ChemPlusChem
·
2019
·Vol. 84
·期 4
·432-440
·
IF 3.441
Guangjie Gai,Libin Liu,Cheng-Hui Li,Ranjita K. Bose,Dong Li,Ning Guo,Biao Kong
Graphical Tough and stretchable : A metal-coordinated polyurethane complex was fabricated by complexing a simple pyridine-containing ligand with Fe 2+ ions The strong reversible coordination bond provides mechanical strength and the basis for self-healing. The complex possesses a very high tensile strength, and excellent self-healing efficiency of around 96 % of tensile strength at room temperature. The complex is notch-insensitive and possesses a very high fracture energy of 76186 J/m 2 . Self-healing materials can prolong device life, but their relatively weak mechanical strength limits their applications. Introducing tunable metal-ligand interactions into self-healing systems can improve their mechanical strength. However, applying this concept to solid elastomers is a challenge. To address this need, polyurethane-containing metal complexes were fabricated by introduction of a pyridine-containing ligand into polyurethane, and subsequent coordination with Fe 2+ . The strong reversible coordination bond provides mechanical strength and self-healing ability. By optimizing the monomer ratio and Fe 2+ content, the resulting complex possesses a very high tensile strength of 4.6 MPa at strain of around 498 % and a high Young's modulus (3.2 MPa). Importantly, the metal complex exhibits an extremely high self-healing efficiency of approximately 96 % of tensile strength at room temperature and around 30 % at 5 °C. The complex is notch-insensitive and the fracture energy is 76186 J/m 2 , which is among the highest reported values for self-healing systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2022
·
IF 11.958
Gaoyin Zhang,Dan Long,Weining Xu,Xiaowei Cheng,Sheng Huang,Chunmei Zhang,Ming Zhou,Kaiyuan Mei,Liwei Zhang
High-ferrite oil-cement (HFOC) has attracted extensive research interest owing to its excellent mechanical properties and corrosion resistance . However, it is difficult to distinguish ferrite and its hydration products in cement paste . Therefore, establishing the mechanism of improvement of the mechanical properties of Portland cement upon the addition of ferrite is challenging. In this study, spherical ferrite (SF) was prepared via jet granulation to explore the mechanism of hydration and improvement of mechanical properties of oil-well cement pastes upon the addition of ferrites. XRD results showed that the crystal structure of the SF is consistent with that of ferrite. Phase analysis of the hydration products revealed that the hydration products in the AFm phase gradually covered the SF particles entirely during the early hydration reaction and transformed into cubic crystals C 3 (A, F)H 6 during the subsequent hydration reaction. The assessment of mechanical properties demonstrated that the compressive and tensile strengths of the oil-well cement paste increased by 11.7 % and 17.5 %, respectively, upon the addition of 4 % SF. Moreover, the addition of SF reduced the elastic modulus of the cement paste. The mechanical properties enhancement mechanism of SF in oil well cement involves participating in the hydration process of oil-well cement and consuming fracture energy . This study provides theoretical support for the development mechanism of mechanical properties of oil-well cement.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
·
2023
·
IF 5.3
Xingjian Sun,Ping Rao,Xitao He,Canhui Yang,Wei Hong
Do materials prepared from identical compositions of constituting ingredients always exhibit similar mechanical properties? The answer is negative for most structural materials, as has been demonstrated by extensive studies on various factors such as the effects of processing and microstructures. However, the same question has seldom been addressed in the case of polymeric gels. In this work, by using a simple chemically crosslinked hydrogel as a model system, the mechanical properties, including elastic stiffness , fracture toughness , and fatigue threshold, of gels with identical chemical compositions are systematically investigated. The distinct material properties are then rationalized and quantitatively correlated to synthesis conditions and manufacture processes through scaling laws derived from basic physics. Different scaling laws are identified between samples prepared from swelling and deswelling. Extreme mechanical properties, such as the remarkable fracture energy of hydrogels prepared by deswelling from highly swollen samples, are observed and attributed to the structural characteristics of the polymer network , and further correlated to the synthesis processes. This study provides insights into the synthesis-property correlations of polymeric gels, which may have profound influences on the design of new polymeric materials and their applications in various fields.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
National Science Review
·
2023
·Vol. 10
·期 3
·
IF 20.6
Zhang Baoqiang,Zhang Xingyi,Zhou You-He
The inherent brittleness and low sustainability of YBa2Cu3O7–x (YBCO) bulk superconductor seriously impede its wide applications. It is a great challenge to achieve toughening of this material and maintain its invariable superconductivity at the same time. Here, we fabricate bulk YBCO composite superconductor with a density of 2.15 g cm−3, which consists of interlocking dual network construction and shows high toughness and durability. The results show that its unit normalized fracture energy at 77 K reaches 638.6 kN m−2, which is ∼14.8 times that of YBCO bulk prepared by the top-seeded melt textured growth (TSMTG) method. Its critical current shows no degradation during the toughening process. Moreover, after 10 000 cycles, the sample does not fracture with the decay of critical current at 4 K of 14.6% whereas the TSMTG sample fractures only after 25 cycles.
