JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 11
·
IF 1.768
Ye Yuan,Shaokun Song,Sufen Deng,Qin Wang,Qisong Feng,Chuanxi Xiong,Lijie Dong
Exploration of new functionalization approaches to inert rigid fiber, activation inert surface, and enhancing interface adhesion is urgently required for fiber-based multiphase materials. In this paper, we developed a simple yet efficient method towards active functionalized poly( p -phenylene terephthalamide) fiber through mussel-adhesive, self-polymerization, and successive dipping–drying procedure based on as-designed detachable equipment. In comparison with current acid etching and high energy radiation methods, the active functional strategy achieves scatheless functional modification to inert rigid fiber. Attribute to π–π conjugation effect, the new active nanolayers integrate rigid fiber and polymer matrix into homogeneous-like structure. Consequently, the functionalized fiber-based composites exhibit great mechanical property and desirable field-responsive ability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43018.
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POLYMER COMPOSITES
·
2014
·Vol. 36
·期 8
·1531-1540
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IF 1.455
Xiang-Ming Hu,Yan-Yun Zhao,Wei-Min Cheng
Six types of phenolic foaming resins were synthesized at room temperature with different formaldehyde/phenol (F/P) ratios in this study. The effects of F/P ratios on physicochemical characteristics and foaming properties of the resulting resins were analyzed based on viscosity, solids content, hydroxymethyl index, residual monomer content, molecular structure of the foaming resin, flame retardancy, and foam compression strength measurements. The results of the present study indicated that viscosity and solids content of the foaming resins increased with an increase in F/P; the hydroxymethyl index of the resin first increased and then decreased with an increase in F/P, reaching its maximum at F/P = 1.6; the trimer, tetramer, and pentamer contents of the resins increased with an increase in F/P. Nuclear magnetic resonance ( 13 C NMR) spectral analysis indicated that the presence of para / para -methylene, para -hydroxymethyl, and ortho -hydroxymethyl groups in the resin gradually increased with an increase in F/P; the proportions of ortho/ortho - and ortho / para -methylene bonds of the resin increased as F/P was increased. The increase in F/P was demonstrated to be conducive to improving the compression strength, thermal stability, and flame retardancy of the phenolic foam and reducing its peak heat release rate and total smoke release. The morphology of phenolic foams show that the closed cell content in the PF foam increases with the F/P ratio until it reaches a ratio of 1.6. Furthermore, the cell size becomes more uniform. POLYM. COMPOS., 36:1531–1540, 2015. © 2014 Society of Plastics Engineers
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Journal of Physical Chemistry C
·
2015
·
IF 4.772
Weiyuan Yao,Yue Liu,Xiaoqiang Wang,Xiaole Weng,Haiqiang Wang,Zhongbiao Wu
In this paper, a sol–gel made Ce–O–P catalyst (referred to as Ce–O–P-SG) was employed for selective catalytic reduction (SCR) of NOx with NH3, which was directly compared with two other Ce–O–P samples as synthesized via hydrothermal and coprecipitation routes (referred to as Ce–O–P-HT and Ce–O–P-CP, respectively). Experimental results revealed that the Ce–O–P-SG catalyst yielded a more than 90% NO conversion at 200 °C in the presence of 10 vol % H2O, whereas Ce–O–P-HT and Ce–O–P-CP catalysts only showed 50% and 20% NO conversions under the same conditions, respectively. After subjected to a series of characterization technologies (e.g., XRD, BET-BJH, XPS, NH3-TPD, py-IR, and H2-TPR), it was found that more enriched surface Ce(4+) species were formed except for the two main CePO4 phases (monazite and rhabdophane phases) of the Ce–O–P-SG catalyst compared to the other two samples, resulting in the increase of surficial active oxygen ions content. This could lead to an enhancement in surface acidity and redox capacity of the Ce–O–P-SG catalyst, effectively promoting the NH3–SCR activity of the catalyst. Further analyses on SO2 and H2O tolerance revealed that the Ce–O–P-SG possessed a higher sulfur resistance than the other two samples, which could be attributed to the SO2 trapping effect by the abundant active oxygen species over Ce–O–P-SG catalyst.
