RSC Advances
·
2017
·Vol. 7
·期 4
·2211-2217
·
IF 3.108
Bo Feng,Kai Xu,Aisheng Huang
Nanohybrid graphene oxide (GO)/polyimide (PI) mixed matrix membranes (MMMs) were prepared by dispersing GO into PI through wet phase inversion method. The structure of GO/PI MMMs was characterized by using XRD, FT-IR and XPS. FESEM was used to analyze the morphology of the GO/PI MMMs. The hydrophilicity of the GO/PI MMMs was determined by static water contact angles. The performances of the GO/PI MMMs were evaluated for desalination of seawater through pervaporation. The GO/PI MMMs display excellent water permeability and salt rejection for desalination of different concentrations of seawater. At 90 °C, the GO/PI MMMs exhibit a high water flux (36.1 kg m−2 h−1) and a high salt rejection (99.9%). Further, the GO/PI MMM displays a high stability for seawater desalination. This high separation performance combined with high stability and facile fabrication route recommend the developed GO/PI MMMs as a promising candidate for desalination of seawater.
研究领域:
材料科学
·
环境工程
·
化学工程
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 18
·10827-10835
·
IF 3.361
Zhongxin Zhang,Yuelei Pan,Lunlun Gong,Xiandong Yao,Xudong Cheng,Yurui Deng
Polyimide aerogels were prepared using low-cost polymers with different structure capped polyamide oligomers serving as cross-linking agents. To investigate the effects of the anhydride density on cross-linker chain units and side groups of cross-linkers on their properties and microstructures, two kinds of polymers from maleic anhydride, endic anhydride, and styrene were prepared by simple radical polymerization. The polyimide aerogels exhibit densities as low as 0.087 g cm−3 and specific surface areas as high as 456 m2 g−1. And the maximum modulus of the aerogel is up to 21.3 MPa. These cross-linkers are alternatives to expensive small molecule cross-linkers, therefore reducing the cost of PI aerogels.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2012
·
IF 0.884
Yang Song,Yinhua Jin,Tianfu Yang,Jinhui Pang,Daming Zhang,Zhenhua Jiang,Baijun Liu
Aimed at clarifying the structure–property relationships of fluorinated high-performance polymers, two series of polyimides were synthesized via a two-step thermal imidization derived from isomeric diamine monomers. Furthermore, comparative studies on their properties including solubility, thermal properties, contact angles, refractive indices, dielectric constants and gas permeability were thoroughly performed. Some property differences of the isomers caused by the sequence changes were found.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-13
·
IF 16.419
Guo Yongqiang,Qiu Hua,Ruan Kunpeng,Zhang Yali,Gu Junwei
The development of lightweight and integration for electronics requires flexible films with high thermal conductivity and electromagnetic interference (EMI) shielding to overcome heat accumulation and electromagnetic radiation pollution. Herein, the hierarchical design and assembly strategy was adopted to fabricate hierarchically multifunctional polyimide composite films, with graphene oxide/expanded graphite (GO/EG) as the top thermally conductive and EMI shielding layer, Fe 3 O 4 /polyimide (Fe 3 O 4 /PI) as the middle EMI shielding enhancement layer and electrospun PI fibers as the substrate layer for mechanical improvement. PI composite films with 61.0 wt% of GO/EG and 23.8 wt% of Fe 3 O 4 /PI exhibits high in-plane thermal conductivity coefficient (95.40 W (m K) −1 ), excellent EMI shielding effectiveness (34.0 dB), good tensile strength (93.6 MPa) and fast electric-heating response (5 s). The test in the central processing unit verifies PI composite films present broad application prospects in electronics fields.
研究领域:
材料科学
·
电子工程
·
复合材料
·
热管理
·
电磁兼容性
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DOI
高影响因子
Advanced Materials Technologies
·
2019
·Vol. 4
·期 10
·1900426
·
IF 5.395
Peng Bi,Xiaowei Liu,Yang Yang,Ziyu Wang,Jing Shi,Gaomin Liu,Fangfang Kong,Benpeng Zhu,Rui Xiong
Wearable devices have become very important for collecting health information and monitoring the condition of seriously ill patients. However, most recently developed wearable devices can only monitor limited signals within a very small range of values. A novel sensor is fabricated by modifying the surface of polyimide nanowires with silver nanoparticles. These nanowire sensors can sense both pressure and temperature changes and have antimicrobial properties. The fabricated sensor can detect a wide range of pressure variation from 5 KPa to 100 KPa. A theoretical model is developed to explain the sensing mechanism of the silver-nanoparticle-modified polyimide nanowires. The experimental and theoretical results for the nanowires are in good agreement. By attaching these sensors to human joints and fingers, real-time information can be detected for human motion, such as walking or holding a hot cup of water. The excellent performance of this device shows that it has great potential for use in artificial skins for detecting temperature and human motion.
