Gotowe bibliografie tematyczne / VISCOELASTIC POLYMER

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Gotowa bibliografia na temat „VISCOELASTIC POLYMER”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "VISCOELASTIC POLYMER"

Harper, B. D. "Influence of Polymer Viscoelasticity on a Bending Bilayer". Journal of Electronic Packaging 116, nr 3 (1.09.1994): 191–97. http://dx.doi.org/10.1115/1.2905685.

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The bending bilayer technique is commonly employed to provide an empirical assessment of the often significant thermal stresses that develop in thin polymer films used in microelectronic packaging. Polymers are known to exhibit time-dependent (viscoelastic) behavior that is greatly accelerated at elevated temperatures. The solution for a bilayer beam with a linear viscoelastic, thermorheologically simple film bonded to a linear elastic substrate is developed. A wide variety of assumed viscoelastic material properties are considered along with properties for several specific electronic polymers in order to illustrate the general effects of polymer viscoelasticity upon the thermal stress in a polymer film. Practical methods for deducing the relative significance of polymer viscoelasticity from empirical bending bilayer results are emphasized. Comparisons with experimental data for two polymides and one epoxy molding compound are also provided.

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Clarke, A., A. M. Howe, J. Mitchell, J. Staniland i L. A. Hawkes. "How Viscoelastic-Polymer Flooding Enhances Displacement Efficiency". SPE Journal 21, nr 03 (15.06.2016): 0675–87. http://dx.doi.org/10.2118/174654-pa.

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Summary Increasing flooding-solution viscosity with polymers provides a favorable mobility ratio compared with brine flooding and hence improves volumetric sweep efficiency. Flooding with a polymer solution exhibiting elastic properties has been reported to increase displacement efficiency, resulting in a sustained doubling of the recovery enhancement compared with the use of conventional viscous-polymer flooding (Wang et al. 2011). Flooding with viscoelastic-polymer solutions is claimed also to increase recovery more than expected from changes in capillary number alone (Wang et al. 2010). This increase in displacement efficiency by viscoelastic polymers is reported to occur because of changes in the steady-state-flow profile and enhancements in oil stripping and thread formation. However, within the industry there are doubts that a genuine effect is observed, or that improvements in displacement efficiency occur with field-applicable flow regimes (Vermolen et al. 2014). In this study, we demonstrate that flooding with viscoelastic-polymer solutions can indeed increase recovery more than expected from changes in capillary number. We show a mechanism of fluctuations in flow at low Reynolds number by which viscoelastic-polymer solutions provide improvements in displacement efficiency. The mechanism, known as elastic turbulence, is an effect previously unrecognized in this context. We demonstrate that the effect may be obtained at field-relevant flow rates. Furthermore, this underlying mechanism explains both the enhanced capillary-desaturation curves and the observation of apparent flow thickening (Delshad et al. 2008; Seright et al. 2011) for these viscoelastic solutions in porous media. The work contrasts experiments on flow and recovery by use of viscous and viscoelastic-polymer solutions. The circumstances under which viscoelasticity is beneficial are demonstrated. The findings are applicable to the design of formulations for enhanced oil recovery (EOR) by polymer flooding. A combination of coreflooding, micromodel flow, and rheometric studies is presented. The results include single-phase and multiphase floods in sandstone cores. Polymer solutions are viscoelastic [partially hydrolyzed polyacrylamide (HPAM)] or viscous (xanthan). The effects of molecular weight, flow rate, and concentration of the HPAMs are described. The data lead us to suggest a mechanism that may be used to explain the observations of improved displacement efficiency and why the improvement is not seen for all viscoelastic-polymer floods.

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Negmatov, Soyibjon, T. Ulmasov, Farxod Navruzov i S. Jovliyev. "Vibration damping composition polymer materials and coatings for engineering purpose". E3S Web of Conferences 264 (2021): 05034. http://dx.doi.org/10.1051/e3sconf/202126405034.

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To develop and create effective vibration-damping composite polymer materials (VDСPM) with high viscoelastic and strength properties, the choice of research objects to increase durability reduces vibration of parts and structures of machines consequently, the noise level in industrial premises is stated and substantiated. A method is described for studying the viscoelastic properties, adhesive strength, microhardness, impact strength of polymer coatings, and compositions based on them, filled with organomineral ingredients. The results of studies of the viscoelastic and physicomechanical properties of polymer composite materials based on epoxy polymers and an organomineral filler - rubber powder are presented. Based on complex analyzes and the obtained results of the study of the physicomechanical and viscoelastic properties of materials, several effective compositions of vibration-damping polymer materials using rubber powder have been developed.

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Ashrafi, Hosein, M. R. Bahadori i M. Shariyat. "Modeling of Viscoelastic Solid Polymers Using a Boundary Element Formulation with Considering a Body Load". Advanced Materials Research 463-464 (luty 2012): 499–504. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.499.

