JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 16
·6916-6928
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IF 3.5
Tan Xiansheng,Liang Caiying,Bai Shihang,Lan Pei,Ren Yan,Zhao Jianhao,Rong Jianhua
Due to the good biocompatibility, polyvinyl alcohol (PVA) hydrogels have attracted the attention of many biomaterial researchers. However, the low strength and poor toughness of pure PVA hydrogel prepared by freeze–thaw method limit the application. In this study, silica was used to enhance the performances of PVA hydrogel. Different from previous PVA/SiO 2 hydrogels, urea was used to regulate the formation and distribution of silica in PVA, which greatly improved the mechanical properties of hydrogels. The tensile stress and toughness of the obtained PVA(Urea)/SiO 2 hydrogels reached 8.10 MPa and 44.45 MJ/m 3 , which were 39 times and 212 times as that of pure PVA hydrogel, respectively. In PVA(Urea)/SiO 2 hydrogels, SiO 2 had both strengthening and toughening effects on hydrogels, which is very different from the ordinary composite hydrogels. In addition, PVA(Urea)/SiO 2 hydrogels showed unique self-reinforcing characteristics with increasing the number of tensile recoveries in cyclic stretching and recovery tests. Thus, PVA(Urea)/SiO 2 hydrogel with high strength and toughness, constructed by a simple strategy, is a potential candidate in cartilage repair.
研究领域:
生物材料
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材料科学
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医学工程
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xiang Zhang,Xiaoning Liu,Jun Hu,Pan Zhang,Ziming Xu,Dan Wang,Weiping Xu
Hydrogels, known for their unique physical and chemical properties, hold significant potential for various applications. However, the inherent conflict between achieving both high strength and toughness often results in suboptimal mechanical performance, which significantly restricts their practical use. The shell of Discinisca tenuis is a layered natural biomaterial that exhibits high strength and toughness due to slight layer loosening during hydration, inspiring the design of tough hydrogels. Inspired by this biological process, this study developed a biomimetic layered hydrogel using a layered membrane hydration approach, optimizing the structural integrity through hot pressing to mimic the slight layer loosening observed in Discinisca tenuis shells after hydration, resulting in both high strength (55.26 MPa) and high toughness (21.04 MJ/m3). The research results indicate that slight layer loosening after hydration enables the biomimetic layered hydrogel to maintain high structural integrity, facilitating effective interlayer load transfer and achieving high strength, while also reducing spatial constraints, which improves ductility and results in high toughness. Additionally, the excellent energy dissipation capacity of the layered structure gives the hydrogel outstanding impact resistance, comparable to commercial materials like foamed polyethylene, silicone, and energy-absorbing rubber, indicating broad application prospects. In summary, this research proposes a general preparation strategy for tough hydrogels based on biomimetic principles, expected to advance the field of hydrogels.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qiangqiang Wen,Yuwei Ma,Fenglong Zhang,Han Sun,Weixiang Shang,Qiang Wang,Jinxiao Bao
Herein, we report a kind of structural and functional integrated ceramic material with excellent mechanical and optical properties . A series of Er-doped Zr 6 Nb 2 O 17 ceramic samples were prepared by the high-temperature solid-phase method, which showed reversible photochromism from light curry to dark brown under the alternating action of 365 nm UV light and heat treatment at 350 °C. The photochromic process is fully reversible and has good cyclic stability with a maximum photochromic contrast of 20.1%. The fluorescence modulation behavior based on the photochromic reaction can effectively modulate the emission of Er 3+ , and the maximum fluorescence modulation ratio reaches 62%. The best Vickers hardness and fracture toughness values of the prepared Zr 6 Nb 2 O 17 : Er ceramics reached 15.88 GPa and 4.5 MPa m 1/2 respectively. The mechanisms of the observed photochromism, photoluminescence , and fluorescence modulation were studied systematically. This work is expected to provide significant guidance for the development of high-performance colored ceramic materials and broaden its market application field.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Wenwen Guo,Xin Wang,Jiali Huang,Wei Cai,Lei Song,Yuan Hu
To overcome the flammability and brittleness of DGEBA, cardanol was selected to synthesize bio-based epoxy in this work because of its unique structure with both rigid aromatic rings and flexible long fatty chains. A novel intrinsically anti-flammable and self-toughened cardanol-derived novolac epoxy was synthesized through condensation, phosphorylation, and epoxidation processes, with a cardanol-based epoxy monomer without phosphorylation (ECF) as a contrastive sample. TGA results showed that the char yield of ECF-PO(OPh) 2 /DDM was much higher than those of DGEBA/DDM and ECF/DDM thermosets due to the catalytic charring effect of phosphate species. The DGEBA/DDM and ECF/DDM thermosets exhibited high flammability, whereas the ECF-PO(OPh) 2 /DDM possessed exceptional anti-flammability. Specifically, the cured ECF-PO(OPh) 2 /DDM possessed a high LOI value of 33.5 % and UL-94 V-0 rating; the PHRR, THR, and TSP values measured by cone calorimeter test were declined by 69.5 %, 28.6 %, and 16.4 % compared to those of the commercial DGEBA/DDM thermoset. Besides, the cured ECF-PO(OPh) 2 /DDM thermoset showed good toughness originated from the long fatty chain of cardanol. This as-synthesized phosphorylated cardanol-derived novolac epoxy possesses simultaneously fire-safe and toughening characteristics, which could be a renewable substitute for commercial DGEBA counterpart to overcome its flammability and brittleness.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 18
