ACS Nano
·
2019
·
IF 13.903
Xifan Chen,Yuanzhi Zhu,Miao Zhang,Jinyi Sui,Wenchao Peng,Yang Li,GuoLiang Zhang,Fengbao Zhang,Xiaobin Fan
MXenes, a family of two-dimensional (2D) transition-metal carbide and nitride materials, are supposed to be promising pseudocapacitive materials because of their high electronic conductivity and hydrophilic surfaces. MXenes, prepared by removing the “A” elements of their corresponding MAX phases by hydrofluoric acid (HF) or LiF–HCl etching, possess abundant terminal groups like −F, −OH, and −O groups. It has been proven that the MXenes with fewer −F terminal groups and more −O groups showed a higher pseudocapacitor performance. In organic reactions, −OH and −X (X = halogen) groups could turn to ether groups in strong nucleophilic reagent. Inspired by that, herein, we report an n-butyllithium-treated method to turn the −F and −OH terminal groups to −O groups on the Ti3C2Tx MXenes. Two types of Ti3C2Tx MXenes prepared by either HF or LiF–HCl etching were systematically investigated, and a comparison with the traditional KOH/NaOH/LiOH-treated method was also carried out. It is found that most of the −F terminal groups on the Ti3C2Tx MXenes can be successfully removed by n-butyllithium, and abundant −O terminal groups were formed. The n-butyllithium-treated Ti3C2Tx MXenes show promising applications in high-performance pseudocapacitors. A record high capacitance of 523 F g–1 at 2 mV s–1 was obtained for the n-butyllithium-treated Ti3C2Tx MXenes, and 96% capacity can remain even after 10 000 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Fuchong Li,Yang Gao,Chen Yu,Hailong Yang,Gai Guo Liu,Wei Cao,Jinshan Guo
The traditional batch synthesis of liquid rubber faces issues such as low monomer polymerization concentration, poor uniformity of the reaction system, and inadequate heat dissipation, resulting in an unsatisfactory synthesis efficiency. This study presents a method for the rapid and efficient synthesis of high vinyl 1,2-polybutadiene liquid rubber using butadiene as the monomer and n -butyllithium as the initiator. By applying continuous flow microchannel reactors, the limitation of traditional synthesis method can be overcome. The addition of a modifier in the raw material promotes the formation of high vinyl structure. The preparation of liquid rubber requires the addition of a large amount of metal lithium initiator. However, for aerospace sealants, there is a requirement for low metal ion content. To address this, we employed different methods to reduce the metal ion content in the liquid rubber and increase its purity. Ultimately, we achieved the synthesis of high-purity polybutadiene liquid rubber with 1,2-vinyl content exceeding 88%, narrow molecular weight distribution, and tunable molecular weights. This research will provide technical guidance for the industrial application of polybutadiene synthesis in continuous flow microchannel reactors.
