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rheological properties and viscosity reduction of South China Sea crude oil

Journal of Energy Chemistry 2018年第4期27卷 1198-1207页

作者： Hui Sun Xingxing Lei Benxian Shen Huiran Zhang Jichang Liu Gengnan Li Di Wu Petroleum Processing Research Center East China University of Science and TechnologyShanghai 200237China The Cene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State UniversityPullmanWA 99163United States Department of Chemistry Washington State UniversityPullmanWA 99163United States Materials Science and Engineering Washington State UniversityPullmanWA 99163United States

The rheological properties of South China Sea （SCS） crude oil were studied. A group of synthetic long-chain polymers, including octadecyl acrylate-maleic anhydride bidodecyl amide copolymer （VR-D）, octadecyl acrylate-maleic anhydride bioctadecyl amide copolymer （VR-O） and octadecyl acrylate-maleic anhydride phenly amide copolymer （VR-A）, were employed to serve as viscosity reducers （VRs）. Their performance was evaluated by both experimental and computational methodologies. The results suggest that the SCS crude oil has low wax content yet high resin and asphaltene contents, which lead to high viscosity through formation of association structures. Additionally, the SCS crude oil appears to be a pseudoplastic fluid showing linear shear stress-shear rate dependence at low temperature. Interestingly, it gradually evolves into a Newtonian fluid with exponential relationship between shear stress and shear rate at higher temperature. Synthetic VRs demonstrate desirable and effective performance on improvement of the rheological properties of SCS crude oil. Upon the introduction of 1000ppm VR-O, which is synthesized by using octadecylamine in the aminolysis reaction, the viscosity of SCS crude oil is decreased by 44.2% at 15 ℃ and 40.2% at 40℃. The computational study suggests significant energy level increase and shear stress decrease for VR-containing crude oil systems.

关键词： South China Sea crude oil Characterization rheological properties Viscosity reduction

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rheological properties OF WHEAT GLIADINS IN AQUEOUS PROPANOL

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Chinese Journal of Polymer Science 2013年第5期31卷 809-814页

作者： Shao-min Sun 宋义虎 Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

rheological properties of wheat gliadins in 50% （V/F） aqueous propanol were carried out as a function of gliadin concentration c and temperature. The solutions at 20 g L-1 to 200 g L-1 behave as Newtonian fluids with an flow activation energy of 23.5-27.3 kJ mol-1. Intrinsic viscosity [η] and Huggins constant kH are determined according to Huggins plot at c 〈 120 g L-1. The results reveal that gliadins are not spherical shaped and the molecular size tends to increase with temperature due to improved solvation.

关键词： Gliadin Solution rheological properties Intrinsic viscosity.

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rheological properties of Konjac Glucomannan/SiO_2/Organic-Borate Gels

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Journal of Wuhan University of Technology(Materials Science) 2009年第4期24卷 575-580页

作者：吴力立张超灿 Department of Polymer Materials and Engineering School of Material Sciences and EngineeringWuhan University of Technology

A series of thermoreversible konjac glucomannan gels crosslinked by organic borate were prepared. Required amount of hydrophilic SiO2 was added into the konjac glucomannan solutions before the crosslinking reaction, The gel network was formed through the crosslinking reaction between borate ions dissociated from organic borate and the cis-diol hydroxyl groups on the mannose units of polysaccharide chains. The rheological properties of the complex gels were studied by dynamic viscoelastic measurement. The gelation kinetics of the complex gels was studied and the critical getation points of the gels were exactly determined by the Winter-Chambon criterion. The effects of temperature and composite ratio on the shear storage modulus （G＇）, the loss modulus （G＂） and the sol-gel transition points were investigated.

