Journal of Water Process Engineering
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2015
·
IF 0
Dongfang Zhang,Jiaxun Wang
Liquid-phase photocatalytic oxidation of a secondary diazo dye compound, Congo red (CR, C 32 H 22 N 6 Na 2 O 6 S 2 ) and pharmaceutical phthalylsulfathiazole, was carried out in a cylindrical photochemical reactor on gold-loaded titania systems. The deposition of Au nanoparticles was performed by photochemical deposition methods on the surface of pre-sulphated titania. The detailed structural, compositional and optical characterization and physico-chemical properties of the obtained products are analyzed by X-ray diffraction (XRD), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), high resolution TEM (HRTEM), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), Fourier transformation infrared spectroscopy (FTIR) and photoluminescence spectra (PL) analysis. Notable enhancements in the photocatalytic activity of TiO 2 were achieved by deposition of gold onto titania, which can be attributed to the enhanced surface electron excitation and effective electron-hole separation on gold-deposited TiO 2 nanoparticles. The present study shows that the higher rate of photodegradation observed on Au-TiO 2 at pH 6.5 can be correlated to the ratios of the concentrations of the ionized to the neutral dye molecules and also to the higher concentration of hydroxylated surface, which are able to effectively scavenge photogenerated valence band holes. Accumulation of the holes in the semiconductor particles increases the probability of formation of excited oxygen atom which is a reactive species readily oxidizing the organic dye molecule or environmental pollutant such as pharmaceutical phthalylsulfathiazole. The reaction mechanism of the photocatalytic system was detected by a photoluminescence method using terephthalic acid as a probe molecule.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 129
·期 1
·187-192
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IF 1.289
Chao Yang,Zhen-Guo Yang
A novel photosensitive low viscosity epoxy resin was synthesized by polyethylene glycol (PEG)-modified bisphenol-A epoxy resin (E51). The resin was modified by ethylene glycol, diethylene glycol, and different molecule weights (200,300,400) PEGs to optimize the minimum viscosity. FTIR was used to determine molecule structure. Cationic photoinitiator (UVI-6976) mixed with modified resin (10 wt %), was utilized to boost the resin curing under UV light. The curing degree was beyond 90% within 40 s and the whole process was monitored by photo-DSC. The modified resin diluted with ethylene glycol diglycidyl ether, was screen printed onto polyimide and polyethylene terephthalate substrate, and the properties of solder mask were up to China printed circuit association standard. The solder resist also meet all requirements under ink-jet printing technology as the viscosity is under 60 mPa·s and the curing duration is <1 min. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 114
·94351-94360
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IF 3.84
Rina Sa,Yan Yan,Lei Wang,Yuan Li,Liqun Zhang,Nanying Ning,Wencai Wang,Ming Tian
In this research, ultraviolet (UV) irradiation induced graft polymerization of glycidyl methacrylate (GMA) was performed to modify the surface properties of poly-p-phenyleneterephthamide (PPTA) fibers. The improvement of adhesion with a rubber matrix was achieved due to the introduction of epoxy groups. The successful grafting of GMA on the PPTA fiber surface was ascertained by characterization using X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and scanning electron microscopy (SEM). The tensile properties of PPTA fibers after each stage of surface modification were determined by tensile testing of single-filaments. A single-fiber pull-out test was applied to evaluate the adhesion of PPTA fibers with the rubber matrix. The pull-out force of grafted PPTA fibers exceeded that of the pristine fibers by 53.7%. Resorcinol–formaldehyde–latex (RFL) dipping was applied to further improve the adhesion properties. As a result, the fibers with GMA grafting followed by RFL dipping exhibited a 80.8% improvement compared with the pristine fibers and achieved much higher adhesion strength with rubber matrix, compared to the PPTA fibers modified with conventional industrial method of isocyanate (NCO) and RFL two bath dipping.
