application of FG in the field of reinforcing polymer friction properties.
研究领域:
材料科学
·
高分子材料
·
表面工程
·
摩擦学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2023
·
IF 1.4
Long-De Wang,Ling Tong,Jian-Wei Wu,Jie-Wu Rong,Li Li
Polyurethaneimide prepolymer was synthesized using the synthesized chromophore C containing tricyanofuran, hexafluorodianhydride and phenyl diisocyanate as monomers. Polyimide prepolymers were synthesized using fluorinated aromatic diether dianhydride and fluorinated aromatic diamine as monomers. Polyurethaneimide-polyimide (PUI-FPI) copolymers were then synthesized by a polycondensation reaction of the polyimide and polyurethaneimide prepolymers. The electro-optic (EO) PUI-FPI copolymers had a special segment structure and concentrate the advantages of polyurethaneimide and polyimide. The copolymers exhibited good film-forming properties, high glass transition temperature (Tg =196 °C), and high thermal stability (Td up to 358 °C). The copolymers possessed a high EO coefficient (γ33 =72 pm/V) at the 1550 nm wavelength, good long-term electro-poled orientation stability, and low optical propagation loss (1.2–1.4 dB/cm) at 1550 nm. Mach-Zehnder interferometric electro-optic modulators were designed and fabricated using the synthesized copolymer as the waveguide material. The prepared polymer optical waveguide EO modulators showed a good low-frequency electro-optic modulation response. The results showed that the synthesized polyurethaneimide-polyimide copolymers meeted the performance requirements for the preparation of polymeric optical waveguide devices and were suitable as polymeric electro-optic waveguide materials.
研究领域:
高分子化学
·
材料科学
·
电光学
·
光波导器件
·
有机电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 34
·e52799
·
IF 3.057
Wei Jia,Jiang Du,Ming Jiang,Mengying Zhang,Enlin Han,Hongqing Niu,Dezhen Wu
In order to overcome the shortcomings of nanofiber membranes such as low mechanical properties and poor acid resistance, amino-rich functionalized polyimide (PI)-polyethyleneimine (PEI) fibers were successfully prepared in the study. The structure and morphology in each functionalization step were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), static contact angle, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The adsorption kinetics analysis showed that the adsorption process followed a pseudo-second-order model, and the adsorption isotherm could be described better by the Langmuir model indicating the adsorption process was mainly chemical and homogeneous monolayer adsorption. Furthermore, the maximum adsorption capacity based on the Langmuir model was about 50 mg g −1 , and the calculated thermodynamic parameters demonstrated an endothermic process. Meantime, the PEI-grafted PI fibers also exhibited good regeneration performance and stable tensile strength during recycling tests process. In the first 3 adsorption–desorption cycles, the removal efficiency and tensile strength of PI-PEI fibers could be maintained up to 60.44% and 89.29% of the initial adsorption, respectively. This work achieved the function of removing Cr (VI) by combining the excellent high temperature resistance, acid resistance, and mechanical properties of PI fibers.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2026
·
IF 3.6
Gaojun Liu,Zilin Zhang,Tingguo Yan,Pingchuan Ma,Yaozong Bai,Yajun Zhang,Guang Cheng
The ANF (aramid nanofiber)-coated separator possesses enhanced thermal stability performance when compared to the polyolefin-based separator. The overly dense nanofiber structure reduces the pore size within the separators and increases the impedance. In this study, the polyimide (PI) was introduced to the ODA-PPTA colloidal solution, and a composed PPTA-PI structure was formed. The averaged pore size within the PPTA-PI coating layer (∼367 nm) was larger than that within the PPTA coating layer (∼260 nm) through the thickness. Similar pore sizes were observed on the coating layer, ensuring a uniform lithium ion flux. Meanwhile, the PPTA-PI-coated separator possesses higher tensile strength and puncture strength. The ionic conductivity increases from 0.74 mS/cm (bare PE separator) to 0.76 mS/cm (PPTA-coated separator) and further to 0.82 mS/cm (PPTA-PI coated separator). The Li + transference number of PPTA-PI-coated separator reaches 0.58, which is higher than 0.45 (PPTA-coated separator) or 0.31 from (bare PE separator). Also, the PPTA-PI-coated separator shows improved capacity retention and lithium dendrite suppression compared to the bare PE and PPTA-PE separator after cyclic tests. Compared to other aramid coating methods, the current approach would enable the mass production of PPTA-PI-coated separator at a lower cost.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaoyi Wei,Zhongliang Yang,Lixiu Zhang,Han Lu,Zhenyu Yin,Ting Li
Polyimide (PI) is a widely used self-lubricating composite material in tribological applications, such as gears and bearings. However, unfilled PI suffers from a high coefficient of friction(COF) and an increased wear rate, which limits its performance in demanding environments. In this study, the development of self-lubricating PI composites was employed by incorporating polydopamine (PDA) modified microcapsules into the PI matrix, with a focus on their tribological behavior. Microcapsules were prepared via solvent evaporation, with polysulfone (PSF) as the wall material. PDA modification of the microcapsules surface was exhibited to enhance thermal stability. The tribological performance of the resulting PI composites was systematically evaluated under varying conditions, including microcapsule contents, load and temperature, using ball-on-disk reciprocating friction test. The results was shown that the PI-based composites with PDA-modified microcapsules was presented the lowest friction and wear rate. The optimal tribological performance was achieved with 12 wt% microcapsules at the load of 30 N. The improved performance was attributed to forming of a lubricating transfer film, facilitated by the controlled release of base oil from the microcapsules during the friction process. Therefore, the developed self-lubricating materials exhibit significant potential for advanced engineering applications, notably where reduced friction and wear resistance are critical.
