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Journal articles on the topic 'Rheological behavior of the polymer'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Al-Shakry, Badar, Tormod Skauge, Behruz Shaker Shiran, and Arne Skauge. "Polymer Injectivity: Investigation of Mechanical Degradation of Enhanced Oil Recovery Polymers Using In-Situ Rheology." Energies 12, no. 1 (2018): 49. http://dx.doi.org/10.3390/en12010049.

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Water soluble polymers have attracted increasing interest in enhanced oil recovery (EOR) processes, especially polymer flooding. Despite the fact that the flow of polymer in porous medium has been a research subject for many decades with numerous publications, there are still some research areas that need progress. The prediction of polymer injectivity remains elusive. Polymers with similar shear viscosity might have different in-situ rheological behaviors and may be exposed to different degrees of mechanical degradation. Hence, determining polymer in-situ rheological behavior is of great sign

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2

Arrigo, Rossella, and Giulio Malucelli. "Rheological Behavior of Polymer/Carbon Nanotube Composites: An Overview." Materials 13, no. 12 (2020): 2771. http://dx.doi.org/10.3390/ma13122771.

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This paper reviews the current achievements regarding the rheological behavior of polymer-based nanocomposites containing carbon nanotubes (CNTs). These systems have been the subject of a very large number of scientific investigations in the last decades, due to the outstanding characteristics of CNTs that have allowed the formulation of nanostructured polymer-based materials with superior properties. However, the exploitation of the theoretical nanocomposite properties is strictly dependent on the complete dispersion of CNTs within the host matrix and on the consequent development of a huge i

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3

Barmar, M., and B. Kaffashi. "Rheological Behavior of HEUR Mixtures in Aqueous Media." International Polymer Processing 22, no. 2 (2007): 146–50. http://dx.doi.org/10.1515/ipp-2007-0004.

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Abstract Three S-G HEUR thickeners were synthesized by a step growth polymerization technique of poly (ethylene oxide) (PEO) and dicyclohexylmethane – 4,40-diisocyanate (H12MDI) and then end capped with two monofunctional aliphatic alcohols. These polymers were mixed together according to the hydrophilic and hydrophobic nature of their segments. Based on this, two sets of associating polymers were introduced. In one set, the samples had identical hydrophobic segments while in the other one, hydrophilic segments were similar. The steady shear viscosity profiles of aqueous solutions of all model

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4

Korchagin, V. I., L. N. Studenikina, and M. V. Schelkunova. "Rheological behavior of binary polymer compositions." Plasticheskie massy, no. 9-10 (November 2, 2019): 52–55. http://dx.doi.org/10.35164/0554-2901-2019-9-10-52-55.

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The article presents the results of a study of the rheological behavior of binary composites based on serial polyethylene grade LDPE 15803-020 with different content of microcellulose grade Filtracell, in a wide range of temperatures and shear rates during deformation through a capillary diameter of 1 mm and a length of 5 and 30 mm. Stable flow regime is manifested in the temperature range from 160 to 200°C for composites containing microcellulose in an amount of 30 wt.%, and its partial replacement with spent microcellulose (waste production of vegetable oils) can reduce the effective viscosi

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Cho, Chaehyun, and Jun Mo Kim. "Scaling Relationships of the Structural and Rheological Behavior of Tadpole Polymer Chains in Dilute Solution Systems Using Brownian Dynamics Simulations." Polymers 16, no. 20 (2024): 2871. http://dx.doi.org/10.3390/polym16202871.

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Tadpole polymers, also known as lasso polymers, feature molecular structures that combine a single ring with a single linear side branch, leading to distinct conformational, dynamical, and rheological characteristics compared to their corresponding counterparts, particularly pure linear and pure ring polymers. To elucidate the mechanisms underlying these distinctive behaviors, comprehensive mesoscopic Brownian dynamics (BD) simulations of dilute solution systems of tadpole polymers were conducted using a bead–rod chain model under both equilibrium and flow conditions. Three types of tadpole po

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6

Telin, A. G., T. I. Zainetdinov, and M. E. Khlebnikov. "Study of the rheological properties of the water-swelling polyacrylamide grade FS 305 for development technologies of waterproofing works at oil wells." Proceedings of the Mavlyutov Institute of Mechanics 4 (2006): 207–23. http://dx.doi.org/10.21662/uim2006.1.019.

