Wyniki wyszukiwania dla: Huixuan Zhang

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Effect of structural evolution in high‐temperature thermal oxidative stabilized polyacrylonitrile fibers on carbonized fibers

Yuan Ge, Huixuan Zhang, Huanyang Yu, Zhongyu Fu, więcej

Journal of Applied Polymer Science > 140 > 47 > n/a - n/a

The effect of structure and properties of polyacrylonitrile (PAN) fibers during thermal oxidative stabilization (TOS) stage (especially high‐temperature TOS stage at 270–300°C) on the skin‐core structure of carbonized fibers was studied. The work clarified the reasons for selecting the highest TOS temperature, and also determined the optimal TOS temperature range of obtaining structurally stable carbonized...

artykuł

Waterborne polyurethane acrylate emulsion with dangling chain structure: Simultaneously showing wide damping temperature range and excellent hydrophobic performance

Jingtao Wu, Xiaojuan Wang, Yunjiao Deng, Songsong Li, więcej

Polymers for Advanced Technologies > 34 > 4 > 1265 - 1278

Waterborne polyurethane (WPU) damping material has been drawing much attention in academic field because of its low toxicity compared with polyurethane (PU) damping material. In order to expand the application range of WPU damping materials, it is necessary to further improve the hydrophobicity and damping properties of WPU. A novel dangling chain polyol‐n (DCP‐n, n expressed as average molecular...

artykuł

Waterborne polyurethane‐acrylate‐polyaniline: Interfacial hydrogen bonding for enhancing the antistatic, damping, and mechanical properties

Xiaobo Liang, Yunjiao Deng, Songsong Li, Jingtao Wu, więcej

Polymers for Advanced Technologies > 33 > 9 > 2667 - 2681

Damping coatings can convert kinetic energy into other forms of energy for consumption and have been widely used for vibration and noise reduction in rail trains, aerospace, automobile industry, and other fields. However, many aspects of damping coating such as, damping, water resistance, heat resistance, mechanical properties and antistatic properties require further improvement. In this study, a...

artykuł

Effect of nitrogen pretreatment on the skin‐core structure of thermal oxidative stabilization polyacrylonitrile fibers

Yuan Ge, Zhongyu Fu, Yunjiao Deng, Huixuan Zhang

Journal of Applied Polymer Science > 138 > 36 > n/a - n/a

Polyacrylonitrile precursor was pretreated under nitrogen to study the effect of the extent of cyclization of pretreated fibers on the chemical structure, crystal structure and skin‐core structure of thermal oxidative stabilization (TOS) fibers. Based on the FTIR spectra, the cyclization degree of pretreated fibers was quantitatively calculated by a combination of peak‐fitting and second‐derivative...

artykuł

Hydroxyl‐terminated polybutadiene based waterborne polyurethane acrylate emulsions: Synthesis, characterization, and damping property

Songsong Li, Yunjiao Deng, Zhongyu Fu, Huixuan Zhang, więcej

Journal of Applied Polymer Science > 138 > 17 > n/a - n/a

A new kinds of waterborne polyurethane acrylate (WPUA) dispersions were synthesized based on isophorone diisocyanate (IPDI), hydroxyl‐terminated polybutadiene (HTPB), 1, 4‐butanediol (1, 4‐BDO), polytetramethylene ether glycol (PTMG), dimethylolpropionic acid (DMPA), 2‐ethylhexyl acrylate (EHA), and methyl methacrylate (MMA) as main raw materials. The influence of the HTPB content on the particle...

artykuł

The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

Yuan Ge, Zhongyu Fu, Mingyao Zhang, Huixuan Zhang

Journal of Applied Polymer Science > 138 > 1 > n/a - n/a

The effects of chemical and physical structural evolution of polyacrylonitrile (PAN)‐based carbon fibers precursor during thermal oxidative stabilization (TOS) on the mechanical properties of stabilized fibers were systematically studied. The results of Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, and density gradient column showed that the PAN fibers treated with high temperature...

artykuł

Crustal nature and lithospheric structure of the Okinawa Trough

Gang Wang, Suhua Jiang, Sanzhong Li, Huixuan Zhang, więcej

Geological Journal > 55 > 9 > 6106 - 6122

The Okinawa Trough (OT) is a back‐arc basin located in the eastern edge of the Eurasian Plate. The stage of back‐arc spreading and the exact crustal thickness of the OT are still controversial. To determine the crustal nature and lithospheric structure of the OT, the Moho discontinuity depth of the OT is calculated through the Parker–Oldenburg iterative inversion method based on the Bouguer gravity...

artykuł

The effects of chemical reaction on the microstructure and mechanical properties of polyacrylonitrile (PAN) precursor fibers