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高影响因子
FIBERS AND POLYMERS
·
2014
·Vol. 15
·期 2
·281-285
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IF 1.113
Li Chaorong,Xie Yong,Liu Qiuyan,Zheng Yingying,Zhang Xiaobo,Dong Wenjun
We report a simple and effective route to fabricate branched hierarchical flower-like nanostructures of ZnO on natural cotton cellulose fiber by combining electrospinning and the low-temperature hydrothermal growth technique. First, natural cotton cellulose nanofibers were prepared by electrospinning cotton cellulose /LiCl/DMAc solution. The electrospun cotton cellulose nanofibers served as flexible substrate, on which the branched, highly uniform, and dense flower-like ZnO were hydrothermally grown. The as-prepared cotton cellulose/ZnO nanocomposite fibers were characterized by SEM, HRTEM, EDS, TG, and UV-vis spectrophotometry. The modified cotton cellulose nanocomposite fibers were not only exhibiting dispersed uniformly, but also rendered excellent protection against UV radiation because of the incorporation of flower-like ZnO nanostructures. Therefore, the as-prepared nanocomposite fibers demonstrate a significant performance in ultraviolet protection and provide a potential application for ultraviolet detection.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
·
IF 4.097
Fen-Ying Kong,Ting-Ting Chen,Jing-Yi Wang,Hai-Lin Fang,Da-He Fan,Wei Wang
Tetrapods-like titanium nitride–reduced graphene oxide (TiN–rGO) nanohybrids were synthesized by ultraviolet (UV) irradiation method for the first time. With the aid of UV light , the photogenerated electrons in TiN were transfered into GO which was then reduced to form rGO, so the TiN–rGO nanohybrids were obtained. The TiN–rGO nanohybrids were characterized by UV–vis spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results showed that GO could be effectively converted to rGO, and TiN–rGO nanohybrids were successfully prepared. In addition, the application of TiN–rGO nanohybrids were investigated by modified electrode , it demonstrated good performance in sensing of chloramphenicol (CAP) because of the synergic effect between tetrapods-like TiN and rGO. This idea appeared to be a very effective and simple strategy to prepare excellent TiN–rGO nanohybrid materials with promising potential in wider analytical applications including electrochemical analysis , biosensors, fuel cells and supercapacitors
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 70
·57067-57075
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IF 3.84
Fanzhe Bu,Chengji Zhao,Baolong Wang,Na Zhang,Hao Lu,Zhenzhen Cai,Yurong Zhang,Hui Na
A novel cross-linking strategy for imidazolium-functionalized poly(arylene ether ketone) containing tetramethyl groups, used as anion exchange membranes, is presented in this paper. The preparation of anion exchange membranes comprised of converting benzylic methyl to bromomethyl groups by a radical reaction, quaternization of the bromometylated poly(arylene ether ketone) with 1-vinylimidazole and subsequent anion exchange reaction. The photo-crosslinking reaction, induced by UV-light under the activation of a photo-initiator, was simple and controllable compared to the conventional cross-linking process via a multifunctional cross-linking agent. All the vinylimidazolium-founctionalized poly(arylene ether ketone) membranes showed good mechanical and thermal stabilities. Moreover, the cross-linked membranes exhibited better dimensional stabilities. The ionic conductivity of cross-linked membranes was still acceptable although that property decreased with UV irradiation time due to the compact cross-linked structure. For example, the VImPAEK-15 min-HCO3 membrane with irradiation time of 15 min showed a moderate bicarbonate anion conductivity of 0.021 S cm−1 and a low swelling ratio of 10.74% at 70 °C. The alkaline stability test under both high and relatively low alkaline conditions was carried out. Although the vinylimidazolium cation is unstable in strong alkaline solution, the cross-linked vinylimidazolium-based membranes are chemically stable in the bicarbonate anion form under relatively low alkaline conditions. The results showed that the cross-linked membrane induced by UV irradiation could be used for electrochemical devices that were operated at less extreme pHs.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 13
·
IF 1.768
Xiaoqing Dong,Weizhen Shen,Peng Hu,Zhiquan Li,Ren Liu,Xiaoya Liu
The narrow emission spectra of light emitting diodides (LED) as irradiation source has brought great challenge for the development of efficient photoinitiators sensitive to LED light. This paper described a series of novel unimolecular type II photoinitiators, containing thioxanthones as chromophores and benzodioxoles as coinitiators. The structures of the photoinitiators were characterized by 1 H NMR, 13 C NMR and high-resolution mass spectrometer. Study on the photophysical properties of the photoinitiators indicated that electron donors/acceptors as spacers between thioxanthone and benzodioxole affected both the UV–Vis absorption and the fluorescence emission. The long wavelength absorptions from 385 nm to 402 nm as well as low fluorescence quantum yields make the investigated benzodioxole derivatives quite attractive as efficient photoinitiators under UV-A and visible LED light irradiation. With a proper molecular design, the unimolecular photoinitiator exhibited higher initiation efficiency than the thioxanthone derivatives from the literature. Possible initiation mechanism was also proposed based on the photolysis study. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43239.