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In this work, a boundary element formulation for 2D linear viscoelastic solid polymers subjected to body force of gravity has been presented. Structural analysis of solid polymers is one of the most important subjects in advanced engineering structures. From basic assumptions of the viscoelastic constitutive equations and the weighted residual techniques, a simple but effective boundary element formulation is implemented for standard linear solid (SLS) model. The SLS model provides an approximate representation of observed behavior of a real advanced polymer in its viscoelastic range. This approach avoids the use of relaxation functions and mathematical transformations, and it is able to solve quasistatic viscoelastic problems with any load time-dependence and boundary conditions. Problem of pressurization of thick-walled viscoelastic tanks made of PMMA polymer, which subjected to a body force, is completely analyzed.

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Tahir, Muhammad, Rafael E. Hincapie i Leonhard Ganzer. "An Elongational and Shear Evaluation of Polymer Viscoelasticity during Flow in Porous Media". Applied Sciences 10, nr 12 (17.06.2020): 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 characterized, proposing a threefold rheological approach of rotational, oscillatory, and elongational behavior. Data from the rheological approaches were cross-analyzed with core flooding experiments and performed at a room temperature of 22 °C and at a higher temperature of 55 °C. The change in polymer viscoelastic properties were analyzed by investigating the effluents from core flooding experiments. Oil recovery experiments in micromodel helped our understanding of whether salinity or hardness has a dominating impact on in situ viscoelastic polymer response. These approaches were used to study the impact of mechanical degradation on polymer viscoelasticity. The brines showed notable loss in polymer viscoelastic properties, specifically with the hard brine and at higher temperature. However, the same polymer solution diluted in deionized water exhibited stronger viscoelastic properties. Multiple flow-behaviors, such as Newtonian, shear thinning, and thickening dominated flow, were confirmed through pressure drop analysis against interstitial velocity as already reported by other peer researchers. Turbulence-dominated excessive pressure drop in porous media was calculated by comparing core flood pressure drop data against pressure data in extensional viscometer–rheometer on a chip (eVROC®). In addition, a significant reduction in elastic-dominated flow was confirmed through the mechanical degradation that happened during core flood experiments, using various approaches. Finally, reservoir harsh conditions (high temperature, hardness, and salinity) resulted in a significant reduction in polymer viscoelastic behavior for all approaches.

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Brostow, Witold, Hanna Fałtynowicz, Osman Gencel, Andrei Grigoriev, Haley E. Hagg Lobland i Danny Zhang. "Mechanical and Tribological Properties of Polymers and Polymer-Based Composites". Chemistry & Chemical Technology 14, nr 4 (15.12.2020): 514–20. http://dx.doi.org/10.23939/chcht14.04.514.

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A definition of rigidity of polymers and polymer-based composites (PBCs) by an equation is formulated. We also discuss tribological properties of polymers and PBCs including frictions (static, sliding and rolling) and wear. We discuss connections between viscoelastic recovery in scratch resistance testing with brittleness B, as well as Charpy and Izod impact strengths relations with B. Flexibility Y is related to a dynamic friction. A thermophysical property, namely linear thermal expansivity, is also related to the brittleness B. A discussion of equipment needed to measure a variety of properties is included.

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Kubo, Takao, Shiro Ota, Masatoshi Oda, Kenichi Hashishita i Yasuhiro Kakinuma. "Evaluation of Polished Surface for Viscoelastic Polymer". Advanced Materials Research 126-128 (sierpień 2010): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.493.

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Viscoelastic polymers are used as one of coating materials for protecting the products from scratches. Presently, the repair of the coating surface for removing dust or extraneous matters has been performed through several polishing processes. However, it becomes increasingly difficult to polish its surface by only applying good skill and experience of skilled worker because a leading-edge viscoelastic polymer for coating is further scratch-resistant. Thus, based on quantitative evaluation of relation between polishing process and finished surface, it is necessary to make the polishing process appropriate for the leading-edge viscoelastic polymers. In this study, we attempt to establish the evaluation method of the polished surface and clarify the surface condition with invisible scratches.

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Azad, Madhar S., i Japan J. Trivedi. "Extensional Effects during Viscoelastic Polymer Flooding: Understanding Unresolved Challenges". SPE Journal 25, nr 04 (27.04.2020): 1827–41. http://dx.doi.org/10.2118/201112-pa.