研究领域:
化学工程
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高分子科学
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材料科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Hanlin Du,Yueting Deng,Xingyu Hu,Juan Peng,Huan Hu,Yun Tang,Xu Ye,Jajun Ma,Junxiao Yang
Low dielectric photoinduced patterned materials have attracted extensive attention owing to their potential applications in integrated circuits and semiconductor devices. In this work, we synthesized a low dielectric polymer that can be used for photolithography. The monomer, 1-(4-vinylphenyl)-2-(4-benzocyclobutenyl)ethene (DVB-S-BCB), was synthesized from divinylbenzene (DVB) and 4-bromobenzocyclobutene (4-BrBCB) using the Heck reaction. Subsequently, P-DVB based on DVB-S-BCB was prepared by anionic polymerization . As the structure comprised thermally curable benzocyclobutene (BCB) groups and photocurable vinyl groups (UV/Thermal dual curing structure), P-DVB has been used for high-performance negative photosensitive resin with 2,6-bis(4-azidobenzylidene) cyclohexanone (BAC) as a photoinitiator. Photolithography was carried out using a 365-nm UV light source to obtain various patterns, and the research results indicate that photosensitive resins exhibit stable patterning processes at different curing stages. Besides, the cured P-DVB exhibited high thermal stability (T 5% above 420 °C in N 2 ), low dielectric constant (2.55 at 10 MHz), low dielectric loss (1.56 × 10 −3 at 10 MHz), and excellent mechanical performance. These properties make P-DVB a potential photoresist that can be widely used as interconnected dielectrics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 6
·1-13
·
IF 2.6
Wang Wenheng,Liao Mingyi,Wang Lei
The binary segmented styrene-butadiene rubber (SSBR) have been synthesized using butadiene (Bd) and styrene (St) as monomers through living anionic polymerization. This study investigates the loss peak transition mechanism, phase transition mechanism, and the relationship among structure, phase state, and dynamic mechanical properties of segmented SSBR. The results indicate that the two-segment polymerization method allows for precise control of the sequence structure of binary segmented SSBR. The change in the loss peak of SSBR is continuously observed. The phase structure of SSBR can be altered by adjusting the length ratio of the soft and hard segments, which makes structure transition from phase separation to partial compatibility, and ultimately to full compatibility. Furthermore, the mass ratio of Bd/St within the soft and hard segments can be manipulated to influence the compatibility of the SSBR system. TEM images reveal that the transition from complete phase separation to partial compatibility, and ultimately full compatibility, can be represented by changes in the size and distribution of Bd aggregate particles, transitioning from large-sized, mixed-sized particles to uniformly small-sized particles.
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 APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 42
·e56118
·
IF 2.7
Wenheng Wang,Chunqing Zhang,Mingyi Liao
Through anionic two-stage polymerization, block-type styrene-butadiene rubber (SSBR) with systematically regulable low-temperature loss peaks is successfully prepared. The influence of 1,2-Bd unit in the soft segment of block-type SSBR on mechanical properties, dynamic mechanical properties, and microscopic morphology is studied, while pressure factors are introduced into dynamic mechanical studies. The block-type SSBR with a soft segment containing 21.9 wt% of 1,2-Bd exhibits the highest tensile strength, elongation at break, and tear strength. Under atmospheric pressure, the soft segment 1,2-Bd unit influences the dynamic mechanical properties by altering the chain segment's motion loss capability. As the mass fraction of 1,2-Bd increases from 21.9 to 58.6 wt%, tan δ max increases, the glass transition temperature of the soft segment increases from −59.0 to −18.9°C. Additionally, influenced by thermodynamic compatibility, the microscopic morphology transitions from strong separation to weak separation. Pressure affects dynamic mechanical properties by altering the free volume of the chain segments. Pressure reduces tan δ max , increases T g , and raises the average T g of the soft segment by 11°C. The K value of the linear equation representing the relationship between the soft segment T g and the mass fraction of 1,2-Bd is unaffected by pressure.
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
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Zhiyuan Zeng,Tianqun Zhao,Yi Gong,Zhiqiang Yu
A novel aromatic multifunctional epoxide tri (2, 3-epoxypropyl phenyl) methane (TEP) was synthesized by starting from p-dibromobenzene, and its chemical structure was confirmed by FT-IR and NMR. Non-isothermal DSC showed that the TEP-MTHPA system had autocatalytic characteristics during the curing process when methyltetrahydrophthalic anhydride (MTHPA) was used as the reagent, which was in line with the autocatalytic model. As comparison, a commercially available epoxy resin, the tris(4-hydroxyphenyl) methane triglycidyl ether (TMTE), cured with the same curing agents was also investigated. The experimental outcomes indicate that the cured TEP resin exhibits excellent thermal stability, boasting a glass transition temperature of 172.4 °C and a thermal decomposition temperature at 5 % weight loss standing at 370.5 °C. Furthermore, the cured TEP resin surpasses the cured TMTE resin in electrical properties, with a volume resistivity of 1.07 × 10 17 Ω·cm, representing a 650 % increase, and a breakdown voltage of 37.01 kV/mm, representing a 50 % augmentation. Nevertheless, owing to the existence of flexible ether bonds, the cured TEP resin lags behind the cured TMTE resin in terms of mechanical properties.