研究领域:
材料科学
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机械工程
·
聚合物复合材料
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表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2024
·Vol. 66
·期 3
·361-370
·
IF 1
Yawen Guo,Zhao Lielun,Kang Tiantai,Jiang Yan,Zhang Haobin,Zhang Hongwen
In this paper, amino terminated polydimethylsiloxane (APT-PDMS) was synthesized by ring opening reaction of octamethylcyclotetrasiloxane (D4). Then, the slippery liquid infused porous surfaces (SLIPS) of polyimide were prepared from APT-PDMS, 1,2,4,5-cyclohexane tetracarboxylic dianhydride (HPMDA) and 2,2'-bis[4-(4-aminophenoxyphenyl)] propane (BAPP) by two-step method. The composition and structures of products were characterized by Fourier transform infrared spectroscopy (FTIR), the thermal stability of the substrate was studied by thermogravimetric analyzer, the surface morphology and properties of the substrate was observed by scanning electron microscope and Contact angle test. The results show that Slide angle (SA) and stability were the best when the polymer concentration was 30 mg/mL, and the slip angle after oil filling was 3°. Compared with the superhydrophobic surface, the SLIPS own excellent anti-icing and anti-freezing performance, thermal stability, and antibacterial adhesion performance.
研究领域:
材料科学
·
表面工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Hui Zhang,Zhi Xiang,Pengcheng Fang,Shuhuan Zang,Zhengzhi Zheng
This research is dedicated to improving the mechanical properties and thermal stability of epoxy resin modified with polyimide. Two types of imides, along with soluble polyimides incorporating trifluoromethyl and tert-butyl groups, were synthesized as modifiers for epoxy resins. We investigated the effects of imide units with varying structures and soluble polyimides on the mechanical, thermal, and dielectric properties of epoxy resins. The six-membered imide ring demonstrated enhanced thermal stability compared to its five-membered counterpart. The modified epoxy resins exhibited a substantial improvement in mechanical properties, with elongation at break increasing from 6.5% to 11.33%, compared to unmodified ones. SEM images of the fracture surfaces of the modified epoxy resins showed distinct fracture features, which indicated enhanced toughness as a result of the incorporation of imide units. These modified resins also demonstrated excellent thermal stability (with a char yield of 31.5% at 800°C), low hydrophilicity (water absorption ranging from 0.69% to 1.54%, and contact angles between 72° and 85°), and superior dielectric properties (the dielectric constant decreased by 1.95 at 10 3 Hz, while the volume resistivity increased by two orders of magnitude). This research provides new insights into the application of epoxy resins in the aerospace and advanced electronic materials fields.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 6
·1-9
·
IF 2.8
Tian Erlin,Qin Xiaofan,Yan Fufeng,Chen Jing,Dai Haiyang,Xue Renzhong,Zhang Tingting,Li Tao
In this study, five co-polyimide (co-PI) films were synthesized through copolymerization using 6FDA and PMDA as dianhydride monomers paired with ODA diamine. By systematically varying the 6FDA/PMDA molar ratio, we successfully regulated the microstructural characteristics of co-PI films, particularly their free volume and molecular chain rigidity. The structure–property relationships were comprehensively investigated using positron annihilation lifetime spectroscopy (PALS), with special emphasis on thermal, dielectric, and mechanical performance. Notably, the glass transition temperature (Tg) exhibited a progressive decrease from 384.9 ℃ for PI-1 to 307.8 ℃ for PI-5. This thermal behavior is related to the increase of free volume and the decrease of molecular chain rigidity caused by higher 6FDA content. Correspondingly, the dielectric constant ( k ) at 10 4 Hz decreased from 3.55 to 2.46 across the series, demonstrating that enhanced free volume effectively reduces dielectric polarization. However, this microstructural modification came at the expense of mechanical integrity, as evidenced by the descending tensile strength trend with increasing 6FDA proportion. These findings demonstrate an effective strategy for developing high-performance polyimide films combining low dielectric constant with balanced thermal and mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 6