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Summary Several studies have tried to relate polymers’ enhanced oil recovery (EOR) potential to their viscoelastic characteristics such as onset, rheo thickening, extensional viscosity, and Deborah number (De). Contradictions prevail when it comes to reduction in residual oil saturation (Sor) during polymer flooding and the role of extensional properties. De calculated using the oscillatory relaxation time fails to explain the different pressure profiles exhibited by the viscous and viscoelastic polymers. Extensional viscosity has been ignored in many studies as the reason for additional Sor reduction based on the core-scale apparent viscosity and core-scale capillary number (Nc). In recent studies, a significant oil mobilization was shown by the viscoelastic polymers even before the critical Nc, which indicates that the capillary theory breaks out under specific conditions during polymer flooding. Moreover, the additional residual oil recovery caused by the high-salinity polymer solutions cannot be explained by the oscillatory De. In this paper, we compile and examine many such unresolved challenges from various literature with rheological and petrophysical insights. The uniaxial bulk extensional rheology is performed on the relevant polymers using a capillary breakup extensional rheometer to measure the extensional relaxation time, maximum extensional viscosity at the critical De, and strain hardening index. A detailed analysis signifies the role of extensional rheology on the viscoelastic onset, rheo thickening, and Sor reduction even under varying salinity conditions. The results also highlight the advantages of extensional rheology over oscillatory rheology and validate the capillary theory using modified capillary number.

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Li, Can-Qi, Horst Henning Winter, Yuan-Qi Fan, Geng-Xin Xu i Xue-Feng Yuan. "Time–Concentration Superposition for Linear Viscoelasticity of Polymer Solutions". Polymers 15, nr 7 (6.04.2023): 1807. http://dx.doi.org/10.3390/polym15071807.

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The concentration dependence of linear viscoelastic properties of polymer solutions is a well-studied topic in polymer physics. Dynamic scaling theories allow qualitative predictions of polymer solution rheology, but quantitative predictions are still limited to model polymers. Meanwhile, the scaling properties of non-model polymer solutions must be determined experimentally. In present paper, the time–concentration superposition (TCS) of experimental data is shown to be a robust procedure for studying the concentration scaling properties of binary and ternary polymer solutions. TCS can not only identify whether power law scaling may exist or not, and over which concentration range, but also unambiguously estimate the concentration scaling exponents of linear viscoelastic properties for a range of non-model polymer solutions.

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Kim, Taehyung, Kyoungsei Choi i Won Ho Jo. "A Stochastic Dynamics Simulation of Viscoelastic Properties of Polymer Blends: Intermolecular Interaction Effects". Journal of Polymer Engineering 18, nr 1-2 (1.03.1998): 1–16. http://dx.doi.org/10.1515/polyeng-1998-1-203.

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Abstract Stochastic dynamics simulations were performed to investigate the viscoelastic properties of polymer blends. In this simulation, three model systems with different intermolecular interactions are used to examine the effect of intermolecular interaction on the viscoelastic properties of polymer blends. Structural information such as the radius of gyration, orientation factor and radial distribution function of polymers is calculated from computer simulations as a function of shear rate and then is related to simulated viscoelastic properties of polymer blends. The effect of intermolecular interaction on the viscosity becomes different depending upon the magnitude of shear rate. At lower shear rate regions, more attractive intermolecular interaction results in lower viscosity due to chain stretching. But, at higher shear rate regions, more attractive interaction results in higher viscosity due to more dense packing of chains induced by the intermolecular attraction.

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Rozprawy doktorskie na temat "VISCOELASTIC POLYMER"

Barakos, George. "Viscoelastic simulations in polymer processing". Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6497.

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The scope of this thesis is the mathematical modelling and the numerical simulation of polymer processing. In recent years there has been considerable progress in understanding and modelling phenomena related to flow of polymer melts through polymer processing machinery. Much of the progress is due to the numerical solution of integral-type constitutive equations relating stress and deformation and representing the fading memory of these fluids. In this direction, an integral constitutive equation of the K-BKZ type has been used for simulating the extrusion of a Low-Density Polyethylene melt (IUPAC LDPE sample A). The influence of temperature has also been examined by performing a complete non-isothermal flow simulation. In addition, simulations have been performed for the well-known phenomenon of extrudate bending, when extrusion is performed through a flat die with walls kept at different temperatures. The simulations reveal that the combination of viscous and elastic phenomena result in a significant swelling of the extrudate characterized by a profound asymmetry. Finally, a comparison has been performed of different polyethylene melts based on the predictions of the model used. The results reveal the intense viscoelastic character of the LDPE and show clearly the importance of viscoelasticity in polymer processing. Moreover, they give a wealth of information about the influence of material properties on polymer behaviour during processing especially as far as vortex growth and extrudate swell diameter are concerned. (Abstract shortened by UMI.)

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Bandey, Helen Luanne. "Viscoelastic characteristics of electroactive polymer films". Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30016.

