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Effect of PEG additives on properties and morphologies of polyetherimide membranes prepared by phase

Jian CHEN, Jiding LI, Xia ZHAN, Xiaolong HAN, Cuixian CHEN,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3,   Pages 300-306 doi: 10.1007/s11705-009-0280-8

Abstract: This study investigated the effect of poly(ethylene glycol) (PEG) additive as a pore-former on the structureThe membranes were prepared by using polyetherimide/-methyl-2-pyrrolidone/PEG (PEI/NMP/PEG) casting solutionThe resulting membranes, prepared by changing the ratio of PEG to PEI, were characterized by scanningAs expected, PEG with a fixed molecular weight (PEG 600) acted as a pore forming agent, and membraneporosity increased as the PEG content of the casting solution increased.

Keywords： permeation     ethylene     filtration     PEI/NMP/PEG     membrane    

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Grafting of PEG400 onto the surface of LLDPE/SMA film

CHEN Gufeng, ZHANG Yi, XU Jiarui, ZHU Yafei

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 2,   Pages 128-131 doi: 10.1007/s11705-007-0024-6

Abstract: The blending films were then immersed in poly(ethylene glycol)400 (PEG400) at room temperature.Results show that PEG400 can be grafted onto the surface of the films via esterification with SMA.The immersion of PEG promotes the enrichment of SMA onto the surface of the films.The water contact angle data show that grafting of PEG400 onto PE can greatly improve the hydrophilicityshow that surface functionalization of polyethylene films by blending SMA and then surface grafting of PEG

Keywords： hydrophilicity     temperature     effective     immersion     reflection accessory    

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Thin-film composite forward osmosis membranes with substrate layer composed of polysulfone blended with PEGor polysulfone grafted PEG methyl ether methacrylate

Baicang Liu,Chen Chen,Pingju Zhao,Tong Li,Caihong Liu,Qingyuan Wang,Yongsheng Chen,John Crittenden

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 4,   Pages 562-574 doi: 10.1007/s11705-016-1588-9

Abstract: additives on the performance of polysulfone (PSf) based FO membranes: one is poly(ethylene glycol) (PEG), and another is PSf grafted with PEG methyl ether methacrylate (PSf-g-PEGMA).PSf blended with PEG or PSf-g-PEGMA was used to form a substrate layer, and then polyamide was formedWith the increase of PEG content from 0 to 15 wt-%, FO water flux declined by 23.4% to 59.3% compared

Keywords： thin-film composite     forward osmosis     amphiphilic copolymer     interfacial polymerization     poly(ethylene glycol)    

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Synthesis and characterization of macromolecular surface modifier PP--PEG for polypropylene

CHEN Hanjia, SHI Xuhua, ZHU Yafei, ZHANG Yi, XU Jiarui

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 102-108 doi: 10.1007/s11705-008-0018-z

Abstract: A novel macromolecular surface modifier, polypropylene-grafted-poly(ethylene glycol) copolymer (PP--PEGresults indicated that the graft reactions were hindered by increasing the molecular weight of PP or PEGdegradation temperature and lower crystallization capacity as compared with pure PP, and the side chain of PEGThe thermal stability of PP--PEG decreased with the increasing content or molecular weight of PEG.The results of attenuated total reflectance FTIR spectroscopy (ATR-FTIR) showed that PP--PEG could diffuse

Keywords： polypropylene     crystallization capacity     attenuated     hydrophilicity     reflectance    

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Preparation and properties of gel membrane containing porous PVDF-HFP matrix and cross-linked PEG for

ZHANG Mei, CUI Zhenyu, ZHU Baoku, HAN Gaige, XU Youyi, ZHANG Aiqing

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 89-94 doi: 10.1007/s11705-008-0011-6

Abstract: based on porous poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix and cross-linked PEG

Keywords： ethylene     PEGDA     inversion     network     initiator    

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Effect of incorporating Elaeagnus angustifolia extract in PCL-PEG-PCL nanofibers for bone tissue engineering