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The use of limited swelling polymers on The basis of polyacrylamide in waterproofing operations at oil wells. The rheological behavior of complex multiphase systems is discussed, combining the properties of polymer solutions, microgel structures and dispersions. A detailed description of the methodology and results of research rheological properties of suspensions of superabsorbent FS 305.

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7

Li, You Bing, Yan Pan, Zhen Zhen Sun, et al. "The Rheological Behavior of Polyamide-66/Liquid Crystal Polymer Blends." Advanced Materials Research 631-632 (January 2013): 100–103. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.100.

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The rheological behavior of polyamide-66 (PA66)/liquid crystal polymer (LCP) blends and the effect of liquid crystal polymer on melt flow rate were studied. A torque rheometer was used to investigate the rheological behavior of the PA66/LCP blends, and the effects of mass fraction of LCP, compatibilizer (PS-g-MAH), blending temperature and rotor speed on the rheological behavior of the blends were analyzed by an orthogonal experiment method. The results showed the above factors’ effects on the equilibrium torque of the blends were different individually, and the rheological behavior of the ble

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8

Subbotin, A. V., I. A. Nyrkova, and A. N. Semenov. "The Rheological Behavior of Polymer Solution Threads." Высокомолекулярные соединения С 65, no. 1 (2023): 14–30. http://dx.doi.org/10.31857/s2308114723700322.

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Theoretical results of the authors in the field of the capillary thinning of polymer solution threads are reviewed. The dynamics of threads of both concentrated solutions without entanglements and dilute solutions, where hydrodynamic interactions play an important role, is considered. A molecular approach, in which macromolecules are simulated by a semiflexible chain, is used as a basis. This makes it possible to describe, from common positions, the nonlinear elasticity of solution and interactions taking into account the orientation of the chains. Particular attention is given to thread thinn

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9

Timoshin, Yuriy N., and Еvgeniy A. Kirsanov. "Non-Newtonian Flow of Hydrolyzed Polyacrylamide Solution." Liquid Crystals and their Application 23, no. 3 (2023): 77–86. http://dx.doi.org/10.18083/lcappl.2023.3.77.

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Structural rheological model is used to describe the rheological behavior of hydrolyzed polyacrylamide aqueous solutions. The change in viscosity during stationary flow is explained by structure change of the polymer solution associated with contacts between macromolecules. Flow curves are well approximated by the generalized flow equation, except for the region of high shear rates, where the phenomenon of shear thickening is observed. The behavior of the rheological equation coefficients with a change in the polymer concentration is consistent with the conclusions of the structural rheologica

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10

SRINIVASARAO, MOHAN. "RHEOLOGY AND RHEO-OPTICS OF POLYMER LIQUID CRYSTALS." International Journal of Modern Physics B 09, no. 18n19 (1995): 2515–72. http://dx.doi.org/10.1142/s0217979295000951.

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The rheological and rheo-optical properties of nematic solutions of rodlike polymers are discussed. Magnetic field induced instability in the twist geometry is discussed in terms of the flow properties of these solutions. The rheological properties of these nematic solutions are compared to isotropic solutions of the same polymer. The behavior in shear flow of nematic solutions is discussed in terms of the Ericksen-Leslie equations. Deviations from those solutions are also discussed in context to polymeric nematics.

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11

Matveenko, V. N., and E. A. Kirsanov. "Structural Causes of the Non-Newtonian Behavior of Fluid Systems." Журнал физической химии 97, no. 8 (2023): 1137–54. http://dx.doi.org/10.31857/s0044453723080162.

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This review considers the well-known results of rheological studies, first of all, the viscosity and flow curves of various dispersed and polymer systems. The existing explanations of the causes of non-Newtonian flow are presented. Various rheological models are described, in which a change in viscosity is associated with a change in the structure of a substance. The new structural rheological model proposed by us is a generalization of the Casson and Cross rheological models. Its scope includes various structured systems: suspensions, emulsions, polymer solutions and melts, micellar solutions

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12

Tahir, Muhammad, Rafael E. Hincapie, and Leonhard Ganzer. "An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media." Applied Sciences 10, no. 12 (2020): 4152. http://dx.doi.org/10.3390/app10124152.