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The quartz crystal microbalance (QCM) in association with the crystal impedance technique was used to study the viscoelastic properties of electroactive polymer films. In particular, a new analysis for the interpretation of crystal impedance data, acquired dynamically during the deposition of polyvinylferrocene (PVF) and polybithiophene (PBT), was developed and applied. Qualitatively, the raw crystal impedance data gave information on the departure from rigidity. However, for a quantitative analysis, equivalent circuit modelling was employed. The modified Butterworth Van-Dyke lumped-element equivalent circuit model was used to extract inductive and resistive components that relate to film mass and energy loss (diagnostic for film (non)-rigidity), respectively, during deposition. A new equivalent circuit fitting routine was developed that described the physical characteristics of polymer films in solution in terms of the complex shear moduli, G' (energy storage) and G'' (energy loss) of the film. The model consists of three components that take into account the viscoelastic polymer film, the deposition solution and the surface roughness features of the QCM. For PVF and PBT deposition, it was found that the shear modulus was a function of film thickness and had limiting values of G' G'' 108-109 and G' G'' 106-107 dyne cm-2, respectively. This suggests that PBT films behave as Maxwell fluids, whereas PVF films behave as rubbery solids.

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Mahaffy, Rachel Elaine. "The quantitative characterization of the viscoelastic properties of cells and polymer gels /". Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004328.

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Gordnian, Kamyar. "Crystallization and thermo-viscoelastic modelling of polymer composites". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63361.

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Process models of composite materials are useful tools for understanding the effect of process parameters and variables and reducing manufacturing risks and costs. The sub-model approach for process modelling has been applied to thermoset composites since the early 1980s. In this approach, analysis is performed with different sub-models such as thermochemical, flow, void and stress, and the analysis results are sequentially transferred from one sub-model to the next, until the analysis is complete. In recent years there has been growing use of high performance thermoplastics such as PEEK and PEKK in aircraft structures, and hence process models for thermoplastics are increasingly of interest. During processing of thermoplastic materials, the material undergoes both melting and crystallization. Therefore a major component of the thermochemical/thermophysical sub-model for process modelling of thermoplastics is the crystallization/melt kinetics model. Most of the crystallization kinetics models in the literature are only valid for either constant temperatures or cooling at constant cooling rates. Furthermore, the number of melt kinetics models is very limited and their application restricted to small heating rates. As a material point in the part may undergo complex temperature cycles, a rate-type crystallization/melt kinetics model which is independent of the temperature cycle is desired. Another problem in processing is development of residual stresses and distortions, which are analyzed in the stress sub-model using mechanical response constitutive models such as thermo-elastic, CHILE and viscoelastic. Most thermoplastic materials such as PEEK are indeed viscoelastic, however their unrelaxed values of moduli are temperature dependent, ie their behaviour is ‘thermo-rheologically complex’. In this thesis the crystallization and melt behaviour of PEEK carbon fibre composites is investigated using DSC experiments. A rate type crystallization kinetics model is developed for prediction of degree of crystallinity during crystallization process. A concept of ‘master melt curve’ is introduced and is used along with the crystallization kinetics model for prediction of crystallinity change during an arbitrary process. Thermo-viscoelastic behaviour of the material is studied using DMA experiments. A thermo-viscoelastic (TVE) constitutive model is developed and is generalized to three dimensional cases. Some case studies are analyzed and validity of models are investigated.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate

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Gallican, Valentin. "Homogenization estimates for polymer-based viscoelastic composite materials". Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS543.

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Cette thèse porte sur l’étude de la réponse harmonique macroscopique de matériaux composites viscoélastiques à base polymère. Nous nous intéressons tout d’abord à l’étude de matériaux composites à renforts particulaires dont la matrice est modélisée à partir de modèles de Zener fractionnaires et contient des particules sphériques élastiques. Le comportement asymptotique du module complexe macroscopique est étudié à l’aide de principes de stationnarité appliqués à la viscoélasticité complexe. Il est à noter que quatre conditions exactes sont obtenues sur les modules de stockage et de perte. Les deux premières correspondent aux réponses élastiques découplées à haute et basse fréquences, tandis que les deux autres résultent du couplage viscoélastique caractérisant la phase de transition vitreuse. A partir de celles-ci, nous développons des modèles micromécaniques viscoélastiques approchés sur toute la gamme de fréquences. Les modèles approchés font intervenir des développements en séries de Dirichlet-Prony afin d’estimer le comportement viscoélastique macroscopique. Ces derniers sont présentés à l’aide du schéma GSC dans le cas de constituants isotropes et comparés à des simulations FFT réalisées sur des microstructures périodiques pour différentes fractions volumiques de particules. Nous nous attachons ensuite à modéliser la réponse d’explosifs composés de poudres de TATB avec adjonction d’une phase polymère par une approche micromécanique en deux étapes. Nous commençons par étudier l’élasticité effective de polycristaux de TATB sans liant en fonction de nombreux paramètres morphologiques. Le comportement viscoélastique macroscopique est ensuite approché par des modèles micromécaniques et comparé à des simulations FFT et des données expérimentales
This Ph.D. work deals with the description of the time harmonic response of polymer-based viscoelastic composite materials. On the one hand, the emphasis is put on particulate-reinforced composite materials whose matrix is defined by fractional Zener models containing elastic spherical particles. The asymptotic behaviour of the overall complex moduli is studied by resorting to stationary principles for complex viscoelasticity. Four exact conditions on the storage and loss moduli are obtained. Two of them classically correspond to the uncoupled elastic responses at low and high frequencies while the two others result from the viscoelastic coupling in the transient regime. These conditions only involve the strain fields solutions of asymptotic elastic problems. Based on these conditions, we propose to develop approximate viscoelastic homogenization models for the whole frequency range. They classically make use of Dirichlet-Prony series to estimate the overall viscoelastic behaviour. Such models are presented by means of the GSC scheme for isotropic constituents and compared to FFT full-field computations carried out on periodic microstructures with various volume fractions of particles. On the other hand, we focus on the modeling of TATB-based pressed polymer-bonded explosives seen as jointed polycrystals by means of two-step multiscale modeling. We first investigate the effective elasticity of binder-free TATB-based polycrystals with respect to various morphological parameters. Afterwards, the overall viscoelastic behaviour is assessed by making use of mean-field schemes and compared to FFT full-field computations and experimental data