Vahideh R. Hokmabad, Soodabeh Davaran, Marziyeh Aghazadeh, Effat Alizadeh, Roya Salehi, Ali Ramazani

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 1,   Pages 108-119 doi: 10.1007/s11705-018-1742-7

Abstract: poly(ϵ-caprolactone)-poly(ethylene glycol)-poly(ϵ-caprolactone) (PCL-PEG-PCLThe response of human cells to the PCL-PEG-PCL/EA nanofibers was evaluated using human dental pulp stemhad better adhesion and proliferation capacity on the EA loaded nanofibers than on the pristine PCL-PEG-PCLThese results suggest that PCL-PEG-PCL/EA nanofibers might have potential applications for bone tissue

Keywords： Elaeagnus angustifolia     scaffold     electrospinning     human dental pulp stem cell     tissue engineering    

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Control on self-assembly structures of rod-coil-rod (PANI)-(PEG)-(PANI) triblock copolymer

YANG Zhifang, WU Jingao, YANG Yingkui, ZHOU Xingping, XIE Xiaolin

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 85-88 doi: 10.1007/s11705-008-0003-6

Abstract: The self-assembly behaviors of the rod-coil-rod (PANI)-(PEG)-(PANI) triblock copolymer are investigatedin different solvents, such as -methyl-2-pyrrolidone (NMP), dimethyl formamide (DMF), ethanol and water

Keywords： different     multi-layer     mono-layer     dimethyl formamide     concentration    

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Hydrogen production by catalytic gasification of cellulose in supercritical water

GUAN Yu, PEI Aixia, GUO Liejin

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 2,   Pages 176-180 doi: 10.1007/s11705-008-0026-z

Abstract: Cellulose, one of the important components of biomass, was gasified in supercritical water to produce hydrogen-rich gas in an autoclave which was operated batch-wise under high-pressure. KCO and Ca(OH) were selected as the catalysts (or promoters). The temperature was kept between 450°C and 500°C while pressure was maintained at 24–26 MPa. The reaction time was 20 min. Experimental results showed that the two catalysts had good catalytic effect and optimum amounts were observed for each catalyst. When 0.2 g KCO was added, the hydrogen yield could reach 9.456 molkg which was two times of the H amount produced without catalyst. When 1.6 g Ca(OH) was added, the H yield was 8.265 molkg which is lower than that obtained using KCO as catalyst but is still 1.7 times that achieved without catalyst. Comparing with the results obtained using KCO or Ca(OH) alone, the use of a combination of KCO and Ca(OH) could increase the H yield by up to 2.5 times that without catalyst and 25% and 45% more than that obtained using KCO and Ca(OH) alone, respectively. It was found that methane was the dominant product at relatively low temperature. When the temperature was increased, the methane reacts with water and is converted to hydrogen and carbon dioxide.

Keywords： reaction     temperature     combination     catalytic effect     dominant product    

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A visual graphic approach for mobility analysis of parallel mechanisms

Xu PEI, Jingjun YU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 1,   Pages 92-95 doi: 10.1007/s11465-011-0213-3

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A compound load simulator based on zero-torsion parallel mechanisms

Jingjun YU, Wei LI, Xu PEI, Shusheng BI, Guanghua ZONG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1,   Pages 1-4 doi: 10.1007/s11465-012-0306-7

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CFD simulation of jet behaviors in a binary gas-solid fluidized bed: comparisons with experiments

Pei PEI, Guiying WU, Bangting YU, Kai ZHANG, Jianchun JIANG, Dongsheng WEN,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3,   Pages 242-249 doi: 10.1007/s11705-009-0277-3

Abstract: Based on the experimental observation of the fluidization characteristics of solid mixtures (resin and rapeseed) with different densities and sizes, the jet behaviours of the binary system are simulated in a two-dimensional jetting fluidized bed 0.30 m in width and 2.00 m in height. A simple mathematical model, by introducing two additional force terms in both gas and particle phase momentum equations of Gidaspow’s inviscid two-fluid model, is used to explore the effects of jet gas velocity and mixture combination on the jet penetration depth in the fluidized bed with a binary system. Experimental results show that there is a fluidization velocity interval (-) for the resin-on-rapeseed (flotsam-on-jetsam) segregated bed. The simulated jet penetration depth increases with the increase of jet gas velocity and the volume fraction of the flotsam (resin), which is in fair agreement with experimental data. The above findings show that the hydrodynamic model of Brandani and Zhang (2006), by introducing the average physical properties from Goossens et al.(1971), can be used to predict the jet behaviors of a well-mixing binary system.