研究领域:
材料科学
·
超导技术
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Physics
·
2020
·
IF 10.443
S.Y. Zheng,H.C. Yu,C. Yang,W. Hong,F. Zhu,J. Qian,Z.L. Wu,Q. Zheng
The rapid developments of tough hydrogels have broadened the applications of gel materials in biomedicine and engineering fields, which recalls the fundamental understanding of the fracture behaviors of these tough, soft materials. Herein, we study the fracture behaviors of a Fe 3+ coordinated poly(acrylic acid- co -acrylamide) (P(AAc- co -AAm)) hydrogel through pure shear tests. We measure a material-specific length, called fractocohesive length L f , defined by the ratio of fracture energy to fracture work ( L f = Г / W f ). We show that L f scales several important lengths that characterize the fracture behaviors of the hydrogel, including the transition length of cut-sensitivity L c measured by stretching samples of various initial crack lengths to rupture, the increment of the crack length needed to attain the steady state L ss measured from the resistance curve, and the size of large deformation zone L i measured by the polarized microscopic image. We further show that the fracture of P(AAc- co -AAm) hydrogel is viscoelastic, as demonstrated by tensile and rheological tests at different deformation rates . This work gives an insight into the fracture behaviors of P(AAc- co -AAm) hydrogel and provides a methodology that should be applicable in characterizing the fracture behaviors of other tough materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Y. Jiang,J. Hou,P. Huang,J. Li,E.H. Wu,Z. Xu,Q.S. Liu,Zhuoming Xie,Qianfeng Fang
Hybrid tungsten composites reinforced with zirconium carbide (ZrC) nanoparticles and tungsten fibers were developed by the conventional powder metallurgy process (ball-mill mixing of powders and fibers followed by spark plasma sintering). The synergistic and mutual influences of the fibers and nanoparticles on tungsten were investigated in tensile behavior and fracture-energy tests. Aided by the ZrC nanoparticles, up to 30% of the fibers could be embedded in the tungsten matrix. The fracture energy was maximized by co-introducing 0.2 wt% ZrC particles with 20 wt% short tungsten fibers. The fracture-energy enhancement of the short fibers is contributed by pseudo-toughness from the fiber–matrix interface, inherent toughness from the fibers themselves, and grain refinement (by 50%) of the tungsten matrix. The fracture energy of the composite is very sensitive to the ZrC content, because the two-way action of ZrC weakens the pseudo-toughness of the interface energy.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
GIANT
·
2023
·
IF 7
Dongdong Zhou,Ruikun Sun,Andrew Wijesekera,Shalin Patil,Zhanhui Gan,Ting Ge,Xue-Hui Dong,Shiwang Cheng
Current polymer network design suffers from intrinsic trade-offs, where polymer networks with high modulus often turn out to be in short of stretchability or fracture toughness. Here, we show a novel polymer network design through polymer-nanoparticle alternating hybrids that enable integrating the non-polymeric colloid deformation into polymer network design. The new class of polymer network exhibits colloidal yielding at small deformation before conformational change at higher elongation ratios, enabling simultaneous achievement of high Young's modulus of E ≈ 10 − 50 M P a , high yield strength of σ Y ∼ 3 − 5 M P a , large stretchability of λ ∼ 7 − 10 , and high fracture energy density of Γ ∼ 30 M J / m 3 . These results demonstrate a successful strategy to decouple the molecular mechanics for yield from that for stretchability or toughness, leading to new polymer networks design.
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
Extreme Mechanics Letters
·
2025
·
IF 4.5
Wenjing Lu,Chong Wang,Zidi Zhou,Shuai Xu,Zishun Liu
The intrinsic fracture energy of polymer networks describes the minimum energy required for crack propagation, excluding any inelastic dissipation within the bulk. Recent studies have demonstrated that the intrinsic fracture energy arises from two distinct contributions. The first contribution Γ f is the energy dissipated by the rupture of polymer chains along the crack path, where these chains constitute the failure zone. The second contribution Γ e is the elastic energy released from the relaxation of polymer chains adjacent to the broken chains, where these chains constitute the elastic release zone. While existing models could predict the intrinsic fracture energy of polymer networks successfully, a quantification of the two intrinsic fracture energy contributions remains elusive. Here, utilizing polyacrylamide hydrogel, we conduct a series of pure shear tests to measure the fracture energy. The size of real elastic release zone is precisely controlled in this study by varying the heights of pure shear samples. Then, for the first time, Γ f and Γ e of the polyacrylamide hydrogel are quantitatively identified based on the relationship between the apparent fracture energy and the height of sample. Moreover, our development of a modified loop-opening model represents a significant advancement in the field. This model accounts for polymer network imperfections and incorporates parameters with clear physical meanings, aligning remarkably well with our experimental findings. Based on our model, we propose a novel method for determining the size of failure zone. Furthermore, our findings offer insights into the discrepancies observed in fracture energy measurements obtained through various testing methods. This study enhances the understanding of intrinsic fracture mechanisms within polymer networks and lays the groundwork for the design of tougher polymer materials.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Xiaohui Meng,Teng Wu,Dong Qiu
Semicrystalline polymer hydrogels (SC-gels) are intrinsically electrolyte tolerant and over-swelling resistant, emerging as promising candidates for applications in solution environments. However, SC-gels with high mechanical strength are usually brittle. In the present work, by introducing ultra-small hydrophobic nanoparticles , highly-stretchable SC-gels (15 times of its original length) with fracture energy as high as 16.3 MJ m −3 (~8 times of the control) were obtained, without compromising neither the stiffness nor the intrinsic virtues of conventional SC-gels, such as electrolyte tolerance, over-swelling resistance and thermal-modulated ultra-fast recovery. The newly formed crosslinks between these hydrophobic nanoparticles and crystallites in SC-gels are found to be the key for such improvement in toughness; while the chemistry of the nanoparticles themselves are less determining. Therefore, different ultra-small hydrophobic nanoparticles can be incorporated into these tough SC-gels, provided their surface capping agents are similar.
