Small
·
2023
·
IF 13.3
Dengfeng Zhang,Xiujuan Li,Junyue Li,Qiye Wang,Xuemei Dong,Yueyue Wu,Zifan Li,Xinyi Xie,Zhengdong Liu,Fei Xiu,Wei Huang,Juqing Liu
Ionogels are extremely soft ionic materials that can undergo large deformation while maintaining their structural and functional integrity. Ductile ionogels can absorb energy and resist fracture under external load, making them an ideal candidate for wearable electronics, soft robotics, and protective gear. However, developing high-modulus ionogels with extreme toughness remains challenging. Here, a facile one-step photopolymerization approach to construct an acrylic acid (AA)-2-hydroxyethylacrylate (HEA)-choline chloride (ChCl) eutectogel (AHCE) with ultrahigh modulus and toughness is reported. With rich hydrogen bonding crosslinks and phase segregation, this gel has a 99.1 MPa Young's modulus and a 70.6 MJ m −3 toughness along with 511.4% elongation, which can lift 12 000 times its weight. These features provide extreme damage resistance and electrical healing ability, offering it a protective and strain-sensitive coating to innovate anticutting fabric with motion detection for human healthcare. The work provides an effective strategy to construct robust ionogel materials and smart wearable electronics for intelligent life.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Chong Wang,Pei-Yi Liu,Ze-Zhong Lin,Yu Chen,Hai-Chao Li
Numerous plasticizers have been developed to acquire the traditional soft poly(vinyl chloride) (PVC) that is characteristic of a high elongation at break, but a low modulus of <70 MPa. Special highly-stretchable PVCs with high modulus (>70 MPa) are highly desirable for widening the application fields of PVC materials. Herein, a series of star copolymers with hyperbranched polyethylenimine (PEI) as core and poly(ε-caprolactone) (PCL) as shell (PEI-PCL) were utilized as plasticizers to prepare functional highly-stretchable semi-rigid plasticized PVC materials. Under the 0.5 weight ratio of PEI-PCL to PVC, the obtained plasticized PVCs showed the highest modulus of around 392 MPa under the assuring of >400% elongation at break, which was nearly four-fold of the most rigid plasticized PVC materials ever-reported. Through the further DSC and FTIR characterizations and the comparison with linear PCL plasticizers, the reason for so rigidity was ascribed as that the guest-encapsulation capability of PEI-PCLs led to the physical crosslinking of PVC chains by the amidated PEI core through the dense hydrogen-bonds. Furthermore, PEI-PCLs could disperse hydrophilic dyes homogeneously into PVC matrix, resulting in colorful or photoluminescent PVC materials.
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
Polymer Chemistry
·
2024
·Vol. 15
·期 47
·4824-4834
·
IF 4.1
Zidie Song,Li Liu,Pengbo Zhang,Kangle Xue,Zibo Hua,Tao You,Yiqi Wu,Hong Cui,Zhen Hu,Yudong Huang
Degradable epoxy resins are designed to address the environmental pollution caused by traditional epoxy resins. However, incorporating the degradability of dynamic covalent bonds in the design of degradable resins often compromises the rigidity and heat resistance of the material, rendering it less suitable for high-temperature applications, such as those used in deep space exploration. This paper presents the creation of an innovative, entirely bio-based epoxy monomer. Its cyclic rigid dynamic bonds confer a high tensile modulus (4.06 GPa), glass transition temperature (Tg = 240 °C), notable creep resistance with full shape recovery at 180 °C, and remarkable degradability, dissolving entirely in a 1 M HCl solution in just 60 minutes at 50 °C. The preparation of the diacetal was accomplished by reacting vanillin with xylitol under acidic conditions. This was followed by a reaction with bio-derived epichlorohydrin to produce bio-based, multifunctional epoxy monomers featuring hydroxyl groups and bicyclic acetal structures, representing a new strategy for eco-friendly polymer synthesis. This monomer was then cured with a hardener to create an epoxy crosslinked network. The eco-friendly raw materials are easily obtainable, and the synthesized cross-linked network structure is exceptionally high-performing. This makes it a potential material for use in deep space exploration and other tough environments, and it provides a benchmark for synthesizing chemically degradable epoxy resins suitable for extreme conditions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 10
·49971
·
IF 2.52
Xinqiu Hong,Yongjing Xu,Liming Zou,Yan Vivian Li,Junwei He,Jiongxin Zhao
