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Now showing items 1 - 15 of 15

  • Fracture behavior and deformation mechanisms of polypropylene/ethylene-propylene-diene blends

    Ao, Yuhui   Feng, Fang   Zhang, Huixuan  

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  • Enhanced tribological performance of PEEK/SCF/PTFE hybrid composites by graphene

    Liu, Liu   Yan, Fei   Gai, Fangyuan   Xiao, Linghan   Shang, Lei   Li, Ming   Ao, Yuhui  

    Polyetheretherketone (PEEK)/short carbon fiber (SCF)/polytetrafluoroethylene (PTFE)/graphene (GE) composites (PSPGE) with different weight fractions of GE were prepared successfully. The effect of GE on the tribological behavior of PEEK composites was investigated under different applied pressures, sliding speeds and temperatures. Characterization results revealed that the tribological performance was improved with the increase of GE loading, and 2.0 wt% GE filled PEEK/SCF/PTFE composites had the lowest friction coefficient and wear rate. The PSPGE exhibited excellent lubrication and wear resistance efficiency especially under harsh conditions. Moreover, the improved thermal conductivity of the PSPGE composites allowed friction heat to be transferred and further increased the wear resistance. Thus, this newly developed novel PSP2.0GE composite could be applied to many new fields as an advanced friction material.
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  • Improving interfacial properties of hierarchical reinforcement carbon fibers modified by graphene oxide with different bonding types

    Liu, Liu   Yan, Fei   Li, Ming   Zhang, Mengjie   Xiao, Linghan   Shang, Lei   Ao, Yuhui  

    The deposition of graphene oxide (GO) onto carbon fibers (CF) surface to form a hierarchical reinforcement structure has been achieved via various bonding types: van der Waals forces, zwitterionic interactions and covalent bonds. The functional groups, surface elements, contents of introduced GO, surface structures, morphologies and wettability of GO-deposited CF were characterized by FT-IR, XPS, TGA, Raman, SEM and Dynamic contact angle meter, respectively. Covalently grafting GO onto CF (CF-c-GO) has been proved to be the most effective way to improve the interfacial properties. Compared with pristine CF, the flexural strength, interlaminar shear strength and interfacial shear strength of CF-c-GO composites were increased by 28.7%, 22.7% and 50.6%, respectively. The CF-GO hierarchical composites featured a stronger interfacial bonding as evidenced by the fracture surface analysis, which demonstrated the enhancement in interfacial properties of hierarchical thermoplastic composites.
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  • Superior and versatile interface transition layer with a sandwich-like multiscale rigid-soft dual-locked structure for high performance composites

    Jin, Lin   He, Yulin   Shang, Lei   Liu, Liu   Zhang, Mengjie   Li, Ming   Ao, Yuhui  

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  • Multiple dye-doped silica cross-linked micellar nanoparticles for colour-tuneable sensing of cysteine in an aqueous media and living cells.

    Gai, Fangyuan   Li, Ling   Yu, Yifan   Han, Zongyi   Jin, Lei   Ao, Yuhui   Liu, Yunling   Huo, Qisheng  

    This work demonstrated the design and synthesis of multiple dye-doped silica cross-linked micellar nanoparticles (MD-SCMNPs) by encapsulating three organic dyes (fluorescein derivative (FCD), coumarin derivative (HCE) and Rhodamine b (RhB)) in SCMNPs cores for colour-tuneable sensing of cysteine (Cys) in aqueous media and in living cells. In the presence of Cys, HCE exhibited blue emission, and RhB exhibited purple emission, while FCD reacted with Cys and exhibited green fluorescence "turn-on" in the core of MD-SCMNPs. This green-light-emitting sensing product may cause "step by step" fluorescent resonance energy transfer (FRET) from HCE to the sensing product and then to RhB. Based on the FRET process in the core, MD-SCMNPs can quantitatively detect Cys by a colour change with a low limit of detection (LOD) of 0.3=E2=80=AFmuM in living cells. Furthermore, MD-SCMNPs exhibited ultrasmall size (12=E2=80=AFnm) and excellent dispersity and biocompatibility, which could potentially be used as a visualized Cys sensor for health monitoring and disease prediction in the human body. Copyright =C2=A9 2018. Published by Elsevier Inc.
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  • A DOPO-based phosphorus-nitrogen flame retardant bio-based epoxy resin from diphenolic acid: Synthesis, flame-retardant behavior and mechanism

    Chi, Zhiyuan   Guo, Zongwei   Xu, Zice   Zhang, Mengjie   Li, Ming   Shang, Lei   Ao, Yuhui  

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  • A highly active bio-based epoxy resin with multi-functional group:synthesis,characterization,curing and properties

    Shang, Lei   Zhang, Xiuping   Zhang, Mengjie   Jin, Lin   Liu, Liu   Xiao, Linghan   Li, Ming   Ao, Yuhui  