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Pandey, Anurag V. "Nonlinear viscoelastic response of a thermodynamically metastable polymer melt". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9096.

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Ultra High Molecular Weight Polyethylene (UHMw-PE) is an engineering polymer that is widely used in demanding applications because of its un-paralleled properties such as high abrasion resistance, high-modulus and high-strength tapes and fibres, biaxial films etc. In common practice, to achieve the uniaxial and the biaxial products, the solution processing route is adopted to reduce the number of entanglements per chain, such as found in Dyneema(R) from DSM(R). Another elegant route to reduce the number of entanglements to ease solid-state processing is through controlled polymerisation using a single-site catalytic system. In this theses, how different polymerisation condition, such as temperature and time control molecular weight and the resultant entangled state in synthesised disentangled UHMw-PE is addressed. Linear dynamic melt rheology is used to follow entanglement formation in an initially disentangled melt. With the help of rheological studies, heterogeneity in the distribution of entanglements along the chain length and the crystal morphology produced during polymerisation is considered. For the understanding of influence of large shear flow on melt dynamics large amplitude oscillatory shear (LAOS) is used and the non-linear viscoelastic regime is explored. A remarkable feature of overshoot in loss (viscous) modulus with increasing deformation (strain) in UHMw-PE melt in the LAOS is observed. This observation is characteristic of colloidal systems. The role of entanglement density in the amorphous region of the synthesised disentangled UHMw-PE (semi-crystalline polymers) on the melting and crystallisation is presented. To understand the effect of topological differences on melting behaviour, nascent entangled, nascent disentangled and melt-crystallised samples have been used. The role of superheating on the melting process is also addressed. Preliminary results on characteristic melting time of a crystal using TM-DSC are also presented.

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Kalakkunnath, Sumod. "VISCOELASTIC RELAXATION CHARACTERISTICS OF RUBBERY POLYMER NETWORKS AND ENGINEERING POLYESTERS". UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/486.

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The relaxation characteristics of rubbery poly(ethylene oxide) [PEO] networks have been investigated as a function of network composition and architecture via dynamic mechanical analysis and broadband dielectric spectroscopy. A series of model networks were prepared via UV photopolymerization using poly(ethylene glycol) diacrylate [PEGDA] as crosslinker: variations in crosslink density were achieved either by the introduction of water in the prepolymerization reaction mixture, or by the inclusion of mono-functional acrylate such as poly(ethylene glycol) methyl ether acrylate [PEGMEA] or poly(ethylene glycol) acrylate [PEGA]. Copolymerization with mono-functional acrylate led to the insertion of flexible branches along the network backbone, and the corresponding glass-rubber relaxation properties of the copolymers (i.e., Tg, relaxation breadth, fragility) were a sensitive function of network architecture and corresponding fractional free volume. Relatively subtle variations in network structure led to significant differences in relaxation characteristics, and a systematic series of studies was undertaken to examine the influence of branch length, branch end-group, and crosslinker flexibility on viscoelastic response. Dielectric spectroscopy was especially useful for the elucidation of localized, sub-glass relaxations in the polymer networks: the imposition of local constraint in the vicinity of the crosslink junctions led to the detection of a distinctive fast relaxation process in the networks that was similar to a comparable sub-glass relaxation observed in crystalline PEO and in the confined regions of PEO nanocomposites. Gas permeation studies on the model PEGDA networks confirmed their utility as highly-permeable, reverse-selective membrane materials, and strategic control of the network architecture could be used to optimize gas separation performance. Dynamic mechanical and dielectric measurements have also been performed on a semicrystalline polyester, poly(trimethylene terephthalate) [PTT], in order to assess the influence of processing history on the resultant morphology and corresponding viscoelastic relaxation characteristics. Studies on both quenched and annealed PTT revealed the presence of a substantial fraction of rigid amorphous phase (RAP) material in the crystalline samples: dielectric measurements showed a strong increase in relaxation intensity above the glass transition indicating a progressive mobilization of the rigid amorphous phase with increasing temperature prior to crystalline melting.

