Science Advances
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2025
·Vol. 11
·期 12
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IF 12.5
Zekai Wu,Chengzhen Chu,Yuhui Jin,Lei Yang,Bo Qian,Yuepeng Wang,Yihan Wang,Jiani Wu,Yujie Jia,Wenwen Zhang,Zhengwei You
There is usually a trade-off between high-tensile properties and processability in polymers because the mechanisms of these properties are mutually exclusive. Here, we design a chemically coupled four-arm dynamic polymer cross-link site to overcome this challenge. By concurrently increasing cross-link sites and dynamic bond contents, this approach fabricates polymer networks with high cross-link density yet low processing temperature, challenging the conventional structure-property relationship where cross-linking inherently limits plasticity. Notably, the material demonstrates remarkable processability, evidenced by the ratio of G′max to G′min with a temperature differential (ΔT) of 120°C (which signifies the soft-to-hard transition capability). This ratio reaches 153.3, higher than all reported cross-linked polyurethanes. This work represents a molecular strategy that combines electronic effect and topology network design to modulate materials’ properties, and it will be useful for developing next-generation materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Jie Wang,Ya-Nan Yu,Rou Huang,Ce Wang,Zheng Yin
Mix-ligands strategy is highly efficient for the rational construction of MOFs with particular structure motifs and high porosity, yet challenging and requiring matching in hierarchical coordination assembly and synergetic crystallization. The solvothermal reactions of 1,3,5-tris[4-carboxyphenyl]benzene (H 3 btb) and 1,4-benzenedicarboxylic acid (H 2 bdc) with different 3d metal ions , generated highly porous mixed-ligands MOFs of [(CH 3 ) 2 NH 2 ] 2 [Mn 3 (btb) 2 (bdc)]·12DMF·3MeOH ( Mn-btb-bdc ) having anionic 3D frameworks constructed from linear [Mn 3 (COO) 8 ] nodes, [Co 4 (btb) 2 (bdc)(H 2 O) 3 ]·15DMF·7H 2 O ( Co-btb-bdc ) processing neutral frameworks constituted by linear [Co 3 (COO) 6 (H 2 O) 4 ] and paddle-wheel [Co 2 (COO) 4 (H 2 O) 2 ] nodes, as well as one single-ligand MOFs of [(CH 3 ) 2 NH 2 ][Cd(btb)(H 2 O)]·8DMF ( Cd-btb-2fold ) exhibiting 2-fold interpenetrated ths net frameworks due to the unsuccessful introduce of the coexisted bdc ligand. Two new topology net of 2,3,8-connected net with point symbol of (4 2 ·6) 2 (4 4 ·6 6 ·8 12 ·10 5 ·12)(6) and 2,3,4,6-connected net with Point Symbol of (4·8 2 ) 4 (4 2 ·8 11 ·10 2 ) 2 (8 4 ·12 2 )(8 2 ) were found for Mn-btb-bdc and Co-btb-bdc . All these three MOFs are highly porous with void fractions of 60.9%, 52.2% and 61.4%, stemming from 3D-penetrated, 3D-penetrated and 1D channels, respectively. Such structural differentiations are attributed to the diversified electronic structure and coordination preference of different 3d metal ions, as well as the solvent template and temperature effects. Two-steps gate-opening behaviour in gas sorption isotherms was found in the flexible Mn-btb-bdc MOFs.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiawei Zhao,Haoyu Guo,Haiyang Liu,Tongqiang Fu,Wenzhe Zhou,Zicai Zhu,Qiao Hu
Flexible capacitive pressure sensors with high sensitivity over a wide pressure range are highly anticipated in the fields of tactile perception and physiological signal monitoring. However, despite the introduction of microstructures on the electrolyte layer, the deformability is still limited due to the size limitation of the microstructures, making it difficult to significantly improve the sensitivity of iontronic capacitive pressure sensors (ICPSs). Here, we propose an innovative strategy of combining carbon nanotubes (CNTs) topological networks and ionic hydrogel micropyramid array microstructures that can significantly enhance the sensitivity of flexible ICPSs for ultrasensitive pressure detection. Compared with other previously reported ICPSs, the sensor developed in this work exhibits an unprecedented sensitivity (Smin > 1050 kPa–1) and a high linear response (R2 > 0.99) in a wide pressure range (0.03–28 kPa) enabled by CNT percolation networks inside the microstructred electrolyte layer. This ultrasensitive and flexible ICPS also can effectively detect pressure from a variety of sources, including sound waves, lightweight objects, and tiny physiological signals, such as pulse rate and heartbeat. This work provides a general strategy to achieve an ICPS with both broader pressure-response range and higher sensitivity, which provides a stable and efficient way for a low-cost, scalable sensor for sensitive tactile sensing in human–computer interaction applications.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hong Pan,Guangzhong Xie,Wenqian Pang,Si Wang,Yang Wang,Zhi Jiang,Xiaosong Du,Huiling Tai