    A bio-based epoxy resin, triglycidyl ether of resveratrol (TGER), was synthesized based on the renewable resveratrol deriving from tannins. The structure and properties of TGER have been characterized by H-1 NMR, C-13 NMR, FTIR, GPC and viscosity measurement. Besides, systematical investigation was carried out on the curing reaction of TGER and diaminodiphenylmethane (DDM), assisted by the characterization of mechanical properties and thermal properties of cured TGER/DDM by means of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis (DMA), flexural and impact measurement. Non-isothermal and isothermal curing analysis showed that TGER/DDM system, deriving from autocatalytic curing reaction, possessed 40 degrees C lower curing temperature (84 degrees C) than bisphenol A diglycidyl ether (DGEBA) (124 degrees C) and much lower activation energy than DGEBA/DDM system calculated by Kissinger equation. DMA revealed that TGER possessed high glass transition temperature (T-g =3D 148 degrees C) and glassy storage modulus (2.391 GPa@23 degrees C). Meanwhile, TGER/DDM thermosets also exhibited good mechanical properties and heat resistance, illustrating that multi-phenol group and stilbene group of resveratrol endowed polymer with high cross-linking density and rigidness. Therefore, TGER could be a promising alternative to petroleum-based epoxy resin.
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  • Improvement of interfacial strength and thermal stability of carbon fiber composites by directly grafting unique particles:functionalized mesoporous silicas

    Jin, Lin   Zhang, Mengjie   Li, Honglong   Li, Ming   Shang, Lei   Xiao, Linghan   Ao, Yuhui  

    A facile process was used to introduce vinyl functionalized mesoporous silicas onto a carbon fiber to improve the interfacial strength of composites. The characterization of successfully grafted vinyl groups on mesoporous silicas was determined by Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The morphology of the vinyl functionalized mesoporous silicas uniformly distributed on the surface of carbon fiber was characterized by scanning electron microscopy (SEM), which indicated that the homogeneous dispersion of vinyl functionalized mesoporous silicas on a fiber may benefit the interfacial adhesion of matrix. Interfacial shear strength and thermal stability of the composites were improved by increasing the vinyl functionalized mesoporous silicas. This effect arose from the fact that functionalized mesoporous silicas serve as a "rivet joint" produced from chemical bonding and physical interlocking among the mesoporous silicas, carbon fiber and matrix. Notably, introduction of functional mesoporous silicas may be applied for fabricating high performance, multifunctional carbon fiber composites.
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  • Fracture behavior and deformation mechanisms of polypropylene/ethylene-propylene-diene blends

    Ao, Yuhui   Feng, Fang   Zhang, Huixuan  

    The fracture behavior and deformation mechanism of polypropylene (PP)/ethylene-propylene-diene rubber (EPDM) were studied by scanning electron microscopy and transmission electron microscopy analyses. The deformation mechanism was investigated under different conditions. Voids were seen under all the conditions because of matrix shear yielding, indicating that rubber particle cavitation took place during the blend fracture process; moreover, the void size and density increased as the fracture surface was approached. However, the void density and extent of elongation of the rubber particles in the deformation zone decreased with increasing test speed rate. Many voids were positioned in the rubber particles, confirming that matrix shear yielding initiated by rubber particle cavitation was the main deformation mechanism during ductile fracture in the matrix.
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  • A study on regulating the conjugate position of NLO chromophores for reducing the dipole moment and enhancing the electro-optic activities of organic materials

    Zhang, Hui   Tian, Yanxin   Bo, Shuhui   Xiao, Linghan   Ao, Yuhui   Zhang, Ji   Li, Ming  

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  • The suitable itaconic acid content in polyacrylonitrile copolymers used for PAN-based carbon fibers

    Fu, Zhongyu   Liu, Baijun   Deng, Yunjiao   Ma, Jianying   Cao, Chunlei   Wang, Jing   Ao, Yuhui   Zhang, Huixuan  

    This article was to provide some new insights into the influences of itaconic acid (IA) content in polyacrylonitrile (PAN) copolymers on polymerization, structural evolution, thermal behaviors and carbon yield relatively comprehensively. High IA containing poly(acrylonitrile-co-itaconic acid) (PAI) oligomers were successfully extracted from PAI copolymers with 2.0 and 3.0 mol % IA. PAI copolymers with 0.5 mol % and 1.0 mol % IA possessed more cyclized structures, conjugated carbonyl group, conjugated nitrile group, and less b-amino nitrile group as well as faster structural evolution rate than those of the other three PAI copolymers. Kinetic parameters indicated that excessive IA content in PAI copolymer did not have advantages in promoting cyclization reaction. The PAI copolymers with 0.5 wt % to 1.0 mol % IA possessed better crystalline parameters as well as higher carbon yield than those of the other two PAI copolymers after carbonization at 1350 degrees C. In summary, PAI copolymers with 0.5 mol % to 1.0 mol % IA will be more suitable for fabricating of high performance PAN-based carbon fibers. (C) 2016 Wiley Periodicals, Inc.
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  • The influence of stabilization efficiency on skin–core structure and properties of polyacrylonitrile fibers

    Sun, Lihao   Shang, Lei   Xiao, Linghan   Zhang, Mengjie   Ao, Yuhui   Li, Ming  

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  • Low‐temperature fast curable behavior and properties of bio‐based carbon fiber composites based on resveratrol

    Guo, Zongwei   Zhang, Mengjie   Zhang, Yuansi   Liu, Liu   Li, Ming   Shang, Lei   Ao, Yuhui  

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  • Improving tribological properties of phenolic resin/carbon fiber composites using m‐Si 3 N 4 @PANI core–shell particles

    Fan, Chunlei   Li, Honglong   Jin, Lin   Zhang, Mengjie   Xiao, Linghan   Li, Ming   Ao, Yuhui  

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  • The influence of oxygen on skin-core structure of polyacrylonitrile-based precursor fibers

    Sun, Lihao   Li, Ming   Shang, Lei   Xiao, Linghan   Liu, Yu   Zhang, Mengjie   Ao, Yuhui  

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