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Yoshikawa, Katsuyuki. "STUDIES ON NONLINEAR VISCOELASTIC BEHAVIOR OF HIGHLY ENTANGLED POLYMER SYSTEMS". Kyoto University, 2020. http://hdl.handle.net/2433/252988.

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Kamath, Vinod Mangalore. "The modelling of viscoelastic behaviour for mono- and polydisperse polymer melts". Thesis, University of Cambridge, 1990. https://www.repository.cam.ac.uk/handle/1810/272959.

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Yang, Guanwen Zhu Da-Ming. "Probing the viscoelastic response of polymer films using atomic force microscopy". Diss., UMK access, 2005.

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Thesis (M.S.)--Dept. of Physics. University of Missouri--Kansas City, 2005.
"A thesis in physics." Typescript. Advisor: Da-Ming Zhu. Vita. Title from "catalog record" of the print edition Description based on contents viewed June 27, 2006. Includes bibliographical references (leaves 50-52). Online version of the print edition.

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Książki na temat "VISCOELASTIC POLYMER"

Sadeghy-Dalivand, Kayvan. Viscoelastic behaviour of associative polymer solutions. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1996.

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Nijenhuis, K. te. Thermoreversible networks: Viscoelastic properties and structure of gels. Berlin: Springer, 1997.

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Nijenhuis, K. te. Thermoreversible networks: Viscoelastic properties and structure of gels. Berlin: Springer, 1996.

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Leonov, A. I., i A. N. Prokunin. Nonlinear Phenomena in Flows of Viscoelastic Polymer Fluids. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1258-1.

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Leonov, A. I. Nonlinear Phenomena in Flows of Viscoelastic Polymer Fluids. Dordrecht: Springer Netherlands, 1994.

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Leonov, A. I. Nonlinear phenomena in flows of viscoelastic polymer fluids. London: Chapman & Hall, 1994.

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Djunisbekov, T. M. Stress relaxation in viscoelastic materials. Enfield, NH: Science Publishers, 2003.

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Tervoort, Theodorus Anthonius. Constitutive modelling of polymer glasses: Finite, nonlinear viscoelastic behaviour of polycarbonate. Eindhoven: Eindhoven University of Technology, 1996.

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C, Malarik Diane, Robaidek Jerrold O i United States. National Aeronautics and Space Administration., red. Viscoelastic properties of addition-cured polyimides used in high temperature polymer matrix composites. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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Viscoelastic behavior of rubbery materials. Oxford: Oxford University Press, 2011.

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Części książek na temat "VISCOELASTIC POLYMER"

Archodoulaki, V. M., i S. Seidler. "Viscoelastic Properties - application". W Polymer Solids and Polymer Melts–Mechanical and Thermomechanical Properties of Polymers, 51–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55166-6_10.

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Archodoulaki, V. M., i S. Seidler. "Viscoelastic Properties - data". W Polymer Solids and Polymer Melts–Mechanical and Thermomechanical Properties of Polymers, 54–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55166-6_11.

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Archodoulaki, V. M., i S. Seidler. "Viscoelastic Properties - introduction". W Polymer Solids and Polymer Melts–Mechanical and Thermomechanical Properties of Polymers, 49–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55166-6_9.

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Gupta, B. R., i B. R. Gupta. "Viscoelastic Behaviour". W Rheology Applied in Polymer Processing, 203–71. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003344971-6.

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Realinho, Vera, Marcelo Antunes, David Arencón i José I. Velasco. "Mechanical-Viscoelastic Characterization in Nanocomposites". W Polymer Composites, 117–46. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527652372.ch5.

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Shenoy, Aroon V. "Unsteady shear viscoelastic properties". W Rheology of Filled Polymer Systems, 338–94. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9213-0_8.

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Maurer, F. H. J. "Interphase Effects on Viscoelastic Properties of Polymer Composites". W Polymer Composites, redaktor Blahoslav Sedlácek, 399–412. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110856934-036.

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Legat, V. "Computer Modeling of Viscoelastic Flow". W Rheological Fundamentals of Polymer Processing, 209–29. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8571-2_10.

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Goswami, Sudipta. "Viscoelastic Properties of Interpenetrating Polymer Networks". W Micro- and Nano-structured Interpenetrating Polymer Networks, 229–58. Hoboken, NJ: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781119138945.ch9.

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McKenna, Gregory, i Meiyu Zhai. "Mechanical and viscoelastic properties of polymer thin films and surfaces". W Polymer Glasses, 205–42. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315305158-9.