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This paper uses a combination of approaches to evaluate the viscoelastic phenomenon in high-molecular-weight polymers (24–28 M Daltons) used for enhanced oil recovery (EOR) applications. Rheological data were cross-analyzed with single- and two-phase polymer flooding experiments in outcrop cores and micromodels, respectively. First, the impact of semi-harsh conditions (salinity, hardness, and temperature) was evaluated. Second, the impact of polymer degradation (sand face flow), focusing on the viscoelastic properties, was investigated. Finally, polymer viscoelastic properties were characteriz

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13

Navaie, Farhood, Ehsan Esmaeilnezhad, and Hyoung-Jin Choi. "Effect of Rheological Properties of Polymer Solution on Polymer Flooding Characteristics." Polymers 14, no. 24 (2022): 5555. http://dx.doi.org/10.3390/polym14245555.

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Polymer flooding is an appropriate enhanced oil recovery (EOR) process that can increase macroscopic sweep efficiency. We examined two polymeric superpushers at different salinities (10,000 and 42,000 ppm of NaCl and 18,000 ppm of CaCl2) and temperatures (30 to 75 °C) as polymer-flooding agents for the EOR process. Rheological and thixotropic tests were attempted to find shear viscosity change when the polymer solutions were introduced under different salinity and temperatures, followed by describing the rheological behavior with the two most common rheological models used for polymer solution

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14

Bensadoun, Farida, Nadir Kchit, Catherine Billotte, François Trochu, and Edu Ruiz. "A Comparative Study of Dispersion Techniques for Nanocomposite Made with Nanoclays and an Unsaturated Polyester Resin." Journal of Nanomaterials 2011 (2011): 1–12. http://dx.doi.org/10.1155/2011/406087.

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Over the last few years, polymer/clay nanocomposites have been an area of intensive research due to their capacity to improve the properties of the polymer resin. These nanocharged polymers exhibit a complex rheological behavior due to their dispersed structure in the matrix. Thus, to gain fundamental understanding of nanocomposite dispersion, characterization of their internal structure and their rheological behavior is crucial. Such understanding is also key to determine the manufacturing conditions to produce these nanomaterials by liquid composite molding (LCM) process. This paper investig

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15

Choi, Gwan-Young, Ho-Gyum Kim, Young-Ho Kim, et al. "The rheological behavior of immiscible polymer blends." Journal of Applied Polymer Science 86, no. 4 (2002): 917–24. http://dx.doi.org/10.1002/app.11012.

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16

Binti Joohari, Ilya, and Filippo Giustozzi. "Hybrid Polymerisation: An Exploratory Study of the Chemo-Mechanical and Rheological Properties of Hybrid-Modified Bitumen." Polymers 12, no. 4 (2020): 945. http://dx.doi.org/10.3390/polym12040945.

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In this study, the mechanical and rheological properties of hybrid polymer-modified bitumen (PMB) have been investigated. For this purpose, nine different polymers—including crumb rubber, elastomers and plastomers at varying content—were studied to evaluate their mechanical performance as single polymers, first, and as a combination of two or more polymers as a hybrid polymer blend. Subsequently, the hybrid polymer blends were added in a relatively small percentage into the base bitumen to study its influence on the rheological performance of hybrid PMB. The mechanical properties identified fr

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17

Oyanagi, Yasushi, and Kazuhisa Kubota. "Pressure Effects on Rheological Behavior of Melt Polymers – A Discussion in Relation to Polymer Processing." Journal of Polymer Engineering 7, no. 1 (1986): 47–76. http://dx.doi.org/10.1515/polyeng-1986-0105.

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Abstract Polymers have large bulk compressibility in the molten state /1/ and their rheological properties are largely affected by pressure applied in polymer processing. The volumetric strain induced by pressure consists of instantaneous and retarded elastic strains, both of which are proportional to pressure, and recover reversibly when pressure is removed. In many crystalline polymers, as observed by B. Maxwell for polyethylene, retarded elastic strain is large, and due mostly to pressure crystallization. This paper describes results of experimental studies relating pressure effects on rheo

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18

Rodrigues, Gardenia Barbosa Carrijo, Josemar Gonçalves de Oliveira Filho, Adriano Jakelaitis, et al. "Hand sanitizer gel formulations: Influence of polymer type on the rheological properties." Research, Society and Development 13, no. 4 (2024): e6313445531. http://dx.doi.org/10.33448/rsd-v13i4.45531.