研究领域:
生物医学工程
·
纳米医学
·
柔性电子
·
智能材料
·
转化医学
·
可穿戴传感器
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2015
·Vol. 119
·期 3
·2039-2051
·
IF 2.042
Zhuo Longhai,Kou Kaichang,Yao Pan,Wu Guanglei,Wang Yiqun
The synthesis and thermal research of a pyridine-containing polyimide were reported in this work. The corresponding diamine monomer, 2,6-bis(4-(4-aminophenoxy)phenyl)-4-phenyl pyridine (BApPP), was synthesized through combining the nucleophilic aromatic substitution with modified Chichibabin reaction and hydrazine monohydrate reduction. Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance spectroscopy ( 1 H-NMR), and elemental analysis were used for chemical structural characterization, the results identified the chemical structures of the monomer and polymer. The melting behavior of the diamine monomer was studied by differential scanning calorimetry (DSC). The thermal properties of the resulting polyimide were investigated from DSC and thermo gravimetric analysis together. The results indicated the resulting polyimide exhibited excellent thermal stability, with the glass transition temperature around 275.0 °C and the initial mass loss of sample beyond 487.5 °C. The thermal decomposition process was analysed by combining the Avrami–Erofeev dynamic model and Ozawa–Flynn–Wall method. The coefficients of the thermal decomposition kinetics equation were calculated, and the final equation was obtained by polynomial fitting method.
研究领域:
高分子化学
·
材料科学
·
热分析
·
动力学
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DOI
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 25
·期 1
·181-191
·
IF 2.5
Liu Liling,Jiang Guojian,Wu Dandan,Ma Weidan,Zhang Huiru,Liang Shuang,Huang Chugeng
Polyimide (PI) fiber, as a high-performance fiber, possesses advantageous properties, such as outstanding thermal stability, fire resistance, and chemical resistance. It has great potential for use in warm clothing in extremely cold environments and fire-protective textiles, but has poor dyeability. In the present work, PI fiber was pretreated by ammonia and then dyed. The result shows PI fiber could be dyed with basic dyes after the assistance of ammonia. The X-ray diffraction analysis displayed an apparent change in the crystallinity of polyimide fibers. The thermogravimetry analysis illustrated that ammonia penetrated into polyimide fibers, but ammonia pretreatment had an insignificant effect on thermal stability. These changes in polyimide fibers indicated that ammonia could combine with the fiber macromolecules, penetrate inside fibers, and swell the fibers, resulting in elongation of polyimide fiber and decrease in the breaking force. The treated sample had higher color strength than the untreated sample did. The study of dyeing mechanism of PI fibers demonstrates that the Nernst adsorption isotherm is a favorable model for polyimide fiber dyeing with basic dyes.
研究领域:
纺织科学
·
化学工程
·
材料科学
·
高分子科学
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2025
·
IF 2.7
Yuxuan Xu,Ruoqing Zhao,Weiwei Li,Wenjing Zhang,Yunqiang Cao,Huihui Ma,Lu Zheng,Xuewen Wang
Polyimide (PI) films have been extensively utilized as flexible substrates in various cutting-edge fields, including aerospace, microelectronics, and healthcare. However, existing techniques to prepare PI films typically exhibit a limited degree of thickness controllability, surface uniformity, and mechanical stability, which hardly meet the requirements in high-precision flexible devices and integrated systems. Here, a piezoelectric spray coating method is proposed for preparing high-quality PI films with controllable thickness. We have investigated the atomization effect and key parameters in the spraying process, such as viscosity, amplitude, liquid feed rate, speed, air pressure, and spraying cycles. We can precisely control the thickness of the resultant PI films by optimizing these parameters. The prepared PI films exhibit superior characteristics, such as high smoothness, bubble-free surfaces, uniform thickness, high thermal stability, and excellent optical properties. With these advantages, such an approach may contribute to developing high-performance flexible electronics.