Yuan Ge, Zhongyu Fu, Yunjiao Deng, Mingyao Zhang, więcej

Journal of Materials Science > 2019 > 54 > 19 > 12592- 12604

In this study, the effect of chemical structural transformation on the microstructure and mechanical properties of polyacrylonitrile precursor fibers in thermal oxidative stabilization (TOS) process was investigated. The chemical transformation was tracked quantitatively by combining the curve-fitting and second-derivative operations in Fourier transform infrared spectroscopy spectra. The aggregation...

artykuł

Effects of the molecular structure on the vibration reduction and properties of hyperbranched waterborne polyurethane–acrylate for damping coatings

Qiuxue Zhang, Yunjiao Deng, Zhongyu Fu, Huixuan Zhang

Journal of Applied Polymer Science > 136 > 28 > n/a - n/a

A series of hyperbranched waterborne polyurethane–acrylate (HWPUA) hybrid emulsions were prepared with isocyanate‐terminated PU prepolymers, hyperbranched polyol (HP), and acrylate monomers. The HP as crosslinker was synthesized with isophorone diisocyanate, dimethylol propionic acid, and diethanol amine. The influence of the HP content on the chemical structure, particle size, morphology, damping...

artykuł

The surface modification of diatomite, thermal, and mechanical properties of poly(vinyl chloride)/diatomite composites

Guangfeng Wu, Siyu Ma, Yu Bai, Huixuan Zhang

Journal of Vinyl and Additive Technology > 25 > s2 > E39 - E47

Pristine diatomite was first purified by acid treatment and then modified with γ‐methacryloxy propyl trimethoxysilane molecule (KH570) to introduce hydrophobic chains on the surface of acid‐treated diatomite. Fourier‐transform infrared spectroscopy and thermogravimetric analysis (TGA) indicated that the silane coupling agent (KH570) was successfully grafted on the diatomite through covalent bonding...

artykuł

Construction of CuS/TiO2 nano-tube arrays photoelectrode and its enhanced visible light photoelectrocatalytic decomposition and mechanism of penicillin G

Qiuling Ma, Huixuan Zhang, Ruonan Guo, Bo Li, więcej

Electrochimica Acta > 2018 > 283 > C > 1154-1162

In this present work, a CuS/TiO₂ nano-tube arrays photoelectrode employed in environment purification was successfully prepared by an anodization process, with galvanostatic electrodeposition strategy as following method. Meanwhile, morphologies and chemical structures of the resulting photoelectrodes were studied by series of measurements. The results indicated that CuS nanoparticles were successfully...

artykuł

Effect of fabricating parameters on photoelectrocatalytic performance of CeO2/TiO2 nanotube arrays photoelectrode

Xiaoyong Deng, Huixuan Zhang, Ruonan Guo, Yuqi Cui, więcej

Separation and Purification Technology > 2018 > 193 > C > 264-273

In the study, CeO₂ nanoparticles were successfully decorated on the TiO₂ nanotube arrays (CeO₂/TiO₂ NTAs) photoelectrode by cathodic electrodeposition method in the presence of Ce(NO₃)₃ electrolyte. The effect of fabricating parameters including electrolyte concentration, applied voltage, deposition time and calcination temperature on morphology and crystal structure of CeO₂/TiO₂ NTAs was further...

artykuł

Microwave assisted construction of Ag-AgBr/reduced TiO2 nano-tube arrays photoelectrode and its enhanced visible light photocatalytic performance for degradation of 4-chlorphenol

Qingfeng Cheng, Xiaoyong Deng, Huixuan Zhang, Ruonan Guo, więcej

Separation and Purification Technology > 2018 > 193 > C > 255-263

There is an increasingly significant issue on decomposition of contaminants in modern chemical industry and environmental protection. Hence, in the study, to improve the catalytic of semiconductor materials, the silver-silver bromide nanoparticles decorated reduced TiO₂ nano-tube arrays photoelectrode (Ag-AgBr/r-TiO₂ NTAs), which exhibits better photocatalytic (PC) performance in the wide range of...

artykuł

Effect of Ti3+ on enhancing photocatalytic and photoelectrochemical properties of TiO2 nanorods/nanosheets photoelectrode

Xiaoyong Deng, Huixuan Zhang, Ruonan Guo, Qiuling Ma, więcej

Separation and Purification Technology > 2018 > 192 > C > 329-339

In the study, visible-light active Ti³⁺ doped TiO₂ nanorods/nanosheets (Ti³⁺/TiO₂ NRs/NSs) photoelectrode was successfully fabricated by hydrothermal reaction, followed by sodium borohydride reduction treatment. Moreover, physicochemical properties of the resulting samples were studied by series of techniques. Also, photocatalytic (PC) activity of Ti³⁺/TiO₂ NRs/NSs photoelectrode was measured by degradation...