Polyvinyl alcohol (PVA) fibers were prepared using PVA with different degree of polymerization (DP) under the same wet spinning process. The effect of the DP of PVA on the structures and properties of PVA and PVA fibers were studied by using nuclear magnetic resonance hydrogen spectroscopy ( 1 H-NMR), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermo gravimetric analysis (TGA), and environmental scanning electron microscope (ESEM). The results showed that DP had little effect on the crystallinity and tacticity of PVA, but had a positive effect on melting temperature, and initial decomposition temperature of PVAs. The hot drawing ratio determined by the spinning process where the PVA fibers could be continuously collected without breaking. The drawing ratio was decreased with an increase of DP, resulting in an increase of the final fiber diameter. The PVA fibers with medium DP and medium size demonstrated high strength and high modulus, but relatively low breaking elongation. It suggested that high DP of PVA was not a guarantee of high strength and high modulus PVA fibers, but rather a primary structure factor. The fiber performance was determined by a comprehensive effect combining a variety of factors including polymer properties and spinning conditions. It provided a guideline for PVA fiber manufacture that the PVAs with different DP require different spinning processes to obtain optimal fiber performance.
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
Materials Today Communications
·
2021
·
IF 3.383
Weidong Han,Xin Qian,Hongbo Ma,Xuefei Wang,Yonggang Zhang
The nickel electroplating followed by a further copper electroplating process was conducted on high modulus carbon fibers (HMCFs), and the HMCFs were oxidized in nitric acid prior to the Ni-plating process. Effect of the electroplating process on the microstructure and mechanical properties of HMCFs was investigated. Uniform nickel particles were observed on the surfaces of Ni-plated HMCFs and fiber diameter increased from 5.0 μm to 6.1 μm. With a further Cu-electroplating process, the fiber diameter continued increasing to 7.5 μm. The Ni-plating process resulted in increased surface roughness, whereas the surface RMS and Ra values dropped significantly after the Cu-plating process. Owing to the Ni-plating treatment, the relative content of carbon element on fiber surfaces decreased from 96.54 % to 36.74 %. After a further Cu-plating process, the relative content of Cu element on HMCF surfaces was as high as 54.01 %. The electroplating process resulted in decreased tensile modulus from 415.71 GPa to 407.71 GPa. By contrast, the tensile strength of electroplated HMCFs increased by 1.1 % due to the reduction of fiber defects and stress concentration. Results also showed that both the Ni-plating and Cu-plating process could lead to significant decreases in the values of electrical resistance and resistivity.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Jianing Guo,Runze Liu,Zichun Ding,Yuhang Wang,Jinyan Wang,Xigao Jian,Lishuai Zong
With the rapid development of 5G communication technology, it is difficult to balance the comprehensive performance of packaging substrate materials in integrated circuits. In this study, a high-temperature resistant, high-modulus phthalazinone-bearing tetrafunctional epoxy resin (TEPZ) was used to modify an industrial multi-resin (benzoxazine/bismaleimide/biphenyl epoxy resin) system to prepare a composite system. On the basis of this system, the addition of KH560 modified SiO 2 gives the system the advantage of a low coefficient of thermal expansion. The prepared compound system has excellent comprehensive properties. The TGA and DMA tests showed that the system had excellent thermal properties, with the best performing experimental group reaching 5 % heat loss temperatures of 421 °C and 462 °C in nitrogen and air test atmospheres, respectively, and the T g of the composites reaching 309 °C; mechanical tests showed that the composites had a flexural modulus of 33 GPa; the TMA test results showed that the composites' z-axis compression CTE was as low as 17 ppm/°C. We believe that this new composite system can provide new ideas for the design concept of new generation of electronic packaging substrate materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Peng Xu,Hantian Lu,Yushan Wu,Mei He,Gang Li,Xiaoping Yang,Faxiang Qin,Hua-Xin Peng