Keywords： mathematical     two-dimensional     flotsam-on-jetsam     fluidization velocity     physical    

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Performance analysis of an air-source heat pump using an immersed water condenser

Jie JI, Huide FU, Hanfeng HE, Gang PEI,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 234-245 doi: 10.1007/s11708-009-0056-3

Abstract: A distributed model of an air-source heat pump (ASHP) system and its experimental setup using an immersed water condenser were presented. Dynamic performance of the ASHP was then evaluated by both simulation and experiment. The results indicated that the system coefficient of performance (COP) decreased as the condenser temperature increased, ranging from 4.41 to 2.32 with the average COP equaling 3.29 during the experiment. Comparisons between simulation results and experimental measurements demonstrated that the model was able to yield satisfactory predictions. Furthermore, temperature profiles of the refrigerant in the evaporator and condenser were also given. This paper provides the theoretical and experimental background for ASHP system optimization and a valuable reference for a solar air-source heat pump water heater when the solar irradiation energy is insufficient on cloudy or rainy days.

Keywords： air-source     heat pump     distributed model     immersed water condenser    

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Polyethylene glycol-supported ionic liquid as a highly efficient catalyst for the synthesis of propylene carbonate under mild conditions

Rui YAO, Hua WANG, Jinyu HAN

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 3,   Pages 239-245 doi: 10.1007/s11705-012-1297-y

Abstract: propylene carbonate (PC) was promoted by an ionic liquid (IL) covalently bound to polyethylene glycol (PEG

Keywords： ionic liquid     PEG-supported ionic liquid     carbon dioxide     propylene carbonate    

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Chemical characteristics of fine particulate matter emitted from commercial cooking

Bing PEI,Hongyang CUI,Huan LIU,Naiqiang YAN

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 3,   Pages 559-568 doi: 10.1007/s11783-016-0829-y

Abstract: The chemical characteristics of fine particulate matter (PM ) emitted from commercial cooking were explored in this study. Three typical commercial restaurants in Shanghai, i.e., a Shanghai-style one (SHS), a Sichuan-style one (SCS) and an Italian-style one (ITS), were selected to conduct PM sampling. Particulate organic matter (POM) was found to be the predominant contributor to cooking-related PM mass in all the tested restaurants, with a proportion of 69.1% to 77.1%. Specifically, 80 trace organic compounds were identified and quantified by gas chromatography/mass spectrometry (GC/MS), which accounted for 3.8%–6.5% of the total PM mass. Among the quantified organic compounds, unsaturated fatty acids had the highest concentration, followed by saturated fatty acids. Comparatively, the impacts of other kinds of organic compounds were much smaller. Oleic acid was the most abundant single species in both SCS and ITS. However, in the case of SHS, linoleic acid was the richest one. ITS produced a much larger mass fraction of most organic species in POM than the two Chinese cooking styles except for monosaccharide anhydrides and sterols. The results of this study could be utilized to explore the contribution of cooking emissions to PM pollution and to develop the emission inventory of PM from cooking, which could then help the policy-makers design efficient treatment measures and control strategies on cooking emissions in the future.