artykuł

Fabrication of Cu2O/TiO2 nano-tube arrays photoelectrode and its enhanced photoelectrocatalytic performance for degradation of 2,4,6-trichlorophenol

Qiuling Ma, Huixuan Zhang, Yuqi Cui, Xiaoyong Deng, więcej

Journal of Industrial and Engineering Chemistry > 2018 > 57 > C > 181-187

Cu₂O decorated TiO₂ nano-tube arrays (Cu₂O/TiO₂ NTAs) photoelectrode was fabricated through electrodeposition strategy. Meanwhile, physicochemical properties of the resulting photoelectrode were systematically studied by series of measurements. Results indicated that Cu₂O/TiO₂ NTAs photoelectrode performed a significantly enhanced light absorbance in the visible region between 400 and 800nm, transient...

artykuł

Synthesis of silver phosphate/graphene oxide composite and its enhanced visible light photocatalytic mechanism and degradation pathways of tetrabromobisphenol A

Xinyi Zhang, Huixuan Zhang, Yanying Xiang, Sibei Hao, więcej

Journal of Hazardous Materials > 2018 > 342 > C > 353-363

In the present study, silver phosphate/graphene oxide (Ag₃PO₄/GO) composite was synthesized by ultrasound-precipitation processes. Afterwards, physicochemical properties of the resulting samples were studied through scanning electron microscope, transmission electron microscope, X-ray diffraction, N₂ adsorption/desorption, UV–vis diffuse reflectance spectroscopy, Raman spectroscopy, X-ray photoelectron...

artykuł

Fabrication of MnO2/TiO2 nano-tube arrays photoelectrode and its enhanced visible light photoelectrocatalytic performance and mechanism

Qiuling Ma, Haitao Wang, Huixuan Zhang, Xiuwen Cheng, więcej

Separation and Purification Technology > 2017 > 189 > C > 193-203

OH) which played an important role in the PEC system. Noticeably, the MnO₂/TiO₂ NTAs photoelectrodes made in the optimized conditions exhibited much higher PEC activity toward MO degradation with the efficiency up to 95.2% within 1h when external potential (+2.0V) was applied. More importantly, these novel MnO₂/TiO₂ NTAs photoelectrodes proved to have excellent stability and reusability that would...

artykuł

Comprehensive and quantitative study on the thermal oxidative stabilization reactions in poly(acrylonitrile‐co‐itaconic acid) copolymer

Zhongyu Fu, Baijun Liu, Bing Li, Yuyao Liu, więcej

Journal of Applied Polymer Science > 135 > 9 > n/a - n/a

Thermal oxidative stabilization (TOS) reactions, mainly cyclization, oxygen uptake, dehydrogenation, crosslinking, and disproportionation termination of cyclization in poly(acrylonitrile‐co‐itaconic acid) (PAI), are tracked quantitatively by the combination of second‐derivative and cure‐fitting operations in the Fourier transform infrared spectroscopy spectra (FTIR) range of 1800–1000 cm⁻¹ and 2300–2100...

artykuł

Study on the multiple cyclization reactions and the formed structures in poly(acrylonitrile‐co‐itaconic acid) copolymers during thermal treatment

Zhongyu Fu, Baijun Liu, Lihao Sun, Yunjiao Deng, więcej

Polymers for Advanced Technologies > 28 > 12 > 1662 - 1669

The present work provided some in‐depth understanding on the role of itaconic acid (IA) in the structural evolution of poly(acrylonitrile‐co‐itaconic acid) (PAI) polymers and the formed cyclic structures during thermal treatment. As the increasing content of IA, the cyclization initiated by the ionic mechanism increased with the less β‐amino nitrile formed and the higher extent of cyclization. The...

artykuł

A novel strategy to fabricate plasmonic Ag/AgBr nano-particle and its enhanced visible photocatalytic performance and mechanism for degradation of acetaminophen

Qiuling Ma, Huixuan Zhang, Ruonan Guo, Yuqi Cui, więcej

Journal of the Taiwan Institute of Chemical Engineers > 2017 > 80 > C > 176-183

In the present work, plasmonic Ag/AgBr nano-particle was fabricated by solution reduction strategy. Meanwhile, physicochemical properties of the resulting samples were investigated by series of techniques. Results showed that Ag/AgBr nano-particle exhibited intense light absorbance in the whole visible region, high photoinduced charge separation efficiency and visible light driven PC performance....

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