Advanced Materials Technologies
·
2022
·Vol. 8
·期 1
·2200679
·
IF 8.856
Tong Chen,Chunyun Wang,Guoshen Yang,Qiang Lou,Qingping Lin,Shengdong Zhang,Hang Zhou
Monolithic integration of perovskite materials and their optoelectronic devices with well-developed thin-film transistor (TFT) backplane is leading to new applications in displays and image sensors. Herein, a scalable polyimide assisted patterning approach for monolithic integration of perovskite based high-sensitive phototransistor array on indium gallium zinc oxide (IGZO) active matrix backplane is introduced. Polyimide vias are first formed by conventional photolithography process, through which uniform perovskite films of arbitrary patterns with feature size less than 20 µm are fabricated by spin-on-patterning method. Using this technique, patterns of quasi 2D perovskite photoabsorbing layer are precisely deposited onto the channel area of the photosensing IGZO TFT, forming high-performance phototransistors with responsivity and detectivity reaching 835.7 A W −1 and 5.4 × 10 12 Jones, respectively. An image sensor with 8 × 8 pixels array containing both photosensing perovskite/IGZO transistors and switching IGZO transistors is demonstrated, in which the switching IGZO transistor elements on the backplane are protected by the non-patterned region of the polyimide encapsulation layer. This whole fabrication process is compatible with TFT manufacturing process and will significantly reduce the cost needed for constructing next generation high-resolution image sensors.
研究领域:
材料科学
·
电子工程
·
光电子学
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 69
·期 5
·485-491
·
IF 2.574
Guorong Qiu,Wenshi Ma,Li Wu
Polyimide microspheres were prepared via non-aqueous emulsion polymerization by using pyromellitic dianhydride (PMDA) as anhydride monomer and 2,2-bis(4-(4-aminophenoxy)phenyl)propane as amine monomer. The polyimide microspheres were well characterized by Fourier transform infrared spectroscopy, SEM and laser particle size analyzer. They were spherical in shape and monodisperse and their size was 31–33 μm. Polyimide mixtures formed by polyimide microspheres as fillers and polyimide composed of pyromellitic and dianhydride 4,4′-oxydianiline (ODA) as matrix were investigated with regard to thermal properties, dielectric properties and mechanical properties. With 10%–50% polyimide microspheres in the polyimide mixtures, the dielectric constants were 2.26–2.48 (1 MHz) and the loss tangents were 0.00663–0.00857 (1 MHz), which were both significantly lower than the values for ODA-PMDA polyimide. The decomposition temperature and glass transition temperature were above 440 and 290 °C. The polyimide mixtures possessed excellent thermal resistance. When the percentage of polyimide microsphere addition was 30%, the polyimide mixtures had the largest tensile strength (128.50 MPa) and elongation at break (9.01%). These results indicate that the polyimide microspheres were used as both low dielectric fillers and reinforcing fillers. © 2020 Society of Chemical Industry
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 1
·49640
·
IF 2.52
Chunyan Qu,Yao Tang,Dezhi Wang,XuPeng Fan,Hongfeng Li,Changwei Liu,Kai Su,Daoxiang Zhao,Jiaqi Jing,Xiao Zhang
Limitations in the properties of polyamide PA66, such as low glass transition temperature and high water absorptivity, limit its applications. Introduction of amorphous polyimide segments into the PA66 main chain lowers the glass transition temperature and melting temperature and also improves its processability. PA66-polyimide (PA-PI) copolymers with different weight ratios of PI are prepared by high temperature and high-pressure solution polymerization. The degree of crystallization of PA-PI copolymers decreases with increasing PI content. The melting point decreases from 261°C for PA66 to 223°C for PA-PI-4. Dynamic mechanical analysis shows that the T g increases from 70 to 90°C, and the storage modulus can be well maintained. Rheological studies show that the temperature for processing can reach 70°C. Copolymers with different PI contents show different processing viscosities. In addition, water absorptivity (about 1.8%) and dielectric constant values of PA-PI and PA6/6T are similar.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Hao Wang,Yunhua Lu,Pengwei Lv,Guoyong Xiao,Tonghua Wang,Lin Li