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COVID-19 increased the demand for alcohol-based hand sanitizer in establishments. The present study aimed to characterize different polymers and/or polymer mixtures with the potential to be used to produce alcohol-based gel hand sanitizers and evaluate the different formulations of alcohol gel as to their rheological properties. Polymers and polymer blends (natural and/or synthetic) were characterized by DSC and FTIR/NIR analysis. Six were polymers or blends of polymers efficient to production of this product in the concentration of 70% ethanol (w/w). Alcohol-based hand sanitizer gel formulati

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19

Pal, Rajinder, Parth Deshpande, and Smit Patel. "Influence of Added Cellulose Nanocrystals on the Rheology of Polymers." Nanomaterials 15, no. 2 (2025): 95. https://doi.org/10.3390/nano15020095.

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The interactions between cellulose nanocrystals and six different polymers (three anionic, two non-ionic, and one cationic) were investigated using rheological measurements of aqueous solutions of nanocrystals and polymers. The experimental viscosity data could be described adequately by a power-law model. The variations in power-law parameters (consistency index and flow behavior index) with concentrations of nanocrystals and polymers were determined for different combinations of nanocrystals and polymers. The interactions between nanocrystals and the following polymers: anionic sodium carbox

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20

Amri, Nedjla, Djamila Ghemati, Nadia Bouguettaya, and Djamel Aliouche. "Swelling Kinetics and Rheological Behavior of Chitosan-PVA / Montmorillonite Hybrid Polymers." Periodica Polytechnica Chemical Engineering 63, no. 1 (2018): 179–89. http://dx.doi.org/10.3311/ppch.12227.

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This study involved preparation of hybrid polymer systems based on chitosan-poly(vinyl alcohol) (PVA) blends and modified Montmorillonite. These structures were characterized through microscopy and infrared spectroscopy; swelling measurements were performed to explore polymer absorbency. The behavior of polymer systems was studied through steady and oscillatory shear rheology. Results showed that more stable blend membranes were formed due to the strong interaction between chitosan and PVA. The membranes exhibited appreciable water uptake and were sensitive to saline solution with a slight shr

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21

Laas, A. A., G. O. Rudakov, G. V. Pyshnograi, and K. B. Koshelev. "Structural-Phenomenological Rheological Model for Engineering Calculations of Polymeric Media Flows." Izvestiya of Altai State University, no. 4(126) (September 9, 2022): 115–22. http://dx.doi.org/10.14258/izvasu(2022)4-18.

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Studying the behavior of flows of solutions and polymer melts in the field of nonlinear viscoelasticity allows describing the rheological properties in more details and more accurately assess the adequacy of rheological models. A new structural-phenomenological model is proposed to describe the rheological behavior of melts of branched polymers. This model can be recommended for engineering calculations of flows of polymeric media. The model is obtained from the modified Vinogradov-Pokrovsky model which is based on the microstructur-al approach and describes the dynamics of a polymer fluid. St

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22

Wen, Xin, Lei Wang, Xiaojuan Lai, et al. "Polymerization Behavior and Rheological Properties of a Surfactant-Modified Reactive Hydrophobic Monomer." Chemistry 5, no. 4 (2023): 2598–612. http://dx.doi.org/10.3390/chemistry5040168.

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The structures and properties of hydrophobic association polymers can be controlled using micelles. In this work, we synthesize a reactive hydrophobic surfactant monomer, KS-3, from oleic acid, N,N-dimethylpropylenediamine, and allyl chloride. A strong synergistic effect between KS-3 and cocamidopropyl betaine in aqueous solution enhances the hydrophilic dispersibility of KS-3, thereby transforming spherical micelles into cylindrical micelles. KS-3 was grafted onto a polyacrylamide chain via aqueous free-radical polymerization to obtain RES, a hydrophobic association polymer. Structural analys

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23

Dörr, Dominik, Tobias Standau, Svenja Murillo Castellón, Christian Bonten, and Volker Altstädt. "Rheology in the Presence of Carbon Dioxide (CO2) to Study the Melt Behavior of Chemically Modified Polylactide (PLA)." Polymers 12, no. 5 (2020): 1108. http://dx.doi.org/10.3390/polym12051108.

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For the preparation of polylactide (PLA)-based foams, it is commonly necessary to increase the melt strength of the polymer. Additives such as chain extenders (CE) or peroxides are often used to build up the molecular weight by branching or even crosslinking during reactive extrusion. Furthermore, a blowing agent with a low molecular weight, such as carbon dioxide (CO2), is introduced in the foaming process, which might affect the reactivity during extrusion. Offline rheological tests can help to measure and better understand the kinetics of the reaction, especially the reaction between the po

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Guseva, M. A., L. A. Prokopova, and М. A. Khaskov. "Determination of the melting point of solid polymers by rheological method." Industrial laboratory. Diagnostics of materials 87, no. 7 (2021): 38–43. http://dx.doi.org/10.26896/1028-6861-2021-87-7-38-43.