关键词： konjac glucomannan Si02 organic borate rheological properties

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rheological properties and Incipient Motion of Cohesive Sediment in the Haine Estuary of China

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China Ocean Engineering 2002年第4期17卷 483-498页

作者：白玉川 NG Chiu-on 沈涣庭王尚毅 Institute for Sedimentation on River and Coast Engineering Tianjin UniversityTianjin300072China Department of Mechanical Engineering The University of Hong KongHong KongChina The State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China

The Haihe cohesive sediment, which is typical in China, is studied systematically for its basic physical and incipient motion properties. Following the requirements of dredging works in the Haihe Estuary, cohesive sediment samples were taken from three locations. Laboratory experiments were conducted to determine the rheological properties of these samples and to examine the incipient motion of the cohesive sediment. It is found that the cohesive sediment has an obvious yield stress tau(b), which increases with the mud density in a manner of an exponential function, and so does the viscosity parameter eta. The cohesive sediment behaves like a Bingham fluid when its density is below 1.38 similar to 1.40 g/cm(3), and when denser than these values, it may become a power-law fluid. The incipient motion experiment also revealed that the incipient velocity of the cohesive sediment increases with die density in an exponential manner. Therefore, the incipient motion is primarily related to the density, which is different from the case for non-cohesive sediment in which the incipient motion is con-elated with the diameter of sand particles instead. The incipient motion occurs in two different ways depending on the concentration of mud in the bottom. For sufficiently fine particles and a concentration lower than 1.20 g/cm(3), the cohesive sediment appears as fluidized mud, and the incipient motion is in the form of instability of an internal wave. For a higher concentration, the cohesive sediment appears as general quasi-solid-mud, and the incipient motion can be described by a series of extended Shields curves each with a different porosity for newly deposited alluvial mud.

关键词： incipient motion rheological properties cohesive sediment estuary and coast

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Thermal behavior and rheological properties of PANI-DBSA/PAN Blends

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Journal of Wuhan University of Technology(Materials Science) 2007年第1期22卷 153-155页

作者：潘玮 Department of Material and Chemical Engineering Zhongyuan Institute of Technology

Conducting blends of polyacrylonitrile （PAN） copolymer and dodecylbenzene sulfonic acid doped polyaniline （PANI-DBSA） were prepared by solution blending of the two components. By means of various characterization methods including differential scanning calorimetry （DSC）, thermogravimetric analysis （TGA）, transmission electron microscopy （TEM） and cone-plate rheometry, the effects of PANI-DBSA content on the thermal behavior, morphological and rheological properties of the blends were investigated. A single and composition-dependent /＇g was found for each of all blends and the thermal stability of PANI-DBSA/PAN was superior to that of both pure Co-PAN and PANI- DBSA. rheological results show that the apparent viscosity of blend solution decreased at low PANI- DBSA content （2.5 wt%） while increased at high PANI-DBSA content （7.5wt%-10 wt%）. Moreover, the shear-thinning appeared more distinctly with the incorporation of PANI-DBSA into the blend solutions especially at a high shear rate.

关键词： polyaniline polyacrylonitrile blend thermal behavior rheological properties

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rheological properties of Conductive Asphalt Binders Containing Graphite and Carbon Fiber Before and After Ageing

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 557-559页

作者：孙长军 TANG Ning PAN Pan 吴少鹏 State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Caofeidian Development Investment Group Co. LTD

Modified asphalt binders were prepared by adding conductive materials, graphite and carbon fiber. The rotation thin film oven test （RTFOT） and pressure age vessel test （PAV） were conducted to simulate the binder aging in the field. rheological properties of graphite and carbon fiber modified asphalt binder were investigated by the empirically rheological properties （penetration and softening point） and the dynamic shear rheometer （DSR） test. Results show that physical properties of asphalt binder change with conductive material mixed. DSR tests present that the values of complex modulus increase while phase angles decrease under a proper amount of graphite and carbon fiber. Rutting parameters point out that graphite can improve the rutting resistance of asphalts. rheological parameters can be used to assess aging.

关键词： graphite carbon fiber rheological properties aging

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rheological properties and microscopic mechanism of waste cooking oil activated waste crumb rubber modified asphalt

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Journal of Road Engineering 2022年第4期2卷 357-368页

作者： Xinjun Feng Hui Liang Zijian Dai School of Traffic&Transportation Engineering Changsha University of Science&TechnologyChangsha 410114China