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POLYMER COMPOSITES
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2014
·Vol. 36
·期 11
·2076-2083
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IF 1.455
Huihui Xu,Jidi Cui,Chunyue Pan,Guipeng Yu,Shiyu Hong,Xipeng Wang,Zhijiang Yao
Polymer blends and composite films were facilely prepared from their aqueous solutions with varying contents of poly(3,4-ethylenedioxythiophene) (PEDOT), polyethylene oxide (PEO), and polyacrylic acid (PAA). The physicochemical and electric properties of the composite films were analyzed by Raman spectra, infrared spectra (FT-IR), scanning electronic microscopy (SEM), thermogravimetric analysis (TGA), and four-point probe method. PEDOT was successfully incorporated into each blend which was confirmed by spectra analysis. The crystallization of PAA or PEO and the structure of PEDOT should be taken into consideration for the electronic conductivity. According to Raman spectra, in the case of PEDOT–PAA–PEO, conformation of the PEDOT backbone changed from the quinoid to the benzoid structure partly. The ionic conductivities of lithium-ion salt-mixed PAA–PEO and ternary blend were characterized by AC impedance spectroscopy. The ternary blend with LiCoO 2 presents good electronic and ionic conductivity, and it appears to be a new candidate for polymeric mixed ionic electronic conductor. POLYM. COMPOS., 36:2076–2083, 2015. © 2014 Society of Plastics Engineer
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CLINICA CHIMICA ACTA
·
2014
·
IF 2.764
Ting Yang,Fei Chen,Feifei Xu,Fengliang Wang,Qingqing Xu,Yun Chen
Background P-glycoprotein (P-gp) can efflux drugs from cancer cells , and its overexpression is commonly associated with multi-drug resistance (MDR). Thus, the accurate quantification of P-gp would help predict the response to chemotherapy and for prognosis of breast cancer patients . Methods An advanced liquid chromatography–tandem mass spectrometry (LC/MS/MS)-based targeted proteomics assay was developed and validated for monitoring P-gp levels in breast tissue. Results Tryptic peptide 368IIDNKPSIDSYSK380 was selected as a surrogate analyte for quantification, and immuno-depleted tissue extract was used as a surrogate matrix. Matched pairs of breast tissue samples from 60 patients who were suspected to have drug resistance were subject to analysis. The levels of P-gp were quantified. Using data from normal tissue, we suggested a P-gp reference interval. The experimental values of tumor tissue samples were compared with those obtained from Western blotting and immunohistochemistry (IHC). The result indicated that the targeted proteomics approach was comparable to IHC but provided a lower limit of quantification (LOQ) and could afford more reliable results at low concentrations than the other two methods. Conclusions LC/MS/MS-based targeted proteomics may allow the quantification of P-gp in breast tissue in a more accurate manner.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Jingxin Yang,Ji Li,Wenyi Dong,Jun Ma,Tingting Li,Yi Yang,Jiayin Li,Jia Gu
This study proposed deethylatrazine (DEA) as the OH probe compound during ozonation and compared with the widely used p -chlorobenzoic acid ( p CBA) for the first time. Results showed the ozone decay was not affected by DEA, but largely accelerated by p CBA as compared to the control. The DEA degradation was exclusively attributed to OH formation from ozonation of the tested waters, while p CBA was partially degraded by OH formation from the p CBA-derived propagation reactions. In synthetic waters with different OH scavenging capacities, the ozone decay rates with DEA were almost consistent with the control. The ozone decay rates with p CBA remained consistent with the control only in the synthetic waters with high OH scavenging capacities. For the synthetic waters with low OH scavenging capacities, p CBA led to higher ozone decay rates and OH exposures, and thus gave overestimated R ct values. The two OH probe compounds were also investigated in four authentic waters with different OH scavenging capacities. DEA exhibited no detectable effect on the ozone decay in all four authentic waters as compared to the control. The enhancing effects of p CBA on the ozone decay and OH formation were observed in the tap and reservoir water, which led to an overestimation of R ct as compared to the presence of DEA. In the ground water and wastewater, similar values were observed in ozone decay rates and R ct for the presence of p CBA and DEA. Thus, the use of p CBA as the OH probe compound should be carefully examined or avoided to prevent its interrupts in determining the R ct during ozonation of waters with different OH scavenging capacities. DEA is a more appropriate OH probe compound during ozonation.
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ANALYTICAL BIOCHEMISTRY
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2016
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IF 2.243
Wei Zhang,Min Zhu,Feng Wang,Danhui Cao,Jennifer Jin Ruan,Weike Su,Benfang Helen Ruan
Glutamate dehydrogenase (GDH) catalyzes the oxidative deamination of L-glutamate and is important for several biological processes . For GDH inhibitor screening, we developed a novel mono-sulfonated tetrazolium salt (EZMTT), which can be synthesized using H 2 O 2 oxidation and purified easily on silica gel in large quantities. The EZMTT detection method showed linear dose responses to NAD(P)H, dehydrogenase concentration and cell numbers. In E. coli GDH assay, the EZMTT method showed excellent assay reproducibility with a Z factor of 0.9 and caused no false positives in the presence of antioxidants (such as BME). Using the EZMTT-formazan-NAD(P)H system, we showed that EGCG is a potent E. coli GDH inhibitor (IC 50 45 nM) and identified that Ebselen , a multifunctional thioredoxin reductase inhibitor, inactivated E. coli GDH (IC 50 213 nM). In cell-based assays at 0.5 mM tetrazolium concentration, EZMTT showed essentially no toxicity after a 3-day incubation, whereas 40% of inhibition was observed for WST-8. In conclusion, EZMTT is a novel tetrazolium salt which provides improved features that are suitable for dehydrogenases and real-time cell-based high-throughput screening (HTS).