Keywords： commercial cooking     PM2.5     chemical characteristics     organic matter    

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Effect of inhibiting tyrosine kinase Src expression on protein phosphatase 2A and tau phosphorylation

LIU Rong, ZENG Ji, ZHOU Xinwen, WANG Jianzhi, PEI Jinjing

Frontiers of Medicine 2008, Volume 2, Issue 3,   Pages 235-238 doi: 10.1007/s11684-008-0044-8

Abstract: The aim of this study is to investigate the effect of tyrosine kinase Src on Tyrosine 307(Y307) phosphorylation, protein phosphatase 2A (PP2A) activity, and on tau phosphorylation. Specific Src siRNA was transfected into cultured mouse neuroblastoma N2a cells to inhibit the expression of Src protein, and the phosphorylation levels of PP2A Y307 and tau at different sites, as well as PP2A activity were detected at different time points after siRNA transfection. Twelve hours after siRNA transfection, the protein level of Src was dramatically decreased, with decreased PP2A Y307 phosphorylation. However, the total PP2A protein level was also decreased, together with a decreased PP2A activity. Tau was hyperphosphorylated at the Ser198/199/202 sites. Multiple factors may be involved in the cellular regulation of PP2A activity. Inhibiting Src expression could induce inactivation of PP2A and tau hyperphosphorylation.

Keywords： hyperphosphorylation     PP2A activity     cellular regulation     siRNA     siRNA transfection    

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Title Author Date Type Operation

Effect of PEG additives on properties and morphologies of polyetherimide membranes prepared by phase

Jian CHEN, Jiding LI, Xia ZHAN, Xiaolong HAN, Cuixian CHEN,

Journal Article

Grafting of PEG400 onto the surface of LLDPE/SMA film

CHEN Gufeng, ZHANG Yi, XU Jiarui, ZHU Yafei

Journal Article

Thin-film composite forward osmosis membranes with substrate layer composed of polysulfone blended with PEGor polysulfone grafted PEG methyl ether methacrylate

Baicang Liu,Chen Chen,Pingju Zhao,Tong Li,Caihong Liu,Qingyuan Wang,Yongsheng Chen,John Crittenden

Journal Article

Synthesis and characterization of macromolecular surface modifier PP--PEG for polypropylene

CHEN Hanjia, SHI Xuhua, ZHU Yafei, ZHANG Yi, XU Jiarui

Journal Article

Preparation and properties of gel membrane containing porous PVDF-HFP matrix and cross-linked PEG for

ZHANG Mei, CUI Zhenyu, ZHU Baoku, HAN Gaige, XU Youyi, ZHANG Aiqing

Journal Article

Effect of incorporating Elaeagnus angustifolia extract in PCL-PEG-PCL nanofibers for bone tissue engineering

Vahideh R. Hokmabad, Soodabeh Davaran, Marziyeh Aghazadeh, Effat Alizadeh, Roya Salehi, Ali Ramazani

Journal Article

Control on self-assembly structures of rod-coil-rod (PANI)-(PEG)-(PANI) triblock copolymer

YANG Zhifang, WU Jingao, YANG Yingkui, ZHOU Xingping, XIE Xiaolin

Journal Article

Hydrogen production by catalytic gasification of cellulose in supercritical water

GUAN Yu, PEI Aixia, GUO Liejin

Journal Article

A visual graphic approach for mobility analysis of parallel mechanisms

Xu PEI, Jingjun YU

Journal Article

A compound load simulator based on zero-torsion parallel mechanisms

Jingjun YU, Wei LI, Xu PEI, Shusheng BI, Guanghua ZONG

Journal Article

CFD simulation of jet behaviors in a binary gas-solid fluidized bed: comparisons with experiments

Pei PEI, Guiying WU, Bangting YU, Kai ZHANG, Jianchun JIANG, Dongsheng WEN,

Journal Article

Performance analysis of an air-source heat pump using an immersed water condenser

Jie JI, Huide FU, Hanfeng HE, Gang PEI,

Journal Article

Polyethylene glycol-supported ionic liquid as a highly efficient catalyst for the synthesis of propylene carbonate under mild conditions

Rui YAO, Hua WANG, Jinyu HAN

Journal Article

Chemical characteristics of fine particulate matter emitted from commercial cooking

Bing PEI,Hongyang CUI,Huan LIU,Naiqiang YAN

Journal Article

Effect of inhibiting tyrosine kinase Src expression on protein phosphatase 2A and tau phosphorylation

LIU Rong, ZENG Ji, ZHOU Xinwen, WANG Jianzhi, PEI Jinjing

Journal Article