To improve interfacial properties of high-modulus carbon fiber (HMCF) composites, a nanostructured interphase with multiple interaction is constructed by molecular assembly of naphthalene diimide (NDI) on HMCF surface. NDI can react with the matrix while being compatible with the graphite-like carbon fiber surface, which improves the interfacial adhesion. The surface physicochemical properties and surface energy of different HMCFs were investigated. The interfacial properties of HMCF composites were measured by interfacial shear strength (IFSS) test and transverse fiber bundle tensile (TFBT) test. A significant improvement of the IFSS for NDI assembled HMCF of 64 % compared to that of unsized HMCF was obtained, which were attributed to the release of stress concentration and crack propagation from HMCF surface toward the nanostructured interphase with multiple interaction. The schematic models of interphase reinforcing mechanisms were proposed accordingly.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yushan Wu,Hantian Lu,Faxiang Qin,Shan Yang,Peng Xu,Hua-Xin Peng
Interfacial properties are a key factor influencing the overall performance of carbon fiber reinforced polymer composites (CFRPs). A novel interphase with “rigid-flexible coupling” crosslinked network is established by introducing supramolecule pseudopolyrotaxane (PPR) on the high modulus carbon fiber (HMCF) surface to improve interfacial properties of CFRPs. Our design utilizes the unique molecular necklace structure of PPR composed of β-cyclodextrin (β-CD) and polyetheramine (PEA). Here, hydroxyl-rich β-CD acts as crosslinking sites and catalyst to enhance interfacial crosslinking density and the mobile main chain PEA serves as an internal stress relaxant to dissipate stress, thereby simultaneously improving the stiffness and toughness of the interphase. The resultant CFRPs exhibit excellent interfacial properties with a 90 % rise in interfacial shear strength (IFSS) and 156 % enhancement in transverse fiber bundle test (TFBT) strength in comparison with desized HMCF composites. This work provides a new strategy for preparing carbon fiber reinforced polymer composites with excellent interfacial properties.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jin Jia,Jun-Hong Liu,Shan Wang,Xiang-Jun Zha,Kai Ke,Zheng-Ying Liu,Petra Pötschke,Ming-Bo Yang,Wei Yang
Wearable strain sensors with high sensitivity and linear resistance signal response to strain are urgently demanded for human–machine interface, which can be tuned by introducing uneven surface mechanics distribution onto fiber surfaces via structural heterogeneity for fibrous elastomer fiber mat sensors. Yet it is still of great challenge to build micro- or nano-scale heterogeneous structures on fiber surfaces in a facile and scalable way without using templates. Herein, we report a plastic nanosphere-decorated elastomer fiber mat strain sensor with a zoned surface strain energy release characteristic, designed based on analysis of material match and structural mechanics. Surface mechanics analysis confirms that the as-designed sensor shows a controllable strain energy release area, significantly improving sensing stability thanks to effective restriction of micro-crack propagation in conductive pathways. In particular, fibrous mat sensor with high-density nanospheres shows very low fluctuation in strain sensitivity variation (±0.05 for strain ≤ 30 %), i.e., good linearity in the resistance response to strain, while that for the control sensor is ± 10.0 for strain ≤ 16 %. Such a fiber mat strain sensor can not only be applied for real-time sensing of object deformations for human–machine interface and intelligent control, but also in hydrophobic porous elastomeric packaging materials and triboelectric devices.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2025
·Vol. 68
·期 6
·1-16
·
IF 4.9
Yang Xuxuan,Zhang Qian,Nie Xiongfeng,Xu Ziyang,Liu Wenguang
The development of a meniscal substitute that conforms to the stringent requirements of high modulus, antiswelling, and shape compatibility continues to pose a significant challenge. Herein, the polycarbonate-based polyurethane (PCU) with a covalent adaptive network is constructed by introducing the Diels-Alder (DA) bonds into the hard segments of PCU as the dynamic covalent cross-linkage. On the one hand, the stability of DA bonds at low temperatures enables them to lock molecular chains within the hard domain in an aqueous environment, thus maintaining the high robustness of the resultant elastomer under physiological conditions. On the other hand, the incorporated DA bonds can be disrupted at high temperatures, facilitating the movement of the molecular chains through heating, thus allowing for the three-dimensional (3D) printing of the meniscus scaffold whose shape closely resembles that of the native tissue. The fabricated meniscus substitute is surgically implanted into the knee joints of rabbits for 12 weeks, with in-vivo outcomes illustratively showcasing its remarkable proficiency in mitigating cartilage surface degradation.