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The rheological properties of polymer systems determine their deformation behavior and the relationship between stresses, strains and strain rates. We present the results of determining the melting points of solid polymer compounds by the rheological method. Tests were carried out using a rotary rheometer in an oscillating mode. Using the obtained thermomechanical dependences, the experimental data were compared with the values determined by standard analytical (capillary method) and thermal (differential scanning calorimetry) methods. The viscous and elastic behavior of the samples were analy

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Cao, Renyi, Linsong Cheng, and Y. Zee Ma. "Model for Rheological Behavior of Crude Oil and Alkali-Surfactant- Polymer Emulsion." Open Fuels & Energy Science Journal 7, no. 1 (2014): 55–61. http://dx.doi.org/10.2174/1876973x01407010055.

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Characterization of rheological behavior of alkali-surfactant-polymer (ASP) solution and oil emulsion is difficult, due to the complex chemical components and various physiochemical reactions with oil during chemical flooding. Through rheological experiments of ASP and crude oil emulsion, this paper presents the studies on influencing factors of rheological behavior, including interfacial tension, polymer and water cut, and discusses the stability mechanism of ASP and crude oil emulsion. The relationships among viscosity, interfacial tension, water cut and sheer rate were built through fitting

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Arrigo, Rossella, Giulio Malucelli, and Francesco Paolo La Mantia. "Effect of the Elongational Flow on the Morphology and Properties of Polymer Systems: A Brief Review." Polymers 13, no. 20 (2021): 3529. http://dx.doi.org/10.3390/polym13203529.

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Polymer-processing operations with dominating elongational flow have a great relevance, especially in several relevant industrial applications. Film blowing, fiber spinning and foaming are some examples in which the polymer melt is subjected to elongational flow during processing. To gain a thorough knowledge of the material-processing behavior, the evaluation of the rheological properties of the polymers experiencing this kind of flow is fundamental. This paper reviews the main achievements regarding the processing-structure-properties relationships of polymer-based materials processed throug

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Cui, Yi, Yang Sui, Peng Wei, et al. "Rationalizing the Dependence of Poly (Vinylidene Difluoride) (PVDF) Rheological Performance on the Nano-Silica." Nanomaterials 13, no. 6 (2023): 1096. http://dx.doi.org/10.3390/nano13061096.

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Research on the rheological performance and mechanism of polymer nanocomposites (PNCs), mainly focuses on non-polar polymer matrices, but rarely on strongly polar ones. To fill this gap, this paper explores the influence of nanofillers on the rheological properties of poly (vinylidene difluoride) (PVDF). The effects of particle diameter and content on the microstructure, rheology, crystallization, and mechanical properties of PVDF/SiO2 were analyzed, by TEM, DLS, DMA, and DSC. The results show that nanoparticles can greatly reduce the entanglement degree and viscosity of PVDF (up to 76%), with

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Sigonya, Sisonke, Teboho Clement Mokhena, Paul Mayer, Talent Raymond Makhanya, and Thabang Hendrica Mokhothu. "Electrospinning and Rheological Characterization of Polyethylene Terephthalate and Polyvinyl Alcohol with Different Degrees of Hydrolysis Incorporating Molecularly Imprinted Polymers." Polymers 16, no. 23 (2024): 3297. http://dx.doi.org/10.3390/polym16233297.

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This study investigates the electrospinning and rheological properties of polyethylene terephthalate (PET) and polyvinyl alcohol (PVA) with varying degrees of hydrolysis (DH) for molecularly imprinted polymer (MIP) incorporation. The morphology and properties of the electrospun nanofibers were evaluated, revealing that PVA nanofibers exhibited smoother and more uniform structures compared to PET fibers. The rheological behavior of the polymer solutions was also characterized, showing that PVA 99 DH solution exhibited shear-thinning behavior due to the unique structural properties of the polyme

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Asrorov, Ummatjon A. "Polyacrylamide’s Rheological and Physicochemical Properties: Analysis and Applications." East European Journal of Physics, no. 4 (December 8, 2024): 413–18. https://doi.org/10.26565/2312-4334-2024-4-48.