Polypyrrole (PPy) is a good candidate material for piezoresistive pressure sensors owing to its excellent electrical conductivity and good biocompatibility. However, it remains challenging to fabricate PPy-based flexible piezoresistive pressure sensors with high sensitivity because of the intrinsic rigidity and brittleness of the film composed of dense PPy particles. Here, a rational structure, that is, 3D-conductive and elastic topological film composed of coaxial nanofiber networks, is reported to dramatically improve the sensitivity of flexible PPy-based sensors. The film is prepared through surface modification of electrospun polyvinylidene fluoride (PVDF) nanofibers by polydopamine (PDA), in order to homogeneously deposit PPy particles on the nanofiber networks with strong interfacial adhesion (PVDF/PDA/PPy, PPP). This unique structure has a high surface area and abundant contact sites, leading to superb sensitivity against a subtle pressure. The as-developed piezoresistive pressure sensor delivers a low limit of detection (0.9 Pa), high sensitivity (139.9 kPa–1), fast response (22 ms), good cycling stability (over 10,000 cycles), and reliability, thereby showing a promising value for applications in the fields of health monitoring and artificial intelligence.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Hao Zhang,Ye Wang,Changle Tan,Jie Zhu,Xiang Sha,Dongqi Diao,Hongyan Liu,Ning Li,Fanglei Zeng
In this paper, polytetrahydrofuran (PTMEG) and isophorone diisocyanate (IPDI) were used as raw materials to synthesize prepolymers, and then castor oil (CO) was added to synthesize high-strength bio-based polyurethanes. The effect of castor oil content on the properties of COPU was investigated in this paper, and its heat resistance and mechanical properties firstly increased and then decreased with the increase of CO content.COPU3 showed the best comprehensive mechanical properties, with a tensile strength of 22.55 MPa and an elongation at break of 1008.57 %. The reason for its high strength is explored; it may be that hydrogen bonding and CO form a double cross-linking topological network, which enhances the mechanical strength of the polymer. These studies provide far-reaching value for the application of bio-based materials.
研究领域:
高分子材料
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生物材料
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材料科学
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聚合物化学
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功能材料
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Le Yao,Yi Huang,Guoqing Chen,Ziqian Zhou,He Zhu,Qi Zhang,Shiping Zhu
Adhesive tapes with high adhesion strength are critical in applications from structural bonding, biomedical devices, to flexible electronics. However, their performance is fundamentally limited by creep—time-dependent deformation under sustained stress—which leads to irreversible failure in long-term applications. While transient non-covalent interactions are widely engineered to enhance short-term energy dissipation, they inherently compromise creep resistance due to their dynamic reversibility. Herein, this persistent challenge is addressed by designing anti-creep adhesive tapes through precise topological regulation of polymer networks. By systematically comparing linear, covalent-crosslink, and trapped-entanglement-dominated architectures, the entanglement-stabilized networks are demonstrated to achieve a three-orders-of-magnitude reduction in creep rate while maintaining strong interfacial adhesion. The unique combination of long-chain entanglements and spare crosslinks enables efficient elastic energy storage without sacrificing tackiness, resolving the trade-off between dynamic dissipation and permanent mechanical integrity. This work provides both a mechanistic framework for understanding creep in adhesive materials and a scalable strategy for developing durable, high-performance polymer adhesives.
研究领域:
高分子材料科学
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生物医学工程
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柔性电子学
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粘附力学
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材料物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Cong Wu,Mengmeng Li,Dongshuai Hou,Bing Yin,Binmeng Chen,Zongjin Li
Cementitious materials in durability can be improved by membrane protection and osmotic hydrophobicity with Polystyrene acrylate (PSA) and polysiloxane (PSE), respectively. However, due to the significant differences in molecular structure, the fabrication of PSA- PSE composite coatings with multiple protective effects have been a thorny issue. In order to enhance the interfacial binding effect between PSA and PSE, and to solve the problem of poor stability caused by poor compatibility, this paper innovatively utilizes the topological network structure growth regulation mechanism of secondary surface functional nanoparticles to prepare PSA-PSE copolymer emulsions with highly crosslinked star and dendrimer structures, respectively, with branch grafting ratios of over 94% and semi-crystallinity of over 5.39%. As a consequence of surface treatment, numerous dense calcium-silicate crystals with low Ca/Si ratios are deposited inside the cementitious materials, decreasing the volume proportion of harmful micropores and connected capillary pores to below 10.4%. The modified copolymer coatings decrease the capillary water absorption and static permeability of concrete by over 55%, and lead to nearly 80% reduction in carbonation depth of cement hydrates, and have an adhesion strength of up to 3.3 MPa. Particularly, the proportion of ordered hydrogen bond within the composite coating reached 45.1%, demonstrating excellent reversible elastic deformation recovery performance.
研究领域:
材料科学
·
土木工程
·
高分子化学
✓ 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）