POLYMER
·
2020
·
IF 4.231
Wei-Guang Chen,Nan Hu,Yu Chen,Hong Pan
Multifunctional branched polylactides (BPLAs) with N,N -bis(2-hydroxyethyl)glycine (BHEG) as branching units were prepared. The as-prepared BPLAs had degree of branching in the range of 5.7–9.1%, number-average molecular weight in the range of 7.4 kDa–9.3 kDa, and dispersity in the range of 1.3–1.7. The tertiary amine groups of BHEG units endowed BPLAs intrinsic photoluminescence (PL) nature with quantum yield (QY) in the range of 1.2–2.0% under the maximum excitation wavelength of 360–370 nm and the maximum emission wavelength of 439–445 nm. Oxidized BPLAs showed the maximum excitation wavelength of ca. 473 nm as well as the maximum emission wavelength of ca. 540 nm, and much higher QYs of 9.1–10.5%. The tertiary amine groups of BHEG units also endowed BPLAs guest-encapsulation capacity. The obtained BPLAs were effective multifunctional additives for poly( l -lactide) plastics, embodied with improved crystallization and mechanical properties , PL property and new functions through hosting functional guest molecules.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2019
·Vol. 28
·期 11
·957-967
·
IF 1.707
Yang Xiaoli,Wang Kunyan,Yan Lei,Yu QiNing,Xia Hongxia,Liu Yanbo,Yan Chengjun
Multi-stimuli-responsive hydrogels are being increasingly studied due to their sensitive response to small stimuli and wide applications in biosensors and drug delivery. In this study, a multi-stimuli-responsive hydrogel, poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone- co -methacrylic acid- co - N -isopropylacryl amide) [poly(HEMA- co -NVP- co -MAA- co -NIPA)], was synthesized by radical polymerization and characterized by Fourier transform infrared (FTIR) and 13 C NMR spectroscopy techniques. With the aids of scanning electron microscopy (SEM) characterization, it was confirmed that the sensitive stimuli-responsive behavior of the hydrogel stemmed from its microstructure variation with those external stimulus. Rheological study showed that the hydrogel had rheological feature of typical elastomer. Compression tests revealed that the poly(hydroxyethyl methacrylate- co - N -vinyl pyrrolidone) [poly(HEMA- co -NVP)] played an important role in enhancing the compressive modulus of such hydrogel. More interestingly, the equilibrium swelling ratio (ESR) studies further confirmed that the composite hydrogel displayed response sensitively to the stimulus of temperature, pH, and ionic strength. Herein, theophylline as a drug model was adopted due to the multi-stimulus properties of hydrogels, which were a potential candidate for drug loading and delivering. Releasing drug continuously in a given period was dependent on the characteristics of solution and loading time. The mechanisms for drug release from the hydrogels were studied by Ritger–Peppas model.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xinkuai He,Zhousi Hu,Jingjing Yang,Ruqing Guo,Luye Wu
The co-deposition behavior of Co(II) and Mo(VI) in N,N-dimethylformamide and ethylene glycol system is observed. The result implies that Co–Mo co-deposition is typical induced deposition, while containing ordinary deposition process . Mo(VI) species in the system can suppress the reduction of Co(II) and its effect can be improved as the increase of Mo(VI) concentration, however, Co(II) species can promote the reduction of Mo(VI) and the effect can also be improved as the increase of Co(II) concentration. SEM micrographs indicate that all these films exhibit a fibrous surface morphology with a new fluffy microstructure. XRD pattern reveals that the Co–Mo film is a Mo solid solution in Co and its average size of crystalline grain is 9.5 nm. In addition, the electrocatalytic activity for hydrogen evolution reaction (HER) on these Co–Mo films is investigated. These results indicate that its electrocatalytic activity can be improved as Mo content increases from 1.02 to 2.84 wt% and the prepared Co–Mo film with 2.84 wt% Mo presents a high electrocatalytic activity and stability for HER with an overpotential of 81 mV at 10 mA cm −2 .
