Materials Today Communications
·
2024
·
IF 3.7
Lechen Yang,Yong Li,Dajun Huan,Hewen Zhang,Chunling Zhu
Epoxy resin (EP) is usually brittle because of highly cross-linked chemical structure , so it is necessary to carry out research on toughening of epoxy resin. Here, a modified epoxy resin with enhanced mechanical toughness and strength was prepared using a novel modifier (PEA-BA), synthesized from polyetheramine D-400 (PEA) and benzoic acid (BA). Polyether chains that represent flexible structures, and aromatic rings representing rigid structures, were integrated together into the modifier to achieve simultaneous enhancement of the toughness and strength of the resulting epoxy resin. Moreover, the aromatic rings in PEA-BA formed π-π interactions with the aromatic rings in the EP network, further increasing the ductility of the modified epoxy resin. Research results demonstrated that the modified epoxy resin exhibited significantly improved elongation at break (increasing from 6.7 % to 39.2 %), as well as higher tensile strength (from 61.9 MPa to 69.3 MPa) and impact strength (from 25.3 kJ·m −2 to 62.9 kJ·m −2 ). Importantly, the glass transition temperature and thermal stability of the modified epoxy resin were not markedly reduced. The above properties indicated that PEA-BA achieved a favorable combination of high strength and ductility of epoxy resin, providing a new idea for toughening epoxy resin.
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
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Zhaoqi Zheng,Yan Hong,Peixu Zheng,Wei Luo,Jianhua Qiu,Liping Jiang
Graphical This study presents a strategy to synergistically enhance iodine capture by flexible cyclictriphosphonitrile-based covalent organic frameworks(COFs) (CTP-X-COF, X = PDA, ODA, BPY, DPT). The adsorption capacities of CTP-PDA-COF, CTP-ODA-COF, CTP-BPY-COF, and CTP-DPT-COF for iodine vapor are 4.65 g g −1 , 4.18 g g −1 , 2.38 g g −1 , and 3.57 g g −1 , respectively. The development of highly efficient materials for trapping radioactive iodine is essential for the safe use of nuclear energy. Herein, we present a strategy to synergistically enhance iodine capture by exploiting the flexible building blocks with the affinity properties of electrically rich heteroatoms by combining the cyclic triphosphonitrile derivative with amine linkers of different molecular lengths and constructing triangular pore-structured flexible cyclotriphosphonitrile-based covalent organic frameworks. A series of cyclotriphosphonitrile-based COFs (CTP-X-COF, X = PDA, ODA, BPY, DPT) with triangular pore topology were synthesized using CTP-6 as the node and connection point of p-phenylenediamine (PDA), 4,4-diaminodiphenyl ether (ODA), 5,5-diamino2,2-bipyridine (BPY), and 4,4-diaminotribiphenyl (DPT) with different molecular lengths. It was found that the adsorption capacities of CTP-PDA-COF, CTP-ODA-COF, CTP-BPY-COF, and CTP-DPT-COF for iodine vapor were 4.65 g g −1 , 4.18 g g −1 , 2.38 g g −1 , and 3.57 g g −1 , respectively. The results showed that the adsorption capacities of CTP-PDA-COF, CTP-ODA-COF, CTP-BPY-COF, and CTP-DPT-COF for iodine in cyclohexane were 281.50 mg g −1 , 221.67 mg g −1 , 161.14 mg g −1 , and 222.67 mg g −1 , respectively. It was found that the four COFs adsorbed iodine in cyclohexane solution was a mixed adsorption process with chemical adsorption playing a predominant role and physical adsorption as an auxiliary mechanism.
研究领域:
材料科学
·
核能安全
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Tiance An,Yuhang Wang,Jing Tang,Yang Wang,Lijuan Zhang,Gengfeng Zheng
A substantial challenge for direct utilization of metal–organic frameworks (MOFs) as lithium-ion battery anodes is to maintain the rigid MOF structure during lithiation/delithiation cycles. In this work, we developed a flexible, wavy layered nickel-based MOF (C 20 H 24 Cl 2 N 8 Ni, designated as Ni–Me 4 bpz) by a solvothermal approach of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (H 2 Me 4 bpz) with nickel(II) chloride hexahydrate. The obtained MOF materials (Ni–Me 4 bpz) with metal azolate coordination mode provide 2-dimensional layered structure for Li + intercalation/extraction, and the H 2 Me 4 bpz ligands allow for flexible rotation feature and structural stability. Lithium-ion battery anodes made of the Ni–Me 4 bpz material demonstrate excellent specific capacity and cycling performance, and the crystal structure is well preserved after the electrochemical tests, suggesting the potential of developing flexible layered MOFs for efficient and stable electrochemical storage .