In this paper,the surface activated crumb rubber with waste cooking oil(WCO)was studied to improve the performance of crumb rubber modified *** activated waste crumb rubber modified asphalt(OCRMA)with different amount of crumb rubber was prepared to study the microscopic appearance of OCRMA by scanning electron microscope and fluorescence microscope and analyze the surface *** rheological properties and microscopic mechanism of OCRMA were characterized by dynamic shear rheological test,multiple stress creep recovery(MSCR)test,BBR test and infrared *** results show that the dissolution degree of waste crumb rubber is improved after WCO activation,and the compatibility with asphalt components is enhanced,and the stable cross-linking structure is formed,which improves the asphalt *** several new absorption peaks,which were obvious,were all caused by the composition of WCO,that is,there was no significant chemical change during the interaction between the activated crumb rubber and base *** with the common waste crumb rubber modified asphalt(CRMA),activation with WCO can significantly reduce the viscosity of CRMA,decrease the difference of segregation softening point by 27%,and enhance the low temperature performance by 30%.The aging degree is greatly reduced,and the anti-aging performance of OCRMA is increased by about 20%with the same *** high temperature performance,though higher than that of base asphalt,decreases to some *** comprehensive analysis,the optimal dosage of crumb rubber for OCRMA is 30%.

关键词： Waste crumb rubber Waste cooking oil Surface activated crumb rubber rheological properties Microcosmic mechanism

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rheological properties of flaxseed meal and soybean protein isolate blend by extrusion

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International Journal of Agricultural and Biological Engineering 2017年第4期10卷 224-233页

作者： Li Siqin Wu Min Zhao Donglin Liu Yi Sun Yang Li Dong College of Engineering China Agricultural UniversityBeijing 100083China Chinese Academy of Agricultural Mechanization Sciences Beijing 100083China

The rheological properties of flaxseed meal(FM)and Soybean Protein Isolate(SPI)extruded by the two-screw extruder under different processing conditions were ***,temperature,screw speed and SPI concentration were the four major factors for the extrusion *** rheological properties of extruded products were calculated by steady state flow test,frequency sweep test and creep *** the samples showed shear-thinning effect that is to say their apparent viscosities decreased with the increases of shear *** data fitted well to Power Law *** was found that both the storage(G′)and loss modulus increased as the rise in the angular frequency(w),which also fitted well to Power Law *** creep-recovery behavior of the samples fitted well to Burger’s *** addition,the temperature had no significant effect on the creep recovery rate of the samples.

关键词： flaxseed meal(FM) soybean protein isolate(SPI) extrusion rheological properties

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rheological properties OF POLY(VINYLIDENE FLUORIDE) IN MOLTEN STATE

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Chinese Journal of Polymer Science 2008年第5期26卷 639-644页

作者：沈烈 Department of Polymer Science and Engineering Zhejiang Universityand Key Laboratory of Macromolecular Synthesis and FunctionalizationMinistry of EducationHangzhou 310027China

The theological behavior of poly(vinylidene fluoride)(PVDF)samples of different molecular weights was investigated by means of high pressure capillary rheometer and rotational *** on the rheological properties of such materials above melt temperatures is of interest as this can lead to an improved understanding of polymer behavior in processing and fabrication *** factors derived from time-temperature superposition showed good fit to the Arrhenius equation with a flow activa...

关键词： Poly(vinylidene fluoride) rheological properties Flow activation energy Plateau modulus.

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rheological properties of Soy Protein Isolate and Polyurethane in the PAN/DMSO Solution

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Journal of Donghua University(English Edition) 2009年第4期26卷 339-343页

作者：肖茹尹端顾利霞 State Key Lab for Modification of Chemical Fibers and Polymer Materials College of Material Science and EngineeringDonghua University

The rheological properties of soy protein isolate （SPI） and polyurethane （PU） in the PAN/DMSO solution were investigated in this study. The results showed that all these solutions possessed pseudo-plastic solution properties. There are opposite effects of SPI and PU in the PAN/DMSO solution. Their apparent viscosity, degree of non-Newtonian fluid, and extent of structuralization of blend system increase with the addition of SPI, whereas, all of these decrease with the addition of PU. Moreover, the theological properties of PAN/DMSO solution were affected when SPI and PU were added equally, and SPI presented more effect when the proportion of ingredient was less, and PU presented more effect when the proportion of ingredient was more.

关键词： rheological properties soy protein isolate polyurethane polyacrylonitrile dirneth ylsulfoxide

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