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Fan Yang,Qinqin Zhang,Hua Xin,Tianzhao Wu,Zhigang Zhang
Separating the mixture of the target product n-propyl acetate (NPAC) and the unreacted reactant n-propanol (NPA) is necessary during the production of NPAC. NPA and NPAC cannot be separated by simple distillation because the two could form an azeotrope under atmospheric pressure. Liquid–liquid extraction is an energy-saving and environment-friendly method for separating azeotropic mixtures. Ionic liquids (ILs) are promising alternatives to conventional extractants for separating azeotropes due to the advantages of designability and negligible vapor pressure. In this study, the liquid–liquid equilibrium (LLE) data for the ternary systems of NPAC + NPA + 1-butyl-3-methylimidazolium dihydrogen phosphate ([BMIM][H2PO4]) or 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) or 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) were determined at 303.15 K and 101.3 kPa. The accuracy of the experimental LLE data was checked by the Bachman, Hand, and Othmer–Tobias equations. The selectivity and partition coefficient were calculated to evaluate the extraction capability of the selected extractants. The experimental LLE data were correlated with the nonrandom two-liquid model, and the binary interaction parameters were regressed. Finally, the separation mechanism of the three ILs was explored through σ-profile analysis.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 135
·期 6
·3363-3373
·
IF 2.209
Zhang Shijie,Zhang Jiaoqiang,Kou Kaichang,Jia Qian,Xu Yunlong,Zerraza Sofiane,Liu Ning,Hu Rongzu
2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexazisowurtzitane (HNIW)·1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) co-crystal in a 2:1 molar ratio was prepared by a solvent/non-solvent method, and the co-crystal has been characterized by several methods. The enthalpies of dissolution of 2HNIW·HMX co-crystal in N,N -dimethylformamide at different temperatures were measured by a DC08-1 Calvet microcalorimeter under standard atmospheric pressure, and it is indicated that the dissolutions are exothermic process. The empirical formulae for the calculation of the molar enthalpy ( \(\Delta_{\text{diss}} H\) ) of dissolution, relative partial molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{partial}}\) ), relative apparent molar enthalpy ( \(\Delta_{\text{diss}} H_{\text{apparent}}\) ), and enthalpy of dilution ( \(\Delta_{\text{dil}} H_{1,2}\) ) at 298.15 K are obtained. The differential enthalpies ( \(\Delta_{\text{dif}} H\) ) and kinetic equations describing the dissolution process at different temperatures are deduced. Furthermore, the apparent activation energy E = 10.54 ± 0.22 kJ mol -1 and pre-exponential constant A = 0.34 ± 0.03 s −1 of 2HNIW·HMX co-crystal are obtained. The standard molar Gibbs free energy of activation ( \(\Delta G_{ \ne }^{\theta }\) ) at different temperatures is 86.44 ± 0.02 kJ mol −1 (298.15 K), 88.02 ± 0.03 kJ mol −1 (303.15 K), 89.61 ± 0.01 kJ mol −1 (308.15 K), 91.18 ± 0.01 kJ mol −1 (313.15 K), and 92.75 ± 0.02 kJ mol −1 (318.15 K), respectively. The standard molar entropy of activation ( \(\Delta S_{ \ne }^{\theta }\) ) and standard molar enthalpy of activation ( \(\Delta H_{ \ne }^{\theta }\) ) are − 262.55 ± 0.72 J mol −1 K −1 and 7.98 ± 0.22 kJ mol −1 , respectively.
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ECOTOXICOLOGY
·
2024
·
IF 2.4
Yang Liu,Liu Kexin,Shi Lina,Chen Ming,Liu Junyan,Dai Shiniu,Xi Yilong,Wen Xinli
N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD) and Zn 2+ , extensively used in the tire manufacturing process, are frequently detected in freshwater environments. However, the intergenerational effects of isolated 6PPD exposure and joint 6PPD and Zn 2+ exposure at concentrations approximating environmental levels remain unknown. This study assessed the chronic toxicity and intergenerational effects of 6PPD (0.02–20 μg/L) and a mixture of 6PPD and Zn 2+ (5 μg/L) over three generations in Daphnia magna bioassays. In the F0 generation, a dose-dependent decline in total offspring number was observed with 6PPD exposure alone, while co-exposure with Zn 2+ exacerbated the reproductive toxicity of 6PPD. Across three generations, low-dose (0.02 µg/L) 6PPD alone and combined with Zn 2+ induced a cumulative degenerative maternal effect. Conversely, high-dose (20 µg/L) 6PPD, both independently and in combination with Zn 2+ , exhibited an adaptive maternal effect. Notably, the grandmaternal effect emerged exclusively in the co-exposure group treated with 20 μg/L 6PPD and 5 μg/L Zn 2+ , with no such effect in the group exposed to 20 μg/L 6PPD alone, suggesting that Zn 2+ may enhance the potential toxicity of 6PPD. Overall, this study provides novel insight into the intergenerational impacts of environmentally relevant levels of 6PPD alone and in combination with a heavy metal, elucidating the environmental risks posed by tire-derived chemicals through their synergistic effects on transgenerational toxicity.