·9373-9381
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IF 11.301
Jiajun Xu,Rining Jing,Xiuyan Ren,Guanghui Gao
Breaking through the conventional way of conferring anti-icing ability on hydrogels with addition of organic solvents or inorganic salts, here a novel anti-icing hydrogel with toughness, adhesiveness and high transparency was successfully fabricated by introducing antifreeze protein (AFPS, inspired by fish) into a chemical crosslinking network copolymerized with acrylamide and 2-acrylamide-2-methylpropanesulfonic acid. The hydrogel exhibited surprising stretchability (up to 2400% tensile strain), high transparency (over 90% transmittance) and outstanding reversible adhesive performance bonding to different materials and even human skin. Meanwhile, the inhibition of ice crystal growth based on AFPS molecules also conferred anti-icing ability on the hydrogels, so that the toughness and adhesiveness of the hydrogels remained stable at −10 °C. Additionally, the existence of sulfonic groups also endowed the hydrogels with deformation sensitivity to act as strain or pressure sensors to accurately monitor human motions and even subtle physiological signals. Therefore, the novel anti-icing strategy would provide new insight for a new generation of hydrogel sensors.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Peng Zhang,Lei Kan,Xinyue Zhang,Rui Li,Chuanqi Qiu,Ning Ma,Hao Wei
Multiple hydrogen bonds have been widely used to form a supramolecular network and endow materials with enhanced mechanical strength, good elasticity, and/or self-healing properties. In this study, 2-ureido-4[1H]-pyrimidone (UPy) compounds were synthesized and chemically grafted onto the side chain of epoxy resins. The UPy-modified epoxy resin demonstrated substantial improvements in toughness and elasticity compared with unmodified epoxy resin as proven by a tensile test and distortion test. The breaking elongation of the UPy-modified epoxy resin was 5 times higher than that of unmodified epoxy resin under a tensile test. In addition, the fracture mechanism of the modified epoxy resin matched with the ductile fracture rather than the brittle fracture of unmodified epoxy resins. The introduction of quadruple hydrogen bonds by chemical modification may provide a simple and effective way to design and prepare highly flexible thermosetting resin materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 2
·449
·
IF 5
Jingyuan Hu,Liyue Zhang,Mingxuan Chen,Jinyue Dai,Na Teng,Hongchi Zhao,Xinwu Ba,Xiaoqing Liu
To overcome the high flammability and brittleness of epoxy resins without sacrificing their glass transition temperature (Tg) and mechanical properties, three epoxy-terminated hyperbranched flame retardants (EHBFRs) with a rigid central core and different branches, named EHBFR-HB, EHBFR-HCM, and EHBFR-HBM, were synthesized. After chemical structure characterization, the synthesized EHBFRs were introduced into the diglycidyl ether of bisphenol A (DGEBA) and cured with 4, 4-diaminodiphenylmethane (DDM). The compatibility, thermal stability, mechanical properties, and flame retardancy of the resultant resins were evaluated. Results showed that all three EHBFRs could significantly improve the fire safety of cured resins, and 30 wt. % of EHBFRs (less than 1.0 wt. % phosphorus content) endowed cured DGEBA with a UL-94 V-0 rating. In addition, the increased rigidity of branches in EHBFRs could increase the flexural strength and modulus of cured resins, and the branches with appropriate rigidity were also beneficial for improving their room temperature impact strength andTg.Keywords:hyperbranched flame retardant;toughness;bio-based;epoxy resin
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chenglu Lian,Zhihua Long,Wei Qian,Zhichen Guan,Kun Huo,Yinqun Hua,Jie Cai
Thermal barrier coating materials play a crucial role ensuring the efficient and stable operation of gas turbines. The thermophysical and mechanical properties of GZ 1-x -GT x (x = 0, 0.1, 0.3, 0.5) composite ceramics, as well as the corrosion resistance properties against calcium magnesium aluminum silicate (CMAS) at 1250 °C, were investigated. The results indicated that the overall properties of Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics significantly improved with an increase in the second phase GdTaO 4 content. Among all the ceramics designed, GZ 0.5 -GT 0.5 exhibited the lowest thermal conductivity (0.920 W m −1 K −1 at 800 °C) and the highest fracture toughness (2.02 MPa m 1/2 ). Additionally, the molten CMAS interacted with the Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics, forming a dense apatite layer, which positively contributed to inhibiting CMAS infiltration. Considering its excellent thermal, mechanical, and corrosion resistance properties, Gd 2 Zr 2 O 7 -GdTaO 4 composite ceramics are considered a promising material for thermal barrier coatings.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
GIANT
·
2023
·
IF 7
Wenlei Zhang,Yang Gao,Yifan Zhou,Hou Wu,Zhigang Suo,Tongqing Lu
Adhesives are commonly assessed by two properties: strength and toughness. Here we study how strength and toughness are affected by adhesive thickness. We sandwich gelatin adhesives of various thicknesses between glass substrates. The transparency of the adhesives and substrates enables us to observe crack nucleation and growth. We measure strength by lap shear of samples without precrack, and measure toughness by lap shear of samples with precrack. Our data show a characteristic adhesive thickness, about 0.5 mm. For adhesives below the characteristic thickness, strength is independent of thickness, but toughness increases with thickness. For adhesives above the characteristic thickness, strength decreases as thickness increases, but toughness is a constant. Strength scatters narrowly for samples of a thin adhesive, but broadly for samples of a thick adhesive. By contrast, toughness scatters narrowly for samples of all thicknesses. This work shows the importance of assessing adhesives of various thicknesses.