While conventional polymeric gas separation membranes are limited by the inherent permeability-selectivity trade-off, mixed matrix membranes (MMMs) often suffer from poor interfacial compatibility and non-selective void defects. Herein, rigid flaky polyimide (PI)-type covalent organic frameworks (COFs) were solvothermally synthesized using 2,4,6-triaminopyrimidine (TAP) and pyromellitic dianhydride (PMDA). The obtained COFs were adopted as functional fillers and blended into hydroxyl-containing polyimide (HPI) precursor derived from 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) to prepare thermally rearranged (TR) MMMs. The as-synthesized COFs possess excellent thermal stability, distinctive porous structure and moderate interfacial affinity with the polymer matrix, which effectively enhances the gas separation performance of the obtained membranes. At a PI-type COF loading of 2.0 wt%, the MMM treated at 450 °C for 1 h achieves superior separation performance. The permeabilities toward H 2 , CO 2 , O 2 and N 2 reach 2446, 2920, 495 and 131 Barrer, and the corresponding ideal selectivities of H 2 /N 2 , CO 2 /N 2 and O 2 /N 2 are 18.67, 22.29 and 3.77, respectively. Remarkably, the H 2 /N 2 separation behavior exceeds the 2008 Robeson upper bound, and CO 2 /N 2 as well as O 2 /N 2 separation performances are close to this limit. Elevated treatment temperature and extended heating time remarkably improve gas permeability but sacrifice membrane selectivity. Moreover, the fabricated MMMs display satisfactory anti-aging stability after 180-day ambient storage. This study develops a valid modification strategy via flaky PI-type COF incorporation to elevate the gas separation performance of TR polymers, providing a promising route for constructing high-efficiency gas separation membranes.
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2021
·
IF 2.161
Wei Deng,Guanguan Ren,Wenqi Wang,Weiwei Cui,Wenjun Luo
Polymer composites with high dielectric constant and thermal stability have shown great potential applications in the fields relating to the energy storage. Herein, core-shell structured polyimide@BaTiO3 (PI@BT) nanoparticles were fabricated via in-situ polymerization of poly(amic acid) (PAA) and the following thermal imidization, then utilized as fillers to prepare PI composites. Increased dielectric constant with suppressed dielectric loss, and enhanced energy density as well as heat resistance were simultaneously realized due to the presence of PI shell between BT nanoparticles and PI matrix. The dielectric constant of PI@BT/PI composites with 55 wt% fillers increased to 15.0 at 100 Hz, while the dielectric loss kept at low value of 0.0034, companied by a high energy density of 1.32 J·cm−3, which was 2.09 times higher than the pristine PI. Moreover, the temperature at 10 wt% weight loss reached 619°C, demonstrating the excellent thermostability of PI@BT/PI composites. In addition, PI@BT/PI composites exhibited improved breakdown strength and toughness as compared with the BT/PI composites due to the well dispersion of PI@BT nanofillers and the improved interfacial interactions between nanofillers and polymer matrix. These results provide useful information for the structural design of high-temperature dielectric materials.
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
POLYMER COMPOSITES
·
2024
·
IF 4.8
Yiting Long,Can Qu,Yuting Kang,Xu Huang,Pengfei Zan,Junshu Chen,Xiaoyan Sun,Qinlin Yu,Yatang Dai,Wei Wang,Linyu Pu,Huan Zhang
In order to prepare polymer dielectric materials with high energy storage density, a series of polyimide (PI) based Janus composite films were prepared by metal–organic frameworks (MOFs) material (UiO-66) with high dielectric constant ( ɛ r ) and boron nitride nanosheets (BNNSs) with high breakdown strength ( E b ). As reported, the UiO-66 can significantly improve the ɛ r of the composites. The ɛ r of 20 wt% UiO-66/PI film is 10.51 at 10 3 Hz, which is 3.1 times that of pure PI film (3.39 at 10 3 Hz). However, the E b of 20 wt% UiO-66/PI is only 58 MV m −1 , which is only 16.51% of pure PI (352 MV m −1 ). The sharp decline in E b reduces the energy storage capacity of the composites. To solve this problem, first, BNNSs with an average diameter of 2 μm and a thickness of 1.36 nm (about 4–5 layer) were obtained by hydrothermal reflux stripping. BNNSs/PI//UiO-66/PI Janus composite films with double-layer structure were prepared by directly casting BNNSs/PI on the surface of UiO-66/PI. For 0.3 wt% BNNSs/PI//10 wt% UiO-66/PI, the calculated energy storage density ( U e ) is 5.75 J cm −3 at 140 MV m −1 , which is 3.57 times that of pure PI film (1.61 J cm −3 at 140 MV m −1 ). Meanwhile, the charge discharge efficiency is 82.55% (at 140 MV m −1 ). Highlights BNNSs prepared by hydrothermal reflux stripping have fewer layers. BNNSs/PI composites improve the E b of UiO-66/PI composites by Janus structure. The U e of BP-0.3//UP-10 composites with Janus structure was 5.75 J cm −3 .
研究领域:
材料科学
·
高分子化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Hongyan Yao,Na Zhang,Kunzhi Shen,Ningning Song,Kaixiang Shi,Shiyang Zhu,Yunhe Zhang,Shaowei Guan
A dianhydride monomer 2, 5-bis(3, 4-dicarboxyphenoxy)-4′-phenylethynyl biphenyl (PEPHQDA) containing a chain extendable phenylethynyl pendant group has been successfully synthesized via successive nucleophilic substitution , Sonogashira cross-coupling, hydrolysis and dehydration reactions. A flexible microporous polyimide network has been prepared based on the use of triamine (TAPOB), affording hyperbranched polyimide, followed by the curing of phenylethynyl groups to give network structure. Specifically microporous features such as a well-defined surface morphology , microporous structure and nanometer-sized pore channels have been introduced to the flexible polyimide networks through this two-step pathway. This network exhibit a BET surface area (322 m 2 g −1 ) as well as a comparable CO 2 uptake (1.25 mmol g −1 at 273 K and 1 bar) and enthalpy of adsorption (30.3 kJ mol −1 ) to that of other microporous polyimides derived from rigid tridimensional monomers.
研究领域:
高分子科学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wei Xie,Yang Jiao,Zhili Cai,Hongyan Liu,Lili Gong,Wei Lai,Linglong Shan,Shuangjiang Luo
This paper reports two new series of benzimidazole functionalized polyimides and ionic polyimides for highly selective membranes with great potential for natural gas sweetening. It has been demonstrated that both the –NH groups in the benzimidazole moieties and the corresponding ionic groups after N -quaternization tighten the microporous structure and restrict polymer chain mobility through hydrogen bonding and electrostatic interaction. The BET surface areas and d -spacing values decrease with benzimidazole molar content or the degree of ionization. Consequently, a linear correlation between CO 2 permeability coefficients with benzimidazole molar content or degree of ionization was observed due to the decrease of CO 2 diffusivity, and the monotonic increase of CO 2 /CH 4 selectivities is ascribed to the increase of both diffusivity selectivity and solubility selectivity. The benzimidazole-based copolyimide and the ionic copolyimide membranes exhibited high CO 2 /CH 4 selectivity under high-pressure mixed-gas conditions. In particular, the copolyimide PI-0.75 membrane displayed a mixed-gas CO 2 permeability of 27 Barrer and CO 2 /CH 4 selectivity of 47 at 20 bar total pressure. The performance was much higher than those of the state-of-the-art commercial cellulose triacetate membranes for natural gas upgrading. The facile polymer synthesis and microporosity tunability, as well as the excellent mixed-gas separation performance, render the copolyimide membranes in this study promising towards economic membrane-mediated natural gas upgrading.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 20
·25137-25148
·
IF 2.478
Gong Jun-Shuai,Wang Zhi-Liang,Qu Hui-Wen,Cang Ding-Yong
A polyimide (PI)-based flexible bandpass filter is fabricated by self-metallization technology, which covers Wireless Local Area Network (WLAN) of 5.15—5.875 GHz. The measured characteristics indicate the flexible filter under flat state has the return loss of better than 20 dB, the minimum insertion loss of 0.83 dB, a 3 dB bandwidth of 0.725 GHz, and the central frequency of 5.5 GHz. At the same time, the designed filter is measured in different bending and folding conditions. Simulated and measured results are similar whether the filter is under flatting, bending, or folding conditions. Fatigue test and timeliness test are studied to confirm that the filter has stable chemical and mechanical properties. The formed silver layers fabricated by self-metallization technology have good mechanical and electrical flexibility. The designed flexible filter is promised for integration within future flexible electronics.
研究领域:
电子工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2022
·
IF 1.841
Shidong Zhou,Xiaoxing Niu,Xiuli Zhang,Yuanliang Zhao
The synergistic effect of silica (SiO2) and copper (Cu) nanoparticles in polyimide (PI) on the friction interfacial deformation of polyethersulfone/polyimide (PES/PI) blends was studied. Results indicate that the effect of SiO2 and Cu nanoparticles on the tribological performance of PES/PI nanocomposites is quite different from each other. The addition of SiO2 nanoparticles into PI improves the antifriction of PES/PI nanocomposites by 24.4%, but has little effect on the wear resistance. The incorporation of Cu nanoparticles into PI enhances the wear resistance of PES/PI nanocomposites by 55.5%, but has little effect on the antifriction. PES/PI nanocomposites achieve the better comprehensive tribological performance when the content of SiO2 and Cu is 0.8 wt and 0.2 wt%, respectively. The friction interfacial deformation analysis reveals that SiO2 in PI improve the continuity and uniformity of deformation in friction interface and reduce the severe wear of transfer film. Cu nanoparticles in PI improves the continuity but not the ununiformity of deformation. Thus, the abrasive wear of counterpart ball is severe. The synergistic effect of SiO2 and Cu nanoparticles in PI improves the continuity and uniformity of friction interfacial deformation, which contributes to the improvement of friction and wear of PES/PI nanocomposites.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2019
·Vol. 40
·期 9
·3438-3452
·
IF 2.268
Yuanliang Zhao,Xiaowen Qi,Jian Ma,Yu Dong,Yulin Yang
The effects of polyimide with silica (SiO 2 -PI) and pores (porous PI) on the morphology, thermal, mechanical, and tribological properties of polytetrafluoroethylene (PTFE) composites were investigated. SiO 2 -PI and porous PI fillers decrease the compactness of PTFE matrices within PTFE/SiO 2 -PI composites and PTFE/porous-PI composites. In addition, SiO 2 -PI fillers improve the interfacial bonding between PI fillers and PTFE matrices, which is opposite to the detrimental effect of porous PI fillers. Thermal and mechanical properties of PTFE composites were deteriorated apparently. The friction coefficients of PTFE/SiO 2 -PI and PTFE/porous-PI composites are 9.5% and 8.5% lower than that of PTFE/PI, respectively. The wear resistance of PTFE/SiO 2 -PI and PTFE/porous-PI composites is enhanced by 77.8% and 70.1%, respectively. Scanning electron microscopy (SEM) of worn surface indicates that SiO 2 -PI and porous PI fillers protect PTFE matrices from counterpart ball, which inhibits the plastic flow of PTFE matrices effectively. In addition, the uneven worn surface decreases the contact area between PTFE composites and counterpart ball. Compared with SiO 2 -PI fillers, the extension of porous PI fillers in friction process increases the contact area between PTFE composites and counterpart, which induces the relatively poor tribological performance of PTFE/porous-PI. Furthermore, SiO 2 -PI and porous PI fillers contribute to the formation of smooth and uniform transfer films, which improve the tribological performance of PTFE composites effectively. In addition, compared with adding SiO 2 -PI into PTFE, the addition of SiO 2 nanoparticles into PTFE/PI induces the rough and uniform transfer films, which is bad for tribological performance of PTFE/PI/SiO 2 composites. POLYM. COMPOS., 40:3438–3452, 2019. © 2019 Society of Plastics Engineers
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Jianghuai Hu,Zhiping Wang,Zheng Lu,Chang Chen,Meng Shi,Jianbo Wang,Erjin Zhao,Ke Zeng,Gang Yang
Because of the unique conjugated heterocyclic structure and the presence of reactive groups, adenine which can be obtained from biomass may be an ideal bio-based alternative structure of petroleum-based aromatic/heterocyclic structures. In this paper, the adenine was introduced into mainchain of polyimide (API) for the first time to evaluate the feasibility of replacing petroleum-based aromatic/heterocyclic structures by adenine. Systematic studies showed that the API possesses outstanding solubility, thermal and mechanical properties (glass transition temperature ( T g ): 363 °C, weight residual of 95%: 513 °C (N 2 ); 506 °C (Air), tensile strength : 144 MPa). Systematic studies indicated that hydrogen-bonding interaction could be a significant cause of these unique thermal and mechanical properties.
研究领域:
材料科学
·
生物学
✓ 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）