研究领域:
材料科学
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化学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2024
·
IF 3.3
Jianai Chen,Mingjiao Sun,Yujie Dong,Weijun Li,Fener Chen
Mechanical stimulus-responsive materials are generally considered to be closely related to molecular packing in the solid state, underscoring the significance of regulating molecular packing via precise molecular design. In this study, flexible alkyl substituents were employed to adjust the molecular packing. By modifying alkyl substituents, predictable changes in the molecular packing of their derivatives were observed, resulting in adjustable ML properties. The DPA-PYZ-TB with a tert-butyl-side chain exhibited strong ML and MC stimulus response signals. The enhanced ML and MC performance can be attributed to the effective suppression of non-radiation through the helical crystal arrangement and strong intermolecular interactions. The relationship between molecular arrangement and ML/MC properties was validated through analysis of the single crystal structure and corresponding experimental results. This study offers valuable insights into the enigmatic ML process and the development of efficient luminous materials that utilize both MC and ML.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen Yang,Chong Liu,Yongzhao Hou,Xiangjun Dai,Cheng Zhong,Yongqiang Ma,Meixian Jiang
In this work, a novel carbon-enriched SiC by the polymer derived ceramic (PDC-SiC) route was manufactured. By varying the branched chain of the preceramic polymer, the structure and electromagnetic properties of the obtained PDC-SiC ceramics can be effectively altered through carbon enrichment. Specially, PDC-SiC ceramics obtained from branched polysilylacetylene (PSA) constitute a composite material that contains nano-sized SiC grains, carbon nanotubes (CNTs), and silicon carbide nanowires (SiC nw ). Such PDC-SiC ceramics possess a complex three-dimensional network of CNT S /SiC nw , leading to remarkable microwave absorption properties. Notably, the PDC-SiC ceramics processed from dimethyl-polysilylacetylene (D-PSA) achieved a minimum reflection loss (RL min ) of −55.0 dB at 14.4 GHz, and an effective absorption bandwidth (EAB) extends across 5.5 GHz, with a thickness of 2 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 4
·e6357
·
IF 3.1
Wenhua Hou,Lishuai Zong,Linyan Zhu,Jiaming Wang,Yabin Zhang,Zhansheng Li,Jinyan Wang,Xigao Jian
A tetraphenylethylene-containing bisphenol monomer 5-[4-(triphenylvinyl)phenyl]benzene-1,3-diol (TPE-OH) was designed and synthesized by Suzuki coupling and nucleophilic substitution reaction. By adjusting the proportion of TPE-OH, a series of rigid polyaryl ether, namely PPTES, were facilely synthesized by homopolymerization or copolymerization with 4-(4-hydroxyphenyl)-2,3-diazepine-1-one (DHPZ) and 4,4′-difluorodiphenyl sulfone (DFS). The following characterization of their structures with nuclear magnetic resonance and infrared spectroscopy confirmed successful synthesis of both monomers and polymers. Large, volume-twisted and non-coplanar rigid tetraphenylethylene could effectively increase the molecular chain spacing and reduce the regularity of the molecular chain, as evidenced by molecular dynamics simulation with Materials Studio, in turn to form an amorphous nature of PPTES phase state. In addition, such PPTESs have excellent solubility, heat resistance, and other comprehensive properties. Their glass transition temperature ( T g ) is between 219 and 300°C, and the 5% thermogravimetric temperature of PPTESs locates at 490–539°C under N 2 atmosphere. At 1 GHz, the intrinsic dielectric permittivity of polymer films is between 2.32 and 2.61, gradually decreases with TPE-OH content. This work would provide new idea and choice for the selection of polyaryl ether resin bisphenol monomer, and promote the development and application of low-dielectric polyarylether 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
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