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ADVANCED POWDER TECHNOLOGY
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2016
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IF 2.478
Bin Chen,Shenwen Fang,Ting Chen,Yan Xiong,Ming Duan
Compound poly(methylmethacrylate (MMA)-acrylic acid (AA)-ethyl acrylate (EA))/Fe 3 O 4 superparamagnetic nanoparticles were synthesized successfully by emulsion polymerization and solvothermal reaction methods. The nanoparticles were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD) and thermogravimetry analysis (TGA). P(MMA-AA-EA)/Fe 3 O 4 nanoparticles exhibited superparamagnetic properties with a saturation magnetization value of 20 emu/g. The selective adsorption behaviors of nanoparticles toward dyes were investigated and the function of electronic interaction during the adsorption process was also discussed.
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Nanoscale
·
2016
·Vol. 8
·期 40
·17516-17523
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IF 7.76
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
Semiconductor-based photocatalytic hydrogen (H2) evolution from water is of great importance for solar-to-chemical conversion processes to boost and promote the future hydrogen economy. Here, for the first time, we demonstrate that p-Cu3P coupled with n-TiO2 forms a novel hybrid structure which accelerates electron–hole pair separation and transfer for improved photocatalytic H2-evolution activity. The rate of H2 evolution of the optimized Cu3P/TiO2 (7940 μmol h−1 g−1) is 11 times higher than that of bare TiO2, with an apparent quantum efficiency (AQE) of 4.6%. This work may provide more insight into the synthesis of novel phosphide-based hybrid materials with high photocatalytic H2-evolution activity and sufficient stability for solar-to-chemical conversion and utilization.
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Scientific Reports
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2016
·Vol. 6
·期 1
·1-5
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IF 5.228
Ling Yun,Xie Wen Chang,Liu Guo Kun,Yan Run Wen,Wu De Yin,Tang Jing
Inter- and intra- molecular hydrogen bonding plays important role in determining molecular structure, physical and chemical properties, which may be easily ignored for molecules with a non-typical hydrogen bonding structure. We demonstrated in this paper that the hydrogen bonding is responsible for the different Raman spectra in solid and solution states of p-Nitrothiophenol (PNTP). The consistence of the theoretical calculation and experiment reveals that the intermolecular hydrogen bonding yields an octatomic ring structure (8) of PNTP in the solid state, confirmed by the characteristic S-H---O stretching vibration mode at 2550 cm −1 ; when it comes to the solution state, the breakage of hydrogen bond of S-H---O induced the S-H stretching vibration at 2590 cm −1 . Our findings may provide a simple and fast method for identifying the intermolecular hydrogen bonding.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
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IF 3.359
Yuan Gao,Zhenhuan Li,Bowen Cheng,Kunmei Su
In this study, Poly(p-phenylene sulfide) (PPS) microporous membrane was prepared via Thermally Induced Phase Separation (TIPS), and the superhydrophilic membrane was modified by nitric acid. After the interfacial reaction between PPS membrane and HNO 3 , a large number of hydrophilic groups, such as SO , SO 2 , C O, NH 2 and NO 2 groups, were introduced onto PPS membrane surface. When the treatment temperature was 50 °C, the characterized results indicated that the membrane became superhydrophilic with contact angle of 0° and pure-water flux of 154.95 L/m 2 h. And the membrane structure was not destroyed during the modification via HNO 3 . Furthermore, the performance of modified membrane on oil/water separation was studied and all of the separation efficiency were greater than 95% when the modified membrane was utilized to separate four different types of oil/water emulsions. In particular, the modified membrane was utilized to separate the chlorobenzene/water emulsion with the separation efficiency of 98.98%. Both carbonic ink solution and 1 wt% chlorobenzene/water emulsion were filtered with the treated membrane with acid/base solution (pH = 1, 7 and 14) to evaluate the modified membrane corrosion resistance of acid/base, and the characterized results indicated that modified membrane possessed the excellent acid/base corrosion resistance.
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RSC Advances
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2017
·Vol. 7
·期 10
·6114-6122
·
IF 3.108
Bingzhi Liu,Huaili Zheng,Xiangrui Deng,Bincheng Xu,Yongjun Sun,Yongzhi Liu,Jianjun Liang
A template assembly method was introduced to obtain a cationic hydrophobic micro-block structure based amphiphilic electrolyte poly(acrylamide-co-2-methacryloxyethyltrimethyl ammonium chloride) P(AM-DMC) in this work, thereby increasing charge density and enhancing charge neutralization ability at the same charge density. The alteration of copolymerization or homo-polymerization was evaluated by the changes in reactivity ratios, so as to unravel the mechanism of template assembly. The micro-blocks generated by the new distribution of sequences were demonstrated by 1H nuclear magnetic resonance spectroscopy (1H NMR) and differential thermal-thermogravimetric analysis (DSC-TGA). Two negative controls were employed in sludge dewatering experiments to further evaluate the advanced properties of the template-assembled polymer. The results further verified that the positive effect of template assembly on flocculation performance of the polymer was achieved mainly through two ways: improving charge density and generating the micro-block structure. It can be concluded that the introduction of template assembly into polymerization can improve the performance of the polymer.
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