·49801
·
IF 2.52
Fan Zhang,Jinhui Li,Tao Wang,Chao Huang,Fei Ji,Liang Shan,Guoping Zhang,Rong Sun,Ching-ping Wong
Low dielectric constant and low dissipation factor, superior hydrophobicity, excellent thermal and mechanical property, and good optical performance are desired for advanced electronic packaging of fan-out wafer level package (FO-WLP). An effective approach was introduced to fabricate novel fluorinated graphene/polyimide(FG/PI) nanocomposite films in this paper. FG nanosheets exhibit excellent dispersion in the PI matrix due to their high surface area with some oxygen-containing functional groups, and individual graphitized planar structure. Besides, the effects of the addition of FG on the dielectric, optical, mechanical, thermal properties as well as the hydrophobicity of the films are investigated with controlled amounts of FG. The dielectric constant and loss can be as low as 2.64 (at 10 6 Hz) and 0.00176 for PI-0.5wt% FG. And with the increase of the loading of FG, the thermal stability ( T 5 = 514°C) and mechanical property (tensile modulus = 2.11GPa, tensile strength = 93.23 MPa, elongation at break = 11.60%) has been improved successfully. Besides, the contact angles have been increased from 83° to 92° showing a superior hydrophobicity which is essential for the FO-WLP. Moreover, the incorporation of FG also proved excellent optical performance of 88% transmittance at 550 nm. Therefore, with the excellent comprehensive performance, the as-prepared FG/PI films possess widespread applications in the microelectronics especially in FO-WLP.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 15
·5697-5705
·
IF 3.069
Xing Wu,Yan Zhang,Peng Du,Zhengyu Jin,Haichao Zhao,Liping Wang
In this study, in order to achieve good dispersion of graphene in polyimide, graphene nanosheets were edge-aminated with L-phenylalanine (PheG). Then siloxane-capped polyamic acid (PAA-Si) was prepared by condensation of PMDA and ODA as well as subsequent modification with KH-550 to improve the adhesion between the material and the substrate surface. Polyimide/graphene (0.3–2.0 wt%) nanocomposites were prepared by solution blending of PAA-Si with PheG followed by thermal imidization. The structures of PheG and PAA-Si were verified by infrared spectroscopy, Raman spectroscopy and XPS. The microstructure analysis was performed by SEM and TEM to investigate the morphology of graphene in the polyimide matrix. The thermal, thermomechanical, and tribological properties of polyimide/graphene nanocomposites were investigated by TGA, DMA, and friction and wear tests. Because of their ease of preparation and superior physical properties over neat polyimide, the prepared polyimide/graphene nanocomposites showed promising applications as wear-resistant and self-lubricating materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Sheng Xu,Lifen Liu,Yan Wang
Amine cross-linking is one of the popular modifications of polyimide membranes in order to improve their operation stability and separation performance. In this work, a novel kind of cross-linker tricarbohydrazide — 1,3,5-benzenetricarboxylic acid trihydrazide (BTCH), is synthesized and incorporated into polyimide membranes for isopropanol dehydration via pervaporation. The chemical structure of BTCH is examined by NMR and FTIR to confirm the successful synthesis. The effects of BTCH content and membrane-forming temperature on the membrane physicochemical properties and separation performance are studied and characterized by various techniques. And the possible reaction mechanism during the chemical cross-linking is proposed and analyzed. This work is believed to shed useful insights on the chemical modification of polyimide membranes for pervaporation and other membrane-based separation applications.
研究领域:
材料科学
·
分离技术
✓ 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）