On rheological properties of polydisperse polymers. These polymers have a complex comblike structure that is a polyelectrolyte backbone, a copolymer of acrylic or methacrylic acid and alkyl. Rheological properties of polydisperse polymers 449 o i 2 eo 4 polymers. This allows the formulation of dispensable adhesives and coatings with tailored rheological properties. A semiempirical method is described to calculate the rheological parameters in ehd contacts by using the traction measurements performed with a tworoller machine. In industrial processes, polymers are usually processed as concentrated solution or melts. Each macromolecule consists of a soluble backbone b and a small fraction of specific strongly interacting groups a or c stickers attached to b. Surveys of rheological properties also play an important role in food industry, where rheology relates with quality control or sensory proper ties yo o, 2004 of foods including honey p o p e k, 2002. Rheological properties of polymers scientific research publishing. Structure and rheological properties of polymers springerlink. Even when a theoretical model of the reason for the behaviour is not known, rheological measurements provide useful insights to practising engineers on how to control the.
Rheological measurements on polymers can reveal the variety of behaviour exhibited even in simple. Rheological evaluation of high temperature polymers to identify successful extrusion parameters christine ajinjeru 1,2, vidya kishore, peng liu 2, ahmed arabi hassen, john lindahl2. Basic polymer rheology, as related to extrusion coating machinery. Properties of drilling fluid know energy solutions. Rheological properties of polyethylene and polypropylene. Rheological properties of polymermodified binders for use in. The primary objective of this article is to ascertain the state of the art regarding the understanding and prediction of the macroscale properties of polymers reinforced with nanometersized solid inclusions over a wide temperature range.
However, the rheological properties of the polymer fluids used in excavation support have not been studied in detail, and there is currently confusion about the choice of mathematical models for this type of fluid. Rheological evaluation of high temperature polymers to. The major aim of the current study is to characterize experimentally the effect of two cationic polymers on the rheological properties of foams, stabilized with surfactants of low and high surface moduli. Furthermore, highpolymer modified asphalt is shown to be applicable to applications such as highly traveled highways, when thinner layers of pavement. As a result of ac association, the polymers reversibly gelate. Rheology is a key characterization technique for developing materials with the desired physical properties and for controlling the manufacturing process in order to ensure product quality. Experimental study of rheological properties and oil. Rheological properties are important in evaluating the processing. Experimental study of rheological properties and oil displacement efficiency in oilfields for a synthetic hydrophobically modified polymer.
This study focuses on understanding the structureproperty relationship for hydrophobically modified alkali soluble emulsion hase polymers with emphasis on their microstructure and rheological properties. Pdf this chapter is devoted to the presentation of the fundamental rheological properties of polymers and their processing technologies. Rheological properties most often refers to the bingham plastic fluid parameters, pv plastic viscosity and yp yield point, as measured by the directindicating rheometer. This chapter is devoted to the presentation of the fundamental rheological properties of polymers and their processing technologies. Measurement and interpretation of rheological properties of foods. Development of this software was supported by the national science foundation under nsf dmr 0604965. Rheological properties of linear polyisoprenes and hydrogenated. Sbcs have been used as dielectric actuators8,9 or as a base for polymerceramic nanocomposites,1012 but measurements of the dielectric properties of these materials. The following rheological properties were described.
Spatially distributed rheological properties in con ned. Rheological and thermomechanical properties of pla. