MICROELECTRONICS RELIABILITY
·
2022
·
IF 1.418
Zhongwei Wang,Zeming Fang,Hailong Wu,Qianfa Liu,Yuan Li,Li Luo,Ke Wang
The formation of conductive anodic filament (CAF) inside printed circuit boards (PCBs) is one of the major failure modes related to the long-term reliability of electronic devices. In this paper, the relationship between susceptibility to CAF formation and glass fiber/resin interfacial bonding strength of a thermosetting polyphenylene oxide (PPO)/glass fiber composite system was investigated. Laminates with different interfacial bonding strengths were prepared by coating glass fibers with different silane coupling agents. Interlaminar shear strength (ILSS) of the PPO composites with silane-treated glass fibers has been improved by around 30 %, compared to the PPO/glass fiber composite without silane treatment . An accelerated response to CAF susceptibility was realized by substantially reducing the hole wall to hole wall distance of PCB to 5mil and 7 mil. By correlating the test results of interlaminar shear strength , haloing effect and susceptibility to CAF formation, it is confirmed that the CAF resistance of PCBs is positively correlated with the glass fiber/resin interfacial bonding strength.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Huwei Wang,Jinkai Zhang,Haodong Zhang,Wei Li,Ming Chen,Qing Guo,Kah Chun Lau,Liang Zeng,Guang Feng,Dengyun Zhai,Feiyu Kang
Poor oxidation stability of ether solvents at the cathode restricts the use of dilute ether electrolytes with conventional concentrations around 1 M in high-voltage, lithium-metal batteries. Here, we report an anion-adsorption approach to altering the ether solvent environment within the electrical double layer (EDL) at the cathode by adding a small amount of nitrate so that the oxidation tolerance of nitrate-containing dilute ether electrolytes is enhanced up to 4.4 V (versus Li/Li + ), leading to complete compatibility with high-voltage cathodes and exhibiting superior cycling stability. Constant potential molecular dynamics simulations reveal that ether molecules are mostly excluded from the cathode because of nitrate occupation in the inner layer of the EDL, thus suppressing ether oxidative decomposition. This work highlights that regulating the interfacial structure by adding surface adsorbates, rather than passivating the cathode-electrolyte interphase or changing ion solvation, can help to enhance the oxidation stability of ether solvents.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Yangyang Chen,Jiangjiang Zhang,Yanmin Gao,Jaebeom Lee,Hongxia Chen,Yongmei Yin
Since amine compounds have been widespread pollutants in nature and they are extensively used in pharmaceutical industeries and dye manufacturing, it is highly desirable to develop simple, effective and naked-eye available analytical methods for such aliphatic diamines determination. Calixarenes as macrocycles have drawn intensive interests for fields such as biomedicine , supramolecular chemistry and smart materials. Here, instead of the normal complicated modification strategy, a facile and efficient method for one-pot synthesis of calix[4]arene crown ether (CCE4) capped gold nanoparticles (AuNPs) is proposed. The as-prepared CCE4–AuNPs are not only high water dispersity and stability even after storage for 3 months, but also capable of host–guest recognition of diamines in aqueous systems. Size-selective encapsulation of amine group between CCE4 and diamines carry out the aggregation of CCE4–AuNPs. The determination of diamines such as hexamethylenediamine or spermine can be realized by the UV–vis absorbance change and visual color difference.
研究领域:
分析化学
·
超分子化学
·
纳米材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Jianhua Zhu,Jifu Zheng,Chunli Liu,Suobo Zhang
Ionic complexing induced phase inversion in an aqueous polyacrylic acid (PAA) coagulation bath was studied for fabricating highly permeable and selective nanofiltration (NF) membranes. To obtain membranes using classical liquid-liquid phase inversion, poly (arylene ether sulfone) with tertiary amine groups (PES-TA)/N, N-dimethylformamide/tetrahydrofuran was used as the polymer dope solution. The polycationic character of PES-TA allows ionic complexation with the carboxylic acid groups of PAA. The complexing reaction at the interface of the two liquids was shown to affect the rate of phase inversion, the morphology of membranes in the phase inversion process, and enhance membrane performance. At optimized conditions, the pure water flux of the PES-TA-PAA NF membrane was 26.1 L m −2 h −1 , 2.6 times greater than unmodified PES-TA membrane (10.7 L m –2 h –1 ). The rejection of salts and dyes of PES-TA-PAA membrane improved compared with PES-TA membrane and the rejection to MgCl 2 , MgSO 4 and Na 2 SO 4 were measured above 93%. The PES-TA-PAA NF membrane was shown to have stable performance in the pH range from 1 to 9 and maintain stable NF performance 100 h of filtration.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 3
·1-13
·
IF 2.6
Chi Yongbo,Li Mingzhuan,Chen Tongzhou,Liu Xingyao,Xie Ximing,Xu Jian
Epoxy resin is difficult to recycle and degrade due to its permanently crosslinked network structure after complete curing. Therefore, the traditional treatment of epoxy resin waste is landfill or incineration, which not only causes environmental pollution and the waste of resources but also limits its secondary applications. To solve this problem, a repairable and recyclable epoxy vitrimer, composed of bisphenol A glycidyl ether, glutaric anhydride, and carboxy-terminated polyether, was prepared in this work. The polyether-modified epoxy vitrimer showed good mechanical properties with a flexural strength of 69.2 MPa and a fracture toughness of 9.17 MJ/m 3 . Dynamic ester exchange reactions at elevated temperatures enable the epoxy vitrimer to achieve network rearrangement. As a result, the epoxy vitrimer exhibits excellent self-healing (complete healing of cracks within 5 min), shape memory, and recycling properties (75% retention of flexural strength). Furthermore, the prepared carbon fiber-reinforced vitrimer composites can be degraded by ethylene glycol for effective recycling of carbon fibers. Herein, the fracture toughness and reparability of the epoxy vitrimer were effectively improved by introducing the carboxy-terminated polyether into the crosslinked network, which has practical value for extending service life and reducing energy consumption in its engineering applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Chenglong Tong,Xingdi Zhang,Jiyong Zhao,Heran Nie,Zhichao Wang,Zhipeng Wang
Poly (aryl ether ketone) (PAEK) plays a critical role in the production and application of special engineering plastics. However, the traditional PAEK has some limitations in processing, such as high melt viscosity and high energy consumption. This study successfully synthesized a series of PAEK copolymers with bisphenol A and phenolphthalein side groups through nucleophilic polycondensation, aiming to reduce the high energy consumption associated with material processing. By adjusting the ratio of bisphenol A to phenolphthalein side groups, this research explores their influence on the properties of the copolymers. Comprehensive characterization using various testing methods revealed that increasing the bisphenol A content led to a decrease in heat deflection temperature and glass transition temperature. Although mechanical performance showed a slight decline, it remained comparable to other advanced engineering materials. Notably, tuning the ratio of bisphenol A to phenolphthalein significantly improved the melt rheological properties of the copolymers, reducing melt viscosity, enhancing polymer chain flexibility, decreasing crosslinking tendencies, broadening the processing window, and lowering energy consumption. This study provides a novel strategy for tailoring the performance of PAEK copolymers, offering substantial potential for further research and application. These copolymers are good candidates for next-generation high-performance engineering plastics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 34
·期 6
·2501-2509
·
IF 3.9
Lin Jing,Feng Mengna
Ceramic/polymer dielectrics with excellent thermal stability and high dielectric performance exhibit great potential in advanced capacitor applications. It is still a major challenge for ceramic/polymer dielectrics to obtain high dielectric constant at low content while maintaining excellent flexibility. To alleviate this issue, here, a flexible polymer dielectric composite consisting of poly(arylene ether nitrile) (PEN) matrix and barium titanate filler coated by Carbon and polypyrone (h-BT@C@PPy) was put forward in this work. The as-prepared composite films displayed high dielectric constant, comparable low loss and favorable interfacial binding due to the hydrogen-bonding interaction between –NH of h-BT@C@PPy and –CN of PEN, effectively promoting the interfacial polarization and remedying the internal interface defects between h-BT and PEN. Consequently, an addition of 8 wt% h-BT@C@PPy into PEN matrix raised the dielectric constant from 3.82 to 13.3 at 1 kHz, while maintaining relatively low dielectric loss (0.05@1 kHz). However, the breakdown strength showed a decreasing trend with the lowest value of 60.37 kV mm −1 . Meanwhile, the better flexibility, outstanding thermal stability (the 5% weight loss above 500 °C) as well as excellent permittivity-temperature stability was also delivered by the PEN-based composite films. This strategy furnishes a perspective to design ceramic/polymer dielectrics with high- k achieved at low filler content for the applications of organic film capacitors.
研究领域:
材料科学
·
聚合物复合材料
·
介电材料
·
纳米技术
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Xiao-Yong Zhai,Xiao-Qing Wang,Yi-Xuan Ding,Yong-Gui Zhou
Partially biobased polysilylethers (PSEs) are synthesized via dehydrocoupling polymerization catalyzed by an anionic iridium complex. Different types (AB type or AA and BB type) of monomers are suitable. Levulinic acid (LA) and succinic acid (SA) have been ranked within the top 10 chemicals derived from biomass. BB type monomers (diols) derived from LA and SA have been applied to the synthesis of PSEs. The polymerization reactions employ an air-stable anionic iridium complex bearing a functional bipyridonate ligand as catalyst. Moderate to high yields of polymers with number-average molecular weights ( M n ) up to 4.38 × 10 4 were obtained. A possible catalytic cycle via an Ir-H species is presented. Based on the results of kinetic experiments, apparent activation energy of polymerization in the temperature range of 0–10 °C is about 38.6 kJ/mol. The PSEs synthesized from AA and BB type monomers possess good thermal stability ( T 5 = 418 °C to 437 °C) and low glass-transition temperature ( T g = −49.6 °C).
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 52
·期 6
·780-788
·
IF 3.543
Weihai Zhang,Jiuduo Xu,Xuesong Li,Guanghe Song,Jianxin Mu
A series of copoly(aryl ether sulfone)s containing double-decker-shaped silsesquioxane (DDSQ) in the main chain was prepared. Toward this end, a novel diphenol polyhedral oligomeric silsesquioxane macromer was synthesized by hydrosilylation between 3,13-dihydro octaphenyl double-decker silsesquioxane (denoted dihydro DDSQ) and eugenol. The poly(aryl ether sulfone)s were synthesized from diphenol DDSQ, bisphenol A (BPA), and 4-fluorophenyl sulfone using a one-step high-temperature solution method. By adjusting the ratio of diphenol DDSQ to BPA, copolymers with variable DDSQ content in the main chains were obtained. With increased DDSQ content in the main chain, the glass transition temperature decreased based on differential scanning calorimetry, and anti-degradation was enhanced based on thermogravimetric analysis. Moreover, the dielectric constant κ of pure polymer (3.19 at 1 MHz) initially increased to 4.04 (DDSQ molar ratio = 10%), and then decreased to 2.68 at 1 MHz (DDSQ molar ratio = 100%). Crystallization behavior, solubility, and surface hydrophobicity were also investigated. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 780–788
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Lan Li,Mingna Feng,Mingxia Wang,Zhihao Jiao,Jixue Li,Linfang Dong,Feng Yan
Background In order to improve the selective separation performance of the membrane for Li + and enhance the separation efficiency, a crown ether functionalized polysulfone membrane was prepared in this paper, and the Li + was separated by electrodialysis process. Methods Chloromethylated polysulfone (CMPSf) was used as the base membrane, 4′-aminobenzo-12-crown-4-ether (AB12C4) was in-situ grafted onto the surface of CMPSf membrane to obtain the PSf-sg-AB12C4 membrane. The chemical structure of the membrane surface was characterized by ATR-FTIR and XPS. The surface and cross-sectional morphologies of the membrane were characterized by FESEM. The PSf-sg-AB12C4 membrane was used for selective separation of Li + by membrane coupling with electric field. Fingings The results show that the CMPSf membranes and the PSf-sg-AB12C4 porous membrane have almost no selective separation performance for Li + , while the PSf-sg-AB12C4 dense membrane can selectively separate Li + . After optimizing the conditions of voltage, ion concentration and solution pH, the separation factor of the PSf-sg-AB12C4 dense membrane for Mg 2+ to Li + is up to 32.6. In addition, the separation factors of coexisting ions such as Na + , K + , Ca 2+ to Li + are all higher than that of Mg 2+ to Li + , suggesting that the PSf-sg-AB12C4 dense membrane is a promising material for selective separation of Li + from brine.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 4
·1948-1960
·
IF 3.531
Wei Ma,Xiang Wang,Weiping Chen,Yao Chen
A heat-resistant soluble hyperbranched polyaryl ether ketone (HPAEK) is synthesized as the main resin of sizing agent and coated on the surface of carbon fiber (CF) with active group. As a result, the monofilament tensile strength of CF is increased by 12.00% and due to the improved fiber surface wettability and interface compatibility between CF and polyether ether ketone (PEEK), a 68.29% increase of interlaminar shear strength is achieved.
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shunqiang Chen,Weiduo Zhu,Lijiang Tan,Digen Ruan,JiaJia Fan,Yunhua Chen,Xianhui Meng,Qingshun Nian,Xin Zhao,Jinyu Jiang,Zihong Wang,Shuhong Jiao,Xiaojun Wu,Xiaodi Ren
Ethers are promising electrolytes for lithium (Li) metal batteries (LMBs) because of their unique stability with Li metal. Although intensive research on designing anion-enriched electrolyte solvation structures has greatly improved their electrochemical stabilities, ether electrolytes are approaching an anodic bottleneck. Herein, we reveal the strong correlation between electrolyte solvation structure and oxidation stability. In contrast to previous designs of weakly solvating solvents for enhanced anion reactivities, the triglyme (G3)-based electrolyte with the largest Li+ solvation energy among different linear ethers demonstrates greatly improved stability on Ni-rich cathodes under an ultrahigh voltage of 4.7 V (93% capacity retention after 100 cycles). Ether electrolytes with a stronger Li+ solvating ability could greatly suppress deleterious oxidation side reactions by decreasing the lifetime of free labile ether molecules. This study provides critical insights into the dynamics of the solvation structure and its significant influence on the interfacial stability for future development of high-efficiency electrolytes for high-energy-density LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）