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Streszczenia konferencji na temat "VISCOELASTIC POLYMER"

Zeynalli, Mursal, Emad W. Al-Shalabi i Waleed AlAmeri. "Core-to-Field-Scale Simulations of Polymer Viscoelastic Effect on Oil Recovery Using the Extended Viscoelastic Model". W Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208168-ms.

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Abstract Being one of the most commonly used chemical EOR methods, polymer flooding can substantially improve both macroscopic and microscopic recovery efficiencies by sweeping bypassed oil and mobilizing residual oil, respectively. However, a proper estimation of incremental oil to polymer flooding requires an accurate prediction of the complex rheological response of polymers. In this paper, a novel viscoelastic model that comprehensively analyzes the polymer rheology in porous media is used in a reservoir simulator to predict the recovery efficiency to polymer flooding at both core- and field-scales. The extended viscoelastic model can capture polymer Newtonian and non-Newtonian behavior, as well as mechanical degradation that may take place at ultimate shear rates. The rheological model was implemented in an open- source reservoir simulator. In addition, the effect of polymer viscoelasticity on displacement efficiency was also captured through trapping number. The calculation of trapping number and corresponding residual-phase saturation was verified against a commercial simulator. Core-scale tertiary polymer flooding predictions revealed the positive effect of injection rate and polymer concentration on oil displacement efficiency. It was found that high polymer concentration (>2000 ppm) is needed to displace residual oil at reservoir rate as opposed to near injector well rate. On the other hand, field-scale predictions of polymer flooding were performed in a quarter 5-spot well pattern, using rock and fluid properties representing the Middle East carbonate reservoirs. The field-simulation studies showed that tertiary polymer flooding might improve both volumetric sweep efficiency and displacement efficiency. For this case study, incremental oil recovery by polymer flooding is estimated at around 11 %OOIP, which includes about 4 %OOIP residual oil mobilized by viscoelastic polymers. Furthermore, the effect of different parameters on the polymer flooding efficiency was investigated through sensitivity analysis. This study provides more insight into the robustness of the extended viscoelastic model as well as its effect on polymer injectivity and related oil recovery at both core- and field-scales. The proposed polymer viscoelastic model can be easily implemented into any commercial reservoir simulator for representative field-scale predictions of polymer flooding.

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Zeynalli, Mursal, Umar Alfazazi, Muhamad Mushtaq, Emad W. Al-Shalabi i Waleed AlAmeri. "Recent Advancements in Viscoelastic Polymer Flooding EOR Applications in Carbonates and Sandstones". W ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211481-ms.

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Abstract Polymer flooding is a well-established chemical enhanced oil recovery (CEOR) technique that effectively improves oil recovery after waterflooding. Due to a large number of studies conducted in this area and extensive field data availability, this technique has gained solid practical and theoretical knowledge. Conventionally, the polymer injection is believed to increase volumetric sweep efficiency by producing movable oil that is remained unswept after waterflooding. Nevertheless, studies demonstrated that specific viscoelastic polymers might also mobilize residual oil and improve microscopic displacement efficiency, in addition to macroscopic sweep efficiency. Although polymer flooding is an extensively applied CEOR technique in sandstones, its applicability in carbonates is still limited. This is related to the prevailing complicated conditions in carbonates including mixed-to-oil wettability nature, high heterogeneity with low permeability, and harsh conditions of high temperatures (above 85°C), high salinity (above 100,000 ppm), and high hardness (above 1,000 ppm). Recently, new polymers have been developed to overcome the challenges of harsh conditions in carbonates. These novel polymers incorporate specific monomers that protect the polymer from thermal and chemical degradations. However, the viscoelasticity of these synthetic polymers and their effect on oil mobilization are not yet comprehended and requires further investigation and research. In this paper, we review the recent studies conducted on viscoelastic polymer flooding in sandstones and carbonates. The article describes viscoelastic polymer recovery mechanisms, polymer viscoelastic properties and the factors controlling them, and the effect of viscoelastic polymers on residual oil mobilization. This study also provides insights into the challenges faced during viscoelastic polymer flooding operations as well as field applications in sandstone and carbonate reservoirs.

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Surý, Alexander, Ivan Machač i Martin Zatloukal. "Cake Filtration in Viscoelastic Polymer Solutions". W NOVEL TRENDS IN RHEOLOGY III: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3203285.

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Li, K., X. L. Gao i A. K. Roy. "Analysis of the Linearly Viscoelastic Behavior of Nanotube-Reinforced Polymer Composites". W ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59988.