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
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Shuting Wang,Chunyu Wong,Yunsong Pang,Yongdong Wu,Zhenwei Yu,Xiaoliang Zeng,Rong Sun
The inherent conflict between interfacial toughness and bulk energy dissipation in elastomers poses a challenge for achieving optimal adhesion. Here, this work reports a molecular design strategy for constructing poly(urethane-urea-thioctic acid) (PU-TA) elastomers with superior adhesive properties (adhesion strength of 611 ± 22 kPa and adhesion energy of 2723 ± 82 J m −2 ), high stretchability (8579%), and excellent softness (low Young's modulus of 147 kPa). This is realized via introducing multiple hydrogen bonds (H-bonds) into the PU-TA elastomers: The H-bonds at interfaces establish interfacial linkage, and the bulk H-bonds inhibit the chain segments, resulting in high fracture energy. Furthermore, a correlation analysis demonstrates that bulk energy dissipation dominates role key in regulation of adhesion energy compared with interfacial toughness. This molecular-level strategy provides a new sight into the design of superior adhesives suitable for diverse applications in the field of advanced packaging.
研究领域:
材料科学
·
高分子化学
·
机械工程
·
胶粘技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Li,Zhenyu Xu,Long Li,Junjie Wei,Wenqin Wang,Zejun Yan,Tao Chen
Hydrogel based triboelectric nanogenerators (H-TENGs) are deemed as one of most promising flexible energy harvesting and self-powered systems due to its multifunctionality, but the poor mechanical properties of hydrogel electrode bring a major risk of shortening the service life of H-TENGs in case of huge physical impact. Herein, a durable conductive hydrogel electrode with breakage-resistant capacity is developed utilizing the Hofmeister effect on starch polymers through solvent-exchange strategy. Owing to bundled starch chains within hydrogel, the breakage-resistant hydrogel electrode possesses excellent mechanical reliability, including outstanding modulus, fracture energy, anti-puncture capacity and long-term stability. Furthermore, the reliable hydrogel electrode endows triboelectric nanogenerator with good electrical output performances and superb damage immunity, prolonging its service life under accidental physical impact. More significantly, this fabricated triboelectric nanogenerator shows great potential in high-impact application. This investigation offers a versatile and effective way to design next generation hydrogel-based triboelectric nanogenerator with superior damage immunity and long-service life.
研究领域:
材料科学
·
能源技术
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 5
·1579-1594
·
IF 2.3
Lin Ruijun,Yin Xingshan,Liu Huameng,Chen Lijing,Wu Jianxin,Liu Liang,Gu Yuxin,Li Yong,Lin Xiaofeng,Lin Wenjing,Yi Guobin
Self-matting acrylate has attracted much interest due to excellent weather resistance, hardness, water resistance, and chemical resistance. However, the poor mechanical properties of acrylate limit its application in coatings. To overcome this problem, a series of self-matting acrylate emulsions (SMAE) modified by xylitol-based hyperbranched urethane acrylate (HP-IH) were successfully synthesized. The results revealed that the amount of emulsifier was the primary factor affecting the gloss of the films. Upon the incorporation of HP-IH, the elongation at break and fracture energy of the SMAE films were significantly improved by 52.6% and 59.6%, respectively, due to the internal plastic effect and increased crosslink density induced by HP-IH. The S-2-1.5 sample exhibited the excellent comprehensive performance, i.e., tensile strength of 12.7 MPa, elongation at break of 952%, fracture energy of 71.1 MJ/m 3 , adhesion of 5B, temperature of 5% weight loss at 350 °C, and gloss at 60° of 14.8, respectively, indicating its great application potential in the field of low-gloss coatings.
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
危险品化学品经营许可证（带存储）