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This study presents an in-depth rheological characterization of polyacrylamide polymers produced locally, employing the Anton Paar MCR 92 (Modular Compact Rheometer). The polymer samples were systematically analyzed to understand their response to various external stimuli. Using infrared spectroscopy, the composition of the polymer was meticulously verified, ensuring a robust assessment of its molecular structure and chemical stability under different environmental conditions. Our findings elucidate the significant potential of polyacrylamide in diverse industrial applications, attributable to

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Javanbakht, T. "Investigation on the Rheological Properties of Polydimethylsiloxane." Journal of Engineering Sciences 9, no. 1 (2022): C1—C7. http://dx.doi.org/10.21272/jes.2022.9(1).c1.

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This paper focuses on studying the rheological properties of polydimethylsiloxane (PDMS). This polymer has been used to fabricate membranes and filters in engineering. The analysis of the rheological properties of this polymer is required for a further investigation of its mechanical behavior. In this study, the rheological behavior of PDMS is reported at different temperatures. This polymer showed steady shear viscosity during a short duration. However, this behavior changed with time and increased more with increasing temperature. The impact of the temperature increase was also observed when

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Younes, Basel. "Simple Rheological Analysis Method of Spinnable-Polymer Flow Properties Using MFI Tester." Indian Journal of Materials Science 2015 (July 5, 2015): 1–8. http://dx.doi.org/10.1155/2015/790107.

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Rheological characterization of polymers explains the flow behaviour and viscoelastic properties and tests fibre-forming ability. The current method investigates the viscoelastic properties and morphology of polymers and finds the rheological data and the right polymer viscosity, which is determining the best processing temperature. The right processing temperature saves the power, the material, and the time needed for production. After calculating polymers viscosity by using MFI tester, the method investigates rheological properties and surface shape at different temperatures and loads. The m

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Guo, Xiaodie, Xuejiao Chen, Wenjing Zhou, and Jinjia Wei. "Effect of Polymer Drag Reducer on Rheological Properties of Rocket Kerosene Solutions." Materials 15, no. 9 (2022): 3343. http://dx.doi.org/10.3390/ma15093343.

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Adding drag reduction agent (DRA) to rocket kerosene is an effective way to reduce the pipeline resistance of rocket kerosene transportation systems. However, so far, there have been few research reports on the effect of DRA on the rheological properties of rocket kerosene solution, especially from a microscopic perspective. In this study, coarse-grained molecular dynamics simulations were conducted to investigate the rheological properties of rocket kerosene solutions with DRAs of different chain lengths and concentrations. The results showed that the viscosity of DRA—kerosene solution is gen

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Zhao, Xinyang, Benke Li, Sijun Liu, Li Peng, Xianbo Huang, and Wei Yu. "Modeling linear and nonlinear rheology of industrial incompatible polymer blends." Journal of Rheology 68, no. 2 (2024): 187–204. http://dx.doi.org/10.1122/8.0000728.

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The ability to accurately predict the rheological behavior of the blends of two incompatible polymers is critical to the polymer industry. The constitutive modeling of incompatible polymer blends requires understanding the structure and dynamics of the blends across different length scales. The polydispersity of chain length at the molecular level and nonuniformity of flow field due to dispersed domains at the mesoscopic level present significant challenges to this industrially relevant problem. This work proposes a modeling framework for linear and nonlinear rheology of industrial incompatibl

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Huang, Bin, Xiaohui Li, Cheng Fu, Ying Wang, and Haoran Cheng. "Study Rheological Behavior of Polymer Solution in Different-Medium-Injection-Tools." Polymers 11, no. 2 (2019): 319. http://dx.doi.org/10.3390/polym11020319.

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Previous studies showed the difficulty during polymer flooding and the low producing degree for the low permeability layer. To solve the problem, Daqing, the first oil company, puts forward the polymer-separate-layer-injection-technology which separates mass and pressure in a single pipe. This technology mainly increases the control range of injection pressure of fluid by using the annular de-pressure tool, and reasonably distributes the molecular weight of the polymer injected into the thin and poor layers through the shearing of the different-medium-injection-tools. This occurs, in order to

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Aziz, Siti Aishah Abdul, Saiful Amri Mazlan, Ubaidillah Ubaidillah, et al. "Loss Factor Behavior of Thermally Aged Magnetorheological Elastomers." Materials 14, no. 17 (2021): 4874. http://dx.doi.org/10.3390/ma14174874.