研究领域:
生物材料学
·
组织工程
·
再生医学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Chuqi Shi,Shumei Liu,Yang Li,Yanchao Yuan,Jianqing Zhao,Yi Fu
Our pilot research revealed that the dielectric constant of polyimide (PI) can be reduced and the modulus can be improved by assembling necklace-like interlocking complexes with crown ethers. Not only did we find that these properties of the PI complex still cannot adequately meet the demand of practical applications but also that there was a deterioration in its thermal stability. A functional octa(aminopropyl)silsesquioxane (OAPrS) with a significantly rigid Si-O-Si cage was incorporated into an 18-crown-6 (CE6)-PI (CE6-PI) complex to produce inorganic-organic OAPrS/CE6-PI nanocomposites . By exploiting the synergetic effect of OAPrS and CE6, most properties of the PI were clearly improved. In the case of 3.9 wt% OAPrS and 7.8 wt% CE6, the dielectric constant of PI was reduced by 30%, and Young's modulus and the tensile strength were increased by 106% and 23%, respectively. In addition, the thermal stability of the CE6-PI complex was modified, and its 5% weight loss temperature and glass transition temperature were increased by 31.2 and 11.2 °C, respectively, with the incorporation of 3.9 wt% OAPrS. The indispensable nano-reinforcing role of aggregated OAPrS crystal in the nanocomposite was carefully analysed and verified.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Yingpiao Fu,Hongxin Li,Weiyu Cao
Surface modification of carbon fiber is a traditional research field and many techniques have been developed to improve the adhesion force between fiber and the polymer matrix . However, most studies were focused on the carbon fibers with standard modulus. The surface of high-modulus carbon fiber (HMCF) is difficult to be activated due to the highly inert structure after graphitization. A convenient and effective surface modification method that can simultaneously improve the content of function groups with containing oxygen and nitrogen on the surface of HMCF was developed in this paper. The surface of HMCF was first anodized to be activated by electrochemical oxidation , and then the diethylenetriamine (DETA) was grafted by electrochemical grafting. The effect of the type of electrolyte on the electrochemical grafting of DETA was studied by the addition of NH 4 HCO 3 and (NH 4 ) 2 SO 4 , respectively. The results indicated that the addition of NH 4 HCO 3 electrolyte in DETA solution will promote the grafting and increase the grafted amount on HMCF surface. Moreover, the addition of (NH 4 ) 2 SO 4 electrolyte can not only promote the grafting, but also oxidize the surface of the fibers further to generate more oxygen-containing groups. In addition, the interfacial performance of HMCF composites was significantly improved after modification by this method. Especially, when (NH 4 ) 2 SO 4 was added to DETA solution, the inter-laminar shear strength (ILSS) of HMCF/epoxy composites reached 97.5 MPa, which was 257.1% higher than that of untreated HMCF.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）