ADVANCED MATERIALS
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2020
·Vol. 32
·期 34
·2002695
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IF 27.398
Zongpu Xu,Mingrui Wu,Weiwei Gao,Hao Bai
Flexible and transparent substrates play a fundamental role as a mechanical support in advanced electronic devices. However, commonly used polymer films, such as polydimethylsiloxane, show low tear resistance because of their crack sensitivity. Herein, inspired by the excellent mechanical robustness of the skin and its fibrous structure, an epoxy-resin-based composite with a flat silk cocoon as a reinforcing fiber network is fabricated. With only 1 wt% of silk fiber, the tensile strength and modulus of the as-prepared composite film are considerably increased by 300% and 612% compared to those of pure resin, while still maintaining flexibility and transparency. More importantly, the composite shows remarkable tear resistance: without fracture after ≈30 000 tensile cycles. The potential application of such transparent composite films as mechanically robust substrates for flexible electronics is also demonstrated. In addition, this study represents a bioinspired strategy to construct high-performance functional composite materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shunli Wang,Yinsheng Li,Limei Tian
To overcome the problems of low tear resistance and non-recyclability of conventional carbon fiber reinforced polymer composites (CFRPs), careful design of the polymer binder was required. In this work, woven cross-linkers were introduced into the polymer structure to prepare high strength and toughness polyurethane binders with recyclability, named WPAN 0.5 . The results showed that WPAN 0.5 exhibit excellent tensile strength (86.7 MPa), high toughness (350.6 MJ m −3 ) comparable to Darwin’s bark spider silk, and excellent solvent and thermal stability. Simulation and test results demonstrated excellent energy dissipation in woven polymers. CFRPs were then prepared by combining polyurethane binders with carbon fiber. The results showed that the WPAN 0.5 -CF exhibited recyclability and a record-breaking fracture energy (1721 kJ m −2 ). This strategy provided new ideas for the design of polyurethane elastomer and carbon fiber binders.
研究领域:
材料科学
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qingbo Bao,Huijie Li,Youjie Rong,Jianhua Fei,Xiaomin Zhang,Zhuang Zhao,Jian An,Xiaobo Huang
Photocurable gels have broad application prospects in biomedicine, bionics, flexible wearable devices and other fields. However, there are still some problems in the current photocurable gels, such as notch sensitivity, that is, poor tear resistance. In this study, we provided a photocurable gel with excellent tear resistance. The gel prepolymer is mainly composed of hydroxymethylacrylamide (NAM) and cellulose nanocrystals (CNC) modified with dopamine hydrochloride (DA), referred to as DA@CNC. After photocuring, the prepared gels show excellent mechanical properties such as tear resistance, elasticity and toughness. The introduction of DA@CNC not only endows gels with a large amount of energy dissipation through hydrogen bond crosslinking, but also effectively resists crack expansion as a nano-sized reinforcing phase, which greatly improves the tear resistance of the gels. Even at a 40 % gap, the elongation at break of the gel can still reach 1445 %. In addition, the DA can endow the gel with good electrical conductivity and excellent sensitivity (GF = 23.8). Some flexible wearable devices like finger sleeve and wristband can be customized by photocurable 3D printing using the gel with high toughness. This high-performance gel has great application potential in flexible wearable devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Changjie Yin,Boyu Wang,Huimin Li,Dezhong Yin,Qiuyu Zhang
The vinyltriethoxysilane grafted styrene-butadiene rubber (SBR-g-VTES) was successfully synthesized using the ARGET-ATRP (electron transfer activated regenerative atom transfer radical polymerization) method in latex. Then, SBR-g-VTES/SiO 2 composites were prepared without a silane coupling agent. The effect of various reaction conditions on the grafted yield, properties, and morphology of SBR-g-VTES was investigated, and the influence of different silica amounts on the properties of SBR-g-VTES/SiO 2 composites was also discussed. The polymerization process conformed to the characteristics of active/controllable. The reaction condition SBR/CuBr 2 /TPMA/VC (100.00/0.0010/0.0015/0.30) was chosen. The tensile strength of SBR-g-VTES reached 4.20 MPa, and the tear strength reached 40.00 MPa. When the amount of silica was 30 wt%, the bound rubber, tensile strength, tear strength, and hardness of SBR-g-VTES/SiO 2 composites reached 78%, 12.30 MPa, 97 MPa, and 91 shore A, respectively. The Akron abrasion is 0.03 cm 3 ; a good balance between the wet sliding resistance and the low rolling resistance of the material can be realized. Meanwhile, SEM analysis results showed that the compatibility between silica and the rubber matrix was greatly improved by grafting VTES; SiO 2 was uniformly dispersed in the SBR matrix with a regular round shape.