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Polymer composites have been widely used as damping materials in various applications due to the ability of reducing the vibrations. However, the environmental and surrounding thermal exposure towards polymer composites have affected their mechanical properties and lifecycle. Therefore, this paper presents the effect of material-temperature dependence on the loss factor and phase shift angle characteristics. Two types of unageing and aging silicone-rubber-based magnetorheological elastomer (SR-MRE) with different concentrations of carbonyl iron particles (CIPs), 30 and 60 wt%, are utilized in

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HORIGOME, Misao, Makoto YADA, and Takenobu ISODA. "Rheological Behavior of PMMA Powder/ Associating Polymer Suspensions." Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan) 26, no. 3 (1998): 157–62. http://dx.doi.org/10.1678/rheology1973.26.3_157.

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Rodlert, Marlene, Christopher J. G. Plummer, Yves Leterrier, Jan-Anders E. Månson, and Henri J. M. Grünbauer. "Rheological behavior of hyperbranched polymer/montmorillonite clay nanocomposites." Journal of Rheology 48, no. 5 (2004): 1049–65. http://dx.doi.org/10.1122/1.1773780.

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Sunday, Daniel F., and David L. Green. "Thermal and Rheological Behavior of Polymer Grafted Nanoparticles." Macromolecules 48, no. 23 (2015): 8651–59. http://dx.doi.org/10.1021/acs.macromol.5b00987.

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La Mantia, F. P., A. Valenza, M. Paci, P. L. Magagnini, U. Pedretti, and A. Roggero. "Rheological behavior of a semirigid liquid crystal polymer." Polymer Engineering and Science 33, no. 15 (1993): 944–49. http://dx.doi.org/10.1002/pen.760331503.

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Zhao, X., G. K. Stylios, and R. M. Christie. "Rheological behavior of polymer solutions during fabric coating." Journal of Applied Polymer Science 107, no. 4 (2007): 2317–21. http://dx.doi.org/10.1002/app.27289.

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Steller, Ryszard T. "Rheological behavior of polymer melts with natural fibers." Journal of Applied Polymer Science 97, no. 4 (2005): 1401–9. http://dx.doi.org/10.1002/app.21156.

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Lepcio, Petr, Frantisek Ondreas, and Josef Jancar. "Rheological Behavior of Polystyrene-Based Nanocomposite Suspensions under LAOS." Materials Science Forum 851 (April 2016): 215–20. http://dx.doi.org/10.4028/www.scientific.net/msf.851.215.

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Polymer nanocomposites based on polyhedral oligomeric silsesquioxanes (POSS) and their solutions and suspensions are promising systems for fundamental research which could potentially utilize self-assembly approach in designing new nanocomposite materials. Numerous applications could benefit from understanding of these systems, for instance polymer solution based paints and varnishes. This work is an initial stage of a study which aim is to link macroscale thermomechanical properties with nanoscale structures found in polymer nanocomposites. To do so, a suitable experimental protocol for prepa

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Timofeenko, A. A., V. V. Timoshenko, E. A. Shutova, and V. M. Shapovalov. "Physico-mechanical and technological characteristics of composite materials based on mixtures of secondary thermoplastics." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 65, no. 2 (2020): 162–69. http://dx.doi.org/10.29235/1561-8358-2020-65-2-162-169.

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The physico-mechanical and technological characteristics of mixed waste of thermoplastic polymers, including that from the recyclable electronic and electrical equipment based on ABS plastic, were investigated. Target modifying additives were introduced into the composite system to improve the compatibility of polymer components of mixtures and the stable rheological properties of composition during processing. It is established that the secondary polymers behavior in their mixtures is caused by combination of their rheological characteristics and other parameters of mutual compatibility, that

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Gao, Nanxiao, Jian Chen, Min Qiao, Guangcheng Shan, Jingzhi Wu, and Qianping Ran. "Anionic Copolymers with Different Charge Densities for Regulating the Properties of Cement Pastes." Materials 15, no. 21 (2022): 7629. http://dx.doi.org/10.3390/ma15217629.

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Self-compacting concrete (SCC) is an extremely flowable concrete, which increases the probability of segregation and bleeding. Viscosity-modifying admixtures (VMAs) have been developed to improve the stability of SCC. Synthetic polymer VMAs have excellent water solubility and stability, and can be easily chemically prepared and modified. In this work, a series of copolymers based on anionic 2-acrylamido-2-methyl-propanesulfonic acid (AMPS) and nonionic N, N-dimethyl acrylamide (DMAA), with similar molecular weights but different charge densities, were prepared. The effect of the charge density

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Ion, Ioana, José Barroso Aguiar, Nicolae Angelescu, and Darius Stanciu. "Properties of Polymer Modified Concrete in Fresh and Hardened State." Advanced Materials Research 687 (April 2013): 204–12. http://dx.doi.org/10.4028/www.scientific.net/amr.687.204.