研究领域:
生物力学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 100
·56791-56797
·
IF 3.708
Yulin Cui,Mei Tan,Aidi Zhu,Mingyu Guo
Strain hardening and high resilience are two unique mechanical characteristics of many soft biological hydrogels. However, these properties, especially the strain hardening behaviour, are generally not seen in synthetic polymer hydrogels. Here, hydrogels are prepared by free-radical copolymerization of acrylamide and chain-extended vinyl-modified pseudo-polyrotaxane, which acts as a multifunctional crosslinker. The reactive pseudo-polyrotaxane is based on a β-cyclodextrin monomer and amine-terminated PEG–PPG–PEG (Pluronic F127). The obtained hydrogels can be stretched from 10 to more than 26 times their original length before breaking and withstand a compression strain of 95% and even 98% without fracture. Tensile stretching tests show obvious strain hardening behaviours in high stretching and compression deformation regimes. The strain hardening behaviour in stretching deformation is considered to be the orientation and aggregation of the movable crosslinkers along the axial polymer backbone. Moreover, the formation of a second supramolecular network due to the chain-extension effect may also be responsible for it. Highly resilient behaviours with almost no hysteresis and residual strains are also observed even with a maximum strain of λ = 12 because of the inherent freely movable character of the crosslinkers.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Li Jiatian,Khan Abdul Qadeer,Zhao Weiqiang,Lai Zhipeng,Bao Qiankun,Rafique Muhammad,Ye Fazhi,Bai Jie,Zhou Qiang,Mai Liqiang,Wang Zongqian,Liu Enzhao,Zhou Xiang,Liu Zunfeng
The pursuit of biomimetic fibers with simultaneous high toughness and strength persists, despite their inherent trade-offs. However, for artificial spider silk based on gel fiber, it is still unclear for the molecular chain attributes related to the improvement of the strength and toughness. Here, a hydrogel fiber was prepared by mimicking the molecular structure of natural spider silk, and we delved into the molecular chain structure characteristics related to the strength, toughness and damping capacity of gel fiber, such as crosslinking density, molecular chain orientation and hydrogen bond interaction. The results indicate that a certain increase in crosslinking density and molecular chain orientation contributes to the enhancement of tensile strength, while the toughness and damping remain essentially unaltered. The thermal dissociation of hydrogen bond could enhance the toughness in a specific range, while the humidity destruction of hydrogen bond would reduce the toughness. Through well-regulation control of the weight ratio of polyacrylamide (PAM) to poly(acrylic acid) (PAA), the PAM@PAA gel fibers could reach maximum breaking strength of 1.02 GPa, maximum toughness of 149 MJ m −3 , and damping capacity of 95%. PAM@PAA gel fiber has demonstrated excellent wound healing performance and biocompatibility in vivo evaluation as a surgical suture, which indicates its potential in biomedical applications.
研究领域:
生物材料学
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分子生物学
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医学工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2024
·
IF 6.1
Qianglong He,Wenchao Guo,Yunwei Shi,Aiyang Wang,Weimin Wang,Zhengyi Fu
In this study, B 4 C–TiB 2 –graphite ceramic composites were prepared via reactive hot-pressing sintering using B 4 C and TiC as the raw materials. The reaction process, microstructure, and mechanical properties were investigated. The solid-phase reaction is a diffusion-controlled process, wherein the B atoms diffuse into TiC and react to form TiB. Thereafter, TiB 2 is generated with the entry of subsequent B atoms. A core–shell structure is formed, wherein TiB 2 particles are wrapped by layered graphite. The products TiB 2 and graphite inhibit the growth of B 4 C matrix grains, which are instrumental in fine grain strengthening. In addition, the novel TiB 2 –graphite-agglomerated structure significantly improves the fracture toughness of the ceramic composites through crack deflection, bridging, and branching toughening mechanisms. Therefore, the comprehensive properties of B 4 C–TiB 2 –graphite ceramic composites are better than those of pure B 4 C ceramics. Specifically, the fracture toughness is approximately 6.77 MPa m 1/2 , which is considerably higher than that of pure B 4 C ceramics (2.47 MPa m 1/2 ).
研究领域:
材料科学
·
陶瓷工程
✓ 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）