研究领域:
材料科学
·
能源存储
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NPG Asia Materials
·
2018
·Vol. 10
·期 7
·618-629
·
IF 7.208
Fu Gengtao,Jiang Xian,Chen Yifan,Xu Lin,Sun Dongmei,Lee Jong-Min,Tang Yawen
The development of highly active air-cathodes with robust stability and a low price is of crucial significance for rechargeable Zn–air batteries and remains a great challenge. Herein, for the first time, we report a “rigid and flexible” material consisting of three-dimensional (3D) porous nickel-manganese oxide (Ni 6 MnO 8 ) coupled with 1D ultrathin Au nanowires (Au-NWs) as an efficient bifunctional oxygen electrocatalyst, adopting α-naphthol-Au(III) as a precursor of Au-NWs and pre-formed Ni 6 MnO 8 as a support. Ni 6 MnO 8 acts not only as a robust carbon-free support that is stable in alkaline electrochemical conditions, but also as a highly active component for the oxygen evolution reaction (OER), while flexible Au-NWs contribute to the excellent oxygen reduction reaction (ORR) activity and act as a flexible conductive electronic network. The coupling of Ni 6 MnO 8 and Au-NWs plays a complementary role in the two types of oxygen electrocatalytic reactions. Accordingly, their advantages have been optimally harnessed while overcoming their deficiencies. Moreover, a Zn–air battery assembled with such a rigid and flexible air-cathode has lower charge and discharge overpotentials and a higher cyclic stability than those with a mixed Pt/C+RuO 2 catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 5
·128
·
IF 3.6
Yingxiu Wu,Haiyan Guo,Bingyu Zhao,Yuxiu Yu,Yaodong Liu,Shouchun Zhang
Carbon molecular sieve (CMS) membranes demonstrate considerable advantages and significant potential in the separation of CO2and CH4. Nevertheless, current research predominantly emphasizes the enhancement of CMS membranes through the incorporation of rigid structures and chain spatial stacking. The role of flexible structures in this context remains inadequately understood. To address this gap, we introduced long-chain polydimethylsiloxane (PDMS) and copolymerized it to synthesize polyimide that combines rigid and flexible frameworks. This approach enabled us to investigate the impact of flexible structures on the structure and properties of carbon membranes by varying the PDMS content. The findings indicated that flexible PDMS significantly influenced the thermal decomposition behavior of polyimide and facilitated in situ silicon doping within the carbon membranes, thereby modifying the pore characteristics of the carbon film. Specifically, with a 10% addition of PDMS, the CO2permeability of the CMS membrane reached 9556 Barrer, representing an enhancement of 103.9% and surpassing the 2019 upper bound for CO2/CH4separation. Furthermore, the effect of pyrolysis temperature was also examined. Ultimately, this study offers a novel perspective on regulating the structural and performance characteristics of carbon membranes through the integration of long-chain flexible structures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xiaocun Tan,Qi Zou,Yizhou Huang,Mengyu Ouyang,Yazhou Tian,Jue Cheng,Junying Zhang
A series of regular rigid–flexible cross-linking epoxy networks were prepared from dithiol allyl glycidyl ethers (DTAGEs) and 4,4′-diaminodiphenylmethane (DDM). In these networks, the chemical structure of DTAGEs was tidily flexible and that of DDM was simply rigid, which ensured the flexible segments were more distinguishable from the rigid units. The effects of regularity and rigid–flexible character of the networks on shape memory properties, especially shape recovery speed, were investigated in detail. It was found that the shape recovery speed was reversely proportional to the flexibility of the regular cross-linking networks. Compared with flexibility, regularity had a greater impact on the recovery speed. In addition, regularity had a significant influence on the recovery speed of the rigid units while it had little influence on that of the flexible segments. The well-designed regular rigid–flexible cross-linking networks exhibited excellent shape memory performance with high shape memory fixity (≥98.4%) and shape memory recovery (≥99.4%).
研究领域:
高分子材料科学
·
功能材料
·
形状记忆聚合物
·
生物医用材料
·
智能响应材料
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2018
·Vol. 3
·期 11
·1800174
·
IF 4.622
Chonghui Li,Jing Yu,Shicai Xu,Shouzhen Jiang,Xianwu Xiu,Chuansong Chen,Aihua Liu,Tianfu Wu,Baoyuan Man,Chao Zhang
Substrate design has attracted much interest in development of an effective surface enhanced Raman scattering (SERS) sensor. A flexible SERS substrate with excellent performance needs to be sensitive to details of the preparation process; this sensitivity represents a significant challenge for practical applications as opposed to laboratory research applications. Here, a 3D flexible plasmonic structure, AgNPs@MoS 2 /pyramidal polymer (polymethyl methacrylate), is fabricated using a simple and low-cost method. Using experiments and theoretical simulations, the SERS performance of the proposed substrate is assessed in terms of its high enhancement factor, ultrasensitivity, quantifiability, reproducibility, stability, and reusability. Finally, the ultralow in situ detection limits of the standard melamine solution and melamine in milk are found to be 10 −10 and 10 −6 m , respectively, which meet the demand for real applications in the food security field.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Qingguang Bao,Jiangang Liu,Qingfeng Sun,Ning Wang,Shan Cheng,Jingyao Feng,Nan Li,Xigao Jian
Aiming at the problems of low bonding strength and large modulus difference at the interface between carbon fibers (CFs) and resin matrix, this research achieved in-situ growth of an adhesive "metal-phenolic" complex network (TA@Fe 3+ ) on CFs surfaces. Additionally, a modulus gradient transition layer featuring alternating "rigid-flexible" interlayer structures ((TA@Fe 3+ -GO) 2 ) was further constructed. The flexible TA@Fe 3+ complex network boosts chemical bonding at the fiber-resin interface, whereas the rigid GO enhances load transfer and dispersion. Through the synergistic effect of "interfacial adsorption-physical reinforcement", the interfacial strength is improved. The alternating “rigid-flexible” interfacial layer reduces the modulus mismatch between CFs and the resin by expanding the interfacial phase thickness and slowing the modulus decline rate, thereby minimizing interfacial stress concentration. Compared with UCF/PPESK composites, the modified composites exhibit a 40.4% increase in flexural strength and a 70% increase in interlaminar shear strength (ILSS). This study offers novel perspectives on the design of multi-level gradient modulus interlayer structures and the fabrication of strong-interfacial carbon fiber-reinforced polymer matrix composites (CFRPs).
研究领域:
材料科学
·
聚合物复合材料
·
表面工程
·
机械工程
·
纳米技术
✓ 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）