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PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Tao Jia,Shengshan Bi,Jiangtao Wu
Compressed liquid densities of n -decane + n -dodecane binary mixtures were measured with a vibrating-tube densimeter at temperatures from (283–363) K and pressures from (0.1–100) MPa over the whole range of composition . The binary mixtures n -decane (1) + n -dodecane (2) were prepared at mole fractions of ( x 1 = 0, 0.2297, 0.4436, 0.6433 0.7841, and 1.0), respectively. The experimental densities of binary mixtures were successfully correlated with the Tait-type equation, and the absolute average percentage deviations of the experimental and calculated values were 0.048%, 0.055%, 0.059%, 0.058%, 0.068%, and 0.052%, respectively. In addition, the excess molar volume was calculated for whole range of temperature, pressure and composition.
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高影响因子
PLoS One
·
2014
·Vol. 9
·期 10
·e110155
·
IF 3.534
Zhihu Yan,Caili Dai,Haishun Feng,Yifei Liu,Shilu Wang
The viscoelastic properties of worm-like micelles formed by mixing the cationic surfactant N -hexadecyl- N -methylpiperidinium bromide (C 16 MDB) with the anionic surfactant sodium laurate (SL) in aqueous solutions were investigated using rheological measurements. The effects of sodium laurate and temperature on the worm-like micelles and the mechanism of the observed shear thinning phenomenon and pseudoplastic behavior were systematically investigated. Additionally, cryogenic transmission electron microscopy images further ascertained existence of entangled worm-like micelles.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siying Chen,Linfeng He,Jing Zou,Shiyi Yang,Lingxin Chen,Yingna Hou,Dongmei Xu,Zhongda Yan,Sheng Li,Jianying Wu
Peracetic acid (PAA) has garnered considerable interest due to its exceptional disinfection properties and strong oxidizing capabilities. However, the coexistent hydrogen peroxide (H 2 O 2 ) in the PAA solution, which has similar chemical characteristics with PAA, makes accurate measurement of PAA concentration challenging. In this study, a rapid, sensitive, and reliable spectrophotometric method for determining PAA was developed. The method involves the oxidation of N , N -diethyl- p -phenylenediamine (DPD) by Co(II)-catalyzed PAA, resulting in the formation of a stable pink DPD radical (DPD ●+ ). It is worth noting that Co(Ⅱ) is an excellent PAA catalyst but is inactive with H 2 O 2 . Consequently, there is minimal interference from the coexistent H 2 O 2 in the determination of PAA. The absorbance of DPD ●+ at 551 nm was well linear (R 2 > 0.999) with concentrations of PAA in the range of 0–80 μM under optimized reaction conditions, and the limit of detection was determined to be low as 0.175 μM. Furthermore, the proposed Co(II)-DPD spectrophotometric method demonstrates strong resistance to common natural water constituents (ferric ions, sulphate ions, nitrate ions, chloride ions, bicarbonate ions, and humic acid) and is suitable for the accurate determination of PAA in natural water sources like groundwater and surface water. Additionally, the proposed Co(II)-DPD spectrophotometric method was dependable for quantifying PAA concentrations and monitoring PAA changes in Co(II)/PAA, Cu(II)/PAA, Fe(II)/PAA, and hydroxylamine/Fe(II)/PAA processes. In conclusion, the proposed Co(II)-DPD spectrophotometric method can be utilized as an alternative method for the rapid and accurate determination of PAA in water.