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 82
·66807-66814
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IF 3.84
Bin Zhou,Youfa Wang,Donglin Xia
Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ were successfully synthesized via the thermal decomposition of trifluoroacetate precursors using oleic acid and octadecylene as coordinating solvents. The up-conversion optical properties of the β-KYF4 nanocrystals with different lanthanide (Ln)-doped ions (Yb3+/Er3+, Yb3+/Tm3+) were investigated. It is found that the colloidal dispersion of β-KYF4:Yb,Er/Tm nanocrystals display strong multiple up-conversion emission spanning from the deep UV-to-NIR regions under 980 nm excitation. Pure β-KYF4 nanocrystals codoped with Er3+/Yb3+ and Tm3+/Yb3+ can emit bright blue, green, yellow, and red emissions visible to the naked eye by adjusting the concentrations of Yb3+ sensitizer ion and Er3+ or Tm3+ activator ions. Moreover, the UC luminescent colors can be tuned for the four colors from blue to green to yellow and finally to red emission in the β-KYF4:X%Yb3+/(0.2%–2%)Er3+ and β-KYF4:25%Yb3+/0.2%Tm3+ colloidal samples. This work substantially expands our understanding of this category of KYF4 upconversion nanocrystals.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 3
·45698
·
IF 1.86
Hongjie Liu,Wenchao Lu,Shaojie Liu
In recent years, more and more attention has been paid to bio-based materials due to their sustainability and environmental friendliness. The combination of biomass and ultraviolet (UV) curing technology can reduce the dependence on petroleum products and emissions of volatile organic compounds. In this article, a new environment-friendly UV-curable coating with good performances was successfully prepared from acrylated soybean oil (ACSO). ACSO was obtained at low temperature without catalyst and inhibitor by reacting soybean oil-based polyol with acryloyl chloride and characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. It was found that the UV-curable oligomer of ACSO had lower viscosity and better ductility, compared to acrylated epoxidized soybean oil (AESO). The properties of UV-cured films prepared by ACSO were studied and compared with films from AESO. The results showed that the ACSO-based films were significantly improved in the adhesion and impact resistance. Furthermore, the addition of styrene could enhance the hardness and impact resistance of films. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45698.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 41
·34364-34375
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IF 3.289
Jianquan Tan,Weiqu Liu,Zhengfang Wang
A series of waterborne UV-curable comb-shaped (meth)acrylate graft copolymers containing long fluorinated and/or siloxane side chains were synthesized by conventional radical copolymerization of a novel mono-methacryloyloxy terminated fluorinated macromonomer (PHFA-GMA) and/or polysiloxane macromonomer (SiOHMAC) with (meth)acrylate monomers. The separate effects of PHFA-GMA and SiOHMAC, as well as the synergic effect of these two components, on the properties, especially the surface properties were investigated in detail. A hydrophobic surface could be obtained with extremely low content of PHFA-GMA and/or SiOHMAC due to the strong tendency of the macromonomers to migrate towards the outmost layer, resulting in abundant enrichment of fluorine and silicon atoms on the surface. XPS (X-ray photoelectron spectroscopy) results revealed that for a given weight of the two macromonomers, Si atomic concentration of the copolymer modified by SiOHMAC is higher than F atomic concentration of the copolymer modified by PHFA-GMA. AFM (atomic force microscopy) images showed that surface of the copolymer modified by SiOHMAC is rougher than that modified by PHFA-GMA. Compared to PHFA-GMA, SiOHMAC had higher efficiency and effectiveness in creating hydrophobic surfaces. In addition, the influence of PHFA-GMA and/or SiOHMAC on the physical properties, such as water dispersion particle size, water absorption, pencil hardness, adhesion, mechanical properties and thermal properties were also investigated. The novel comb-shaped copolymers prepared via conventional radical polymerization not only had excellent properties but also have potential applications in large scale industrialization.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 41
·34288-34296
·
IF 3.289
Hao Zhang,Jun Zhang,Rongping Yun,Zhiguo Jiang,Haimei Liu,Dongpeng Yan
The construction of high-performance polymer–clay nanocomposites plays an important role in developing new types of organic–inorganic hybrids. In this work, a series of polymer–clay nanocomposites were prepared based on polyurethane (PU) and chemical grafting of γ-aminopropyltriethoxysilane (APS) onto dodecyl sulfonate (DS) intercalated MgAl layered double hydroxide (APS–DS–LDH). The detailed morphology, damping properties, mechanical behavior, thermal stability as well as ultraviolet absorption ability of the PU/LDH nanocomposites were studied systematically. Results reveal that the addition of APS grafted DS/LDH nanoparticles can enhance the damping properties and the thermal decomposition temperature, compared with the pristine PU. A mechanical test shows that the flexibility of the nanocomposites is significantly improved by the incorporation of APS–DS–LDH, especially for the LDH content of 3%. Meanwhile, ultraviolet absorption intensity also increases by 33%. It is expected that the PU/APS–DS–LDH nanocomposites can be used as structural damping materials and elastomers in practical applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 5
·4528-4533
·
IF 3.277
Wan Li,Xiaoping Zeng,Hong Wang,Qin Wang,Yajiang Yang
Glutathione–Ag (GSH–Ag) supramolecular hydrogels have almost no mechanical strength, and the disassembly of GSH–Ag complexes occurs very easily under UV irradiation. In this work, low molecular weight polyvinyl alcohol (PVA) was used to reinforce GSH–Ag gels. The phase transition temperature of GSH–Ag gels can be increased from 45 to 60 °C in the presence of only 0.8 wt% of PVA. Rheological studies indicated that the storage modulus of reinforced GSH–Ag gels was 6 times higher than that of unreinforced gels. SEM studies revealed that the macromolecular chains of PVA are intertwined with the GSH–Ag aggregates, leading to an increase of mechanical strength. The TEM studies and UV-vis spectra indicated that Ag+ within the GSH–Ag gels was in situ reduced to form Ag nanoparticles under UV irradiation. Meanwhile, gradual disassembly of GSH–Ag hydrogels can be induced through controlling the time of UV irradiation. Based on this feature, the controllable release of a loaded model drug (crystal violet) and Ag species can be realized from the reinforced GSH–Ag gels. The release media show a good inhibition effect on E. coli.
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高影响因子
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