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Haodong Lin,Xu Zhang,Bilin Zhang,Liangkang Huang,Jun Fang,Xinhai He,Jianwei Li
Flexible piezoelectric sensor demonstrates significant advancements in wearable electronics. However, the development of piezoelectric materials capable of operating under extreme conditions with exceptional thermal stability remains a critical challenge. Herein, FPI/PAN nanofibrous composite membrane was fabricated via a co-electrospinning technique, achieving a synergistic integration of piezoelectric and triboelectric effects. The synergistic interaction enhances mechanical-to-electrical conversion efficiency through charge superposition and interfacial polarization. The as-prepared sensor demonstrates favorable piezoelectric voltage output of 8 V and rapid response and recovery times (12 ms and 14 ms, respectively). The piezoelectric output remains stable after 10,000 cycles at 15 Hz/10 N, demonstrating excellent durability. In addition, the sensor has the ability to accurately detect diverse human motions, such as joint flexion, eye-blinking, and dynamic impacts. Notably, the FPI/PAN membrane maintains structural stability before 500 °C. Furthermore, it is found that the membrane exhibits a low dielectric constant (1.62-1.67) and smaller dielectric loss (0.0008-0.0024) within the range of 0-1 MHz. This study represents a new path for design and development of self-powered nanofibrous wearable sensors.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yehui Liang,Xiaoying Li,Guanxiang Zhong,Ruoyu Chen,Wenyang Kou,Kai Wang,Hetao Chu
Polyimide films have been widely used in the fields of microelectronics and aerospace due to their exceptional overall performance. However, achieving simultaneous improvements in the dielectric, toughness, and mechanical properties of PI films has been a critical and challenging problem. Herein, pyromellitic dianhydride and 4,4′-oxydianiline were used as reactive monomers to prepare polyamic acid porous microspheres (PM) (PAA–PM) and polyimide PM (PI–PM) using a multiple emulsion method. The results show that PAA–PM has high transverse relaxation times (T2) in the precursor solution, which enables high additive capacity, and its homogeneous dispersion in the precursor solution benefits from the hydrogen bond interactions between the carboxyl groups of PAA–PM and the molecular chains of the precursor. Due to the formation of a microcross-linking bridged structure between PAA–PM and the precursor after thermal imidization, the toughness of the final composite film was increased by 332.6% compared to pure PI film, while the tensile strength and elongation at break were improved by 24.5% and 71.1%, respectively. In addition, the dielectric constant decreased by 23.1% (from 3.63 to 2.79 at 1 MHz) and the incorporation of microspheres has almost no effect on thermal stability of the film (T5% of 559.46 °C). The PM effectively mitigated the deterioration of dielectric properties caused by the reduction of the free volume fraction during the thermal stretching of the films.
研究领域:
材料科学
·
微电子学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Peng Cui,Qianshan Xia,Zhao Han,Yan Wang,Tao Li,Bin Liu,Wei Song,Guangping Song,Xuan Wang
The development of portable communication devices has turned to high frequency, light weight, and miniaturization. The devices have provided convenience in daily life, and they have also caused serious electromagnetic radiation. The research on the composite with high electromagnetic interference (EMI) shielding effectiveness has become crucial. In this work, an efficient strategy was provided by electrospinning and vacuum-assisted filtration methods for fabricating carbon nanotube/polyimide (CNT/PI) composite film. The CNT/PI composite film exhibited good mechanical performance, whose Young's modulus and the tensile strength were 446.1 MPa and 36.85 MPa, respectively. In addition, the total shielding effectiveness of CNT/PI composite films in the X-band (8.2–12.4 GHz) reached 78.6 dB. This work also provides a potential method for preparing high-performance composite materials.
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yanling Liu,Xinghai Pan,Zisong Zhou,Yuhang Xiao,Hao Mei,Sen Lin,Junhong Pu,Haolun Wang,Hui Wu
Flexible thermal protection is of great significance in fields facing various environments such as aerospace and electric vehicles. Elastic aerogels with micro-nanofibers as the base unit effectively solve the force-thermal compatibility, optimized the contradiction between mechanical strength and thermal insulation performance, and solves the risk of fragile aerogel. In order to develop elastic aerogels with lower density and better thermal insulation properties. Here, the first one-step preparation of ultralight polyimide microtube aerogel sponges (PMAS) using airflow-induced spinning is reported. PMAS consists of a large number of structurally controllable microtube, resulting in ultralight density (≈50 mg cm −3 ), ultralow thermal conductivity (37 mW m −1 ·K at 25 °C), and excellent elasticity and fatigue resistance, with no significant attenuation of the maximum stress after 1000 cycles of compression at 80% strain. In addition, PMAS has temperature-invariant dynamic mechanical stability and an operating temperature range from 77 to 573 K. These superior properties enable PMAS to be ideal choice for thermal insulation in extreme environments, thermal runaway in batteries, adsorption and gas filling. Airflow-induced spinning fills the gap in the industrial-scale preparation and material compatibility of microtube, while also providing a promising solution for the universal preparation of microtube structures.
研究领域:
材料科学
·
航空航天工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）