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It was carried out a study on the properties of polymer modified concrete (PCM) in fresh and hardened state. It was used three types of polymers: epoxy resins, polyurethane and methylcellulose in different percentages and different water cement ratio. The main objectives was to improve workability and rheological behavior of these mixtures in fresh state and mechanical strength tests on hard concrete. Has been investigated the polymer influence on compression strength and flexural strength and analyzing the time evolution of these strengths and participation of polymer in the microstructure fo

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Martín-Gómez, Aitor, Gerhard Gompper, and Roland Winkler. "Active Brownian Filamentous Polymers under Shear Flow." Polymers 10, no. 8 (2018): 837. http://dx.doi.org/10.3390/polym10080837.

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The conformational and rheological properties of active filaments/polymers exposed to shear flow are studied analytically. Using the continuous Gaussian semiflexible polymer model extended by the activity, we derive analytical expressions for the dependence of the deformation, orientation, relaxation times, and viscosity on the persistence length, shear rate, and activity. The model yields a Weissenberg-number dependent shear-induced deformation, alignment, and shear thinning behavior, similarly to the passive counterpart. Thereby, the model shows an intimate coupling between activity and shea

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Yasuda, Shugo. "Synchronized Molecular-Dynamics Simulation of the Thermal Lubrication of an Entangled Polymeric Liquid." Polymers 11, no. 1 (2019): 131. http://dx.doi.org/10.3390/polym11010131.

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The thermal lubrication of an entangled polymeric liquid in wall-driven shear flows between parallel plates is investigated by using a multiscale hybrid method, coupling molecular dynamics and hydrodynamics (i.e., the synchronized molecular dynamics method). The temperature of the polymeric liquid rapidly increases due to viscous heating once the drive force exceeds a certain threshold value, and the rheological properties drastically change at around the critical drive force. In the weak viscous-heating regime, the conformation of polymer chains is dominated by the flow field so that the poly

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Than, Yee Mon, Sarisa Suriyarak, and Varin Titapiwatanakun. "Rheological Investigation of Hydroxypropyl Cellulose–Based Filaments for Material Extrusion 3D Printing." Polymers 14, no. 6 (2022): 1108. http://dx.doi.org/10.3390/polym14061108.

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The rheological properties of drug–polymer mixtures have a significant influence on their processability when using transformative techniques, such as hot-melt-extrusion and material-extrusion 3D printing; however, there has been limited data on printable systems. This study investigated the rheological properties of 17 formulations of successful printed tablets for both immediate and controlled release. Hydroxypropyl cellulose was used in various ratios to obtain printable filaments in combination with various drugs (indomethacin or theophylline), polymers and disintegrants. The complex visco

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Mederic, P., M. Moan, M. H. Klopffer, and Y. Saint-Gerard. "Talc Filled Thermoplastic Composites: Melt Rheological Properties." Applied Rheology 13, no. 6 (2003): 297–304. http://dx.doi.org/10.1515/arh-2003-0019.

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Abstract The effects of composition and resulting morphology on the rheology of thermoplastics filled with different talc platelets were studied in the 0-22% range of volume fraction, Φ. The sufficiently filled polymer composites exhibit a rheological behavior which significantly differs from the pure polymers used in this work, a linear low density polyethylene, a low density polyethylene and a polyamide 12. The changes in the rheological behavior are influenced by the size, the concentration and the surface treatment of plate-like talc particles. They also depend on the chemical nature and v

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Panahi, Amirreza, Di Pu, Giovanniantonio Natale, and Anne M. Benneker. "Polymer concentration regimes from fractional microrheology." Journal of Rheology 68, no. 6 (2024): 849–62. http://dx.doi.org/10.1122/8.0000850.

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In this work, a framework for deriving theoretical equations for mean squared displacement (MSD) and fractional Fokker–Planck is developed for any arbitrary rheological model. The obtained general results are then specified for different fractional rheological models. To test the novel equations extracted from our framework and bridge the gap between microrheology and fractional rheological models, microrheology of polystyrene in tetrahydrofuran solutions at several polymer concentrations is measured. By comparing the experimental and theoretical MSDs, we find the fractional rheological parame

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