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In the last few years a lot of efforts have been made to demonstrate that the addition of carbon nanotubes, even with a small volume fraction, can substantially enhance the stiffness and strength of polymers [1]. Nevertheless, very limited attention has been paid to the viscoelastic responses of nanotube-reinforced polymer composites. Several groups have investigated the changes in glass transition temperatures of polymers induced by adding nanotubes to polymers [2–4]. Fisher [4] also studied the frequency response and the physical aging of polymers with or without nanotubes. However, the creep/stress relaxation behavior of nanotube-reinforced polymer composites is still not well understood. Experimental characterization tends to be configuration specific and expensive. Therefore, there is a need to develop analytical models that can predict the said behavior. The objective of this communication is to present a study on the creep behavior of carbon nanotube-reinforced polymer composites using a continuum-based micromechanics model.

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Rosset, Samuel, Alexandre Poulin, Herbert R. Shea i Iain A. Anderson. "Taming the viscoelastic creep of dielectric elastomer actuators". W Electroactive Polymer Actuators and Devices (EAPAD) XXI, redaktorzy Yoseph Bar-Cohen i Iain A. Anderson. SPIE, 2019. http://dx.doi.org/10.1117/12.2513981.

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Clarke, A., A. M. Howe, J. Mitchell, J. Staniland i L. A. Hawkes. "How Viscoelastic Polymer Flooding Enhances Displacement Efficiency". W SPE Asia Pacific Enhanced Oil Recovery Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174654-ms.

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Zeynalli, Mursal, Emad W. Al-Shalabi i Waleed AlAmeri. "An Extended Viscoelastic Model for Predicting Polymer Apparent Viscosity at Different Shear Rates". W SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206010-ms.

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Abstract Polymer flooding is one of the most commonly used chemical EOR methods. Conventionally, this technique was believed to improve macroscopic sweep efficiency by sweeping only bypassed oil. Nevertheless, recently it has been found that polymers exhibiting viscoelastic behavior in the porous medium can also improve microscopic displacement efficiency resulting in higher additional oil recovery. Therefore, an accurate prediction of the complex rheological response of polymers is crucial to obtain a proper estimation of incremental oil to polymer flooding. In this paper, a novel viscoelastic model is proposed to comprehensively analyze the polymer rheological behavior in porous media. The proposed viscoelastic model is considered an extension of the unified apparent viscosity model provided in the literature and is termed as extended unified viscosity model (E-UVM). The main advantage of the proposed model is its ability to capture the polymer mechanical degradation at ultimate shear rates primarily observed near wellbores. Furthermore, the fitting parameters used in the model were correlated to rock and polymer properties, significantly reducing the need for time-consuming coreflooding tests for future polymer screening works. Moreover, the extended viscoelastic model was implemented in MATLAB Reservoir Simulation Toolbox (MRST) and verified against the original shear model existing in the simulator. It was found that implementing the viscosity model in MRST might be more accurate and practical than the original method. In addition, the comparison between various viscosity models proposed earlier and E-UVM in the reservoir simulator revealed that the latter model could yield more reliable oil recovery predictions since it accommodates the mechanical degradation of polymers. This study presents a novel viscoelastic model that is more comprehensive and representative as opposed to other models in the literature.

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Taya, Minoru, i Kevin Kadooka. "Review on viscoelastic behavior of dielectric polymers and their actuators". W Electroactive Polymer Actuators and Devices (EAPAD) XX, redaktor Yoseph Bar-Cohen. SPIE, 2018. http://dx.doi.org/10.1117/12.2295116.

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Abu Al-Rub, Rashid, i Ardeshir Tehrani. "Thermo-mechanical Viscoelastic, Viscoplastic, and Viscodamage Model for Polymers and Polymer Composites". W 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-2173.

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Yin Hong-jun, Yang Wei-li, Huang Fu-sheng i Zhong Hui-ying. "Dynamic Analysis on Pressure of Viscoelastic Polymer Solution". W 2010 2nd International Symposium on Information Engineering and Electronic Commerce (IEEC). IEEE, 2010. http://dx.doi.org/10.1109/ieec.2010.5533233.

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Raporty organizacyjne na temat "VISCOELASTIC POLYMER"

Brennan, John K., i Jan Andzelm. Viscoelastic Properties of Polymer Systems From Dissipative Particle Dynamics Simulations. Fort Belvoir, VA: Defense Technical Information Center, listopad 2008. http://dx.doi.org/10.21236/ada497555.

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Hong, Seok H., i Wendel J. Shuely. Influence of Trace Components on the Viscoelastic Properties of a Polymer Solution. Fort Belvoir, VA: Defense Technical Information Center, sierpień 1993. http://dx.doi.org/10.21236/ada277171.

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Banks, H. T. A Brief Review of Some Approaches to Hysteresis in Viscoelastic Polymers. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2008. http://dx.doi.org/10.21236/ada477377.

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Clark, S. Nonlinear viscoelastic characteristics of polymeric materials: Final report, September 1, 1986--February 28, 1989. Office of Scientific and Technical Information (OSTI), czerwiec 1989. http://dx.doi.org/10.2172/5998122.

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