研究领域:
高分子科学
·
材料工程
·
化学合成
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纳米复合材料
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橡胶技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Haiming Chen,Chengyi Huang,Kai Lu,Yanzi Gao,Jingling Yan,Zhen Wang
Ionogels with favorable mechanical robustness, high conductivity, and excellent resistance to tear and fatigue are crucial for portable energy devices and/or flexible electronics. However, the intrinsic plasticizing effect and network dilution caused by ionic liquids (IL) compromise their mechanical robustness. Herein, a confinement-locking strategy is developed to produce mechanically robust and fatigue-resistant phase-separate ionogels. First, a portion of soft segments is confined within the hard domains to buffer stress and facilitate hydrogen bonding (H-bonding) assemblies reorganization. Second, the IL are confined within soft phases, which eliminates the interference with hard segments and consequently enhances the stability of H-bonding networks. The synergistic effects of robust H-bonding networks, extensive supramolecular interactions between soft segments (polycaprolactone, PCL) and IL, strain-induced crystallization of PCL, and stress-damping by confined soft segments endow the ionogel with an exceptional combination of tensile strength (∼45.4 MPa), fracture toughness (256.1 MJ·m − 3 ), elongation at break (1576.6%), elastic recovery (>91%), ionic conductivity (1.04 mS·cm −1 ), tear strength (∼108.1 kJ·m − 2 ), and a record-high fatigue threshold (8796 J·m − 2 ), enabling the ionogel with great potential in perceptive artificial ligaments.
研究领域:
材料科学
·
柔性电子学
·
高分子物理
·
储能技术
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xv Zhang,Guihua Yang,Qimeng Jiang,Jiaming Fan,Shaoguang Wang,Jiachuan Chen
Traditional packaging materials feed the growing global food protection. However, these packaging materials are not conducive to environment and have not the ability to kill bacteria. Herein, a green and simple strategy is reported for food packaging protection and long-term antibacterial using carboxymethylcellulose-based photothermal film (CMC@CuS NPs/PVA) that consists of carboxymethyl cellulose (CMC) immobilized copper sulfide nanoparticles (CuS NPs) and polyvinyl alcohol (PVA). With satisfied oxygen transmittance (0.03 cc/m 2 /day) and water vapor transmittance (163.3 g/m 2 /day), the tensile strength , tear strength and burst strength reached to 3401.2 N/m, 845.7 mN and 363.6 kPa, respectively, which could lift 4.5 L of water. The composite film had excellent photothermal conversion efficiency and photothermal stability. Under the irradiation of near infrared (NIR), it can rapidly heated up to 197 °C within 25 s. The antibacterial analysis showed that the inhibition rate of composite film against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) could all reach >99 %. Furthermore, the synthesized CuS NPs was well immobilized and the residual rate of copper kept 98.7 % after 10 days. Noticeably, the composite film can preserve freshness of strawberries for up to 6 days. Therefore, the composite film has potential application for food antibacterial protection.
研究领域:
材料科学
·
食品科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Mingshan Chen,Zhiyu Hu,Haoyuan Zheng,Jiesheng Wang,Xiaowen Xu
While hydrogels have potential for food packaging, limited research on hydrogels with excellent mechanical performance and antibacterial activity for preserving chicken breasts. Herein, we created antibacterial hydrogels by embedding methyl-β-cyclodextrin/thyme oil inclusion complexes (MCD/TO-ICs) into a polyvinyl alcohol matrix containing dendrobium polysaccharides and guar gum in varying ratios using freeze-thaw cycling method. The resulting hydrogels exhibited a more compact structure than those without MCD/TO-ICs, enhancing thermal stability and increasing glass transition temperature due to additional intermolecular interactions between polymer chains that inhibited chain movement. XRD analysis showed no significant changes in crystalline phase, enabling formation of a 3D network through abundant hydrogen bonding. Moreover, the hydrogel demonstrated exceptional durability, with a toughness of 350 ± 25 kJ/m 3 and adequate tearing resistance of 340 ± 30 J/m 2 , capable of lifting 3 kg weight, 1200 times greater than the hydrogel itself. Additionally, the hydrogels displayed excellent antimicrobial activity and antioxidant properties. Importantly, the hydrogels effectively maintained TVB-N levels and microbial counts within acceptable ranges, preserving sensory properties and extending the shelf life of chilled chicken breasts by four days. This study highlights the potential of MCD/TO-IC-incorporated polysaccharide hydrogels as safe and effective active packaging solutions for preserving chilled chicken in food industry.
研究领域:
食品科学
·
材料科学
·
生物技术
·
包装技术
✓ 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）