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Neuropsychiatric Disease and Treatment
·
2022
·
IF 2.989
Yuxi Jia,Ping Li,Fei Wu,Fanjie Zeng,Beilin Zhang,Jinpeng Wang
Background: In clinic, valproic acid (VPA) has been widely used in the treatments of epilepsy and is currently under clinical trials for the treatments of multiple diseases. However, gravidas receiving VPA treatment during their early stage of pregnancy were reported to be associated with elevated incidences of autism in their child. In this study, the potential influences of n-3/n-6 polyunsaturated fatty acids (PUFAs) as supplements were investigated in VPA-induced autistic rat model.Materials and Methods: A rat model of autism spectrum disorder (ASD) was established by VPA exposure at the E12.5 day of gestation. Neonatal male Wistar rats (n = 24) were divided into VPA group, A group and B group, while normal neonatal male Wistar rats served as controls. At P21 days, animals in the control and VPA groups were fed with standard chow, while rats in the A group were fed with n-3 PUFA free chow, and those in the B group with n-3/n-6 PUFA (1:5) chow. The duration of the diet was from P21 days to 3 months. All rats were subjected to the examinations of repetitive stereotyped behaviors and changes in social interaction at the end of supplement. The neuroinflammation in the brain and serum was also evaluated. Hematoxylin–eosin (HE) staining and Nissl staining were used to observe the neuronal injury in hippocampus.Results: In the B group, the repetitive stereotyped behaviors reduced, the social communication was improved, the neuronal loss and proinflammatory cytokines in the hippocampus reduced, and the extracellular STAT3 activation was inhibited in the hippocampus, as compared to the B group.Conclusion: Supplements with n-3/n-6 PUFA (1:5) rescues repetitive stereotyped behaviors and social deficits in neonatal rats exposed to VPA, likely due to the improved inflammatory responses through the alteration of STAT3 signaling. This study provides evidence for the use of n-3/n-6 PUF in the treatment of autism in humans.
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高影响因子
TETRAHEDRON
·
2017
·
IF 2.651
Qiujie Tang,Ping Xie,Jin Wang,Jiajun Lin,Chunlai Feng,Charles U. Pittman,Aihua Zhou
Two cascade coupling reactions were developed between N -alkyl(aryl)- N -methacryloyl benzamides and readily available benzyl alcohols or sodium benzenesulfinates . Through a radical cyclization strategy, these one-pot sequential reactions provided two simple and efficient approaches to the synthesis of a variety of isoquinoline-1,3(2H,4H)-dione derivatives in high yields with a broad substrate scope. These compounds are valuable molecules in drug discovery .
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 43
·e04409
·
IF 2
Jialong Yang,Guangqun Zhai
The effect of aerobic dioxygen (O 2 ) residues and hydrogen peroxide (H 2 O 2 ) on dithiobenzoate-mediated reversible addition-fragmentation chain transfer (RAFT) polymerization of methyl methacrylate (MMA) was studied. 2-cyano-2-propyl dithiobenzoate (CPDB) displayed excellent thermally oxidative stability against O 2 in O 2 -rarefied dimethylsulfoxide (DMSO) but was readily oxidized by H 2 O 2 . Azo-initiated CPDB-mediated RAFT polymerization of MMA in DMSO under different media led to multi-component products, consisting of PMMA macro-CTAs, MMA-terminated oligomers and low-MW byproducts, while nitrogen deoxygenating and headspace eliminating gave rise to a comparable CTA efficiency, higher than that headspace limiting. H 2 O 2 -initiated CPDB-mediated headspace-free RAFT polymerization of MMA smoothly proceeded in DMSO even at 50 °C, suggesting the co-initiation by CPDB, and also formed predominant PMMA macro-CTAs, negligible oligomers and some low-MW byproducts. H 2 O 2 -initiated CPDB-mediated headspace-free RAFT polymerization of MMA at 70 °C displayed well-controlled behaviors with 2–5 wt.% byproducts, and the high fidelity of the PMMA macro-CTAs was confirmed by the chain extension via azo-initiated RAFT polymerization and Cu I -catalyzed concurrent ATRP/RAFT polymerization. Graphical AIBN-initiated dithiobenzoate-mediated RAFT polymerization of MMA in O 2 -rarefied DMSO under headspace-free media led to well-controlled behaviors comparable to that under N 2 deoxygenating. H 2 O 2 -initiated RAFT polymerization manifested the unprecedented acceleration by dithiobenzoate; ascribed to its oxidation by H 2 O 2 ; and well-controlled polymerization behaviors.
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危险品化学品经营许可证（带存储）