The high flammability of ethylene vinyl acetate copolymers (EVA) limits its important applications in fire safety, and the addition of highly effective flame retardants can improve this deficiency. Melamine cyanurate (MCA) has limited carbon-forming ability and therefore is often combined with other flame retardants to achieve synergistic flame retardant effects and thus improve the flame retardancy of EVA. Therefore, in this study, MoS 2 @Fe 3 O 4 hybrid materials were synthesized by in-situ growth of molybdenum disulfide (MoS 2 ) and ferric oxide (Fe 3 O 4 ) and their structures were characterized using various techniques. The hybrids were blended with melamine cyanurate (MCA) into ethylene vinyl acetate copolymer (EVA) by melt blending method to reduce the fire hazard. The EVA composites with 1.0 wt% MoS 2 @Fe 3 O 4 blends significantly improved the coke residue and limiting oxygen index values to 22.5 % and 23.2 %, while their peak heat release rate, total heat release, and total smoke release were reduced by 62.5 %, 11.7 %, and 35.3 %, respectively, as compared to pure EVA. The results suggest that the use of MoS 2 @Fe 3 O 4 hybrids in combination with MCA is a promising strategy for the development of advanced flame-retardant materials.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Dongsheng Ma,Xu Liao,Xiaofeng Li,Yang Liu,Xiumei Zhang
The development of degradable food packaging materials with hydrophobic and oleophobic properties is a key to focus in reducing plastic waste. Chitosan is gaining interest for its versatility and easy modification, but its application is limited by the poor hydrophobicity and oleophobicity. Using polymers to modify chitosan films has been shown as a promising approach to solve this issue. In this study, the modified films (CS/xmono-PDMS-E, where x = 0.25, 0.5, 1, 2, and 3 %) were prepared by utilizing mono-terminal epoxy-terminated polysiloxane (mono-PDMS) and chitosan (CS) through chemical grafting. The qualities of these films were characterized. CS/xmono-PDMS-E films were demonstrated to have enhanced hydrophobicity, oleophobicity, moisture resistance, and thermal stability in comparison to CS films. Furthermore, because Si O Si has a greater bonding energy in the PDMS chain segment, the CS/xmono-PDMS-E films showed superior UV shielding. The resistance to weathering of CS/xmono-PDMS-E films was also greatly enhanced by the low surface energy of PDMS, which moved to the surface during drying. By combining experimental design with result characterization, this work provides a new strategy for bio-based packaging materials featuring with green double sparse coatings, showing great potential for low-carbon recycling applications.
研究领域:
材料科学
·
食品科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 36
·365201
·
IF 2.9
Xiaojing Lv,Chunyan Liu,Mingfa Shao,Jin Li,Minao Xia,Jiankun Cui,Juncheng Dong,Mi Ouyang,Cheng Zhang
Electrochromic polymers (ECPs) have great application potential in flexible displays, and there is an increasing expectation of using green methods to form ECP films. Herein, we propose a modified microemulsion method to prepare cyan/magenta/yellow (C/M/Y) water-dispersed electrochromic polymer nanoparticles (WDEN) systems. Three polymer films (WDECP-C/M/Y) maintain similar electrochemical properties compared to their corresponding organic solvent-based polymer films. It is intriguing that WDECP-C/M/Y exhibit better electrochromic properties in terms of higher cycling stability (97.24%, 95.05%, and 52.84%, respectively) and faster switching time (0.94 s, 1.09 s, and 1.34 s for coloring time, respectively) due to the introduction of nanoparticles. In addition, it can achieve various desired colors by blending the C/M/Y WDEN systems in different ratios. The calculated chromaticity coordinates of the blending polymer films show close values to the experimental observation, and the calculated ΔE*ab values range from 2.6 to 10.3, which may provide theoretical guidance for precisely color control. Finally, large-scale and patterned devices were assembled, which can achieve colored-to-colorless reversible electrochromism at a low driving voltage of 0–1.5 V. This work puts forward a universal and environmentally sustainable strategy to prepare WDEN systems, demonstrating their wide range of applications in display devices and electronic tags.
研究领域:
材料科学
·
显示技术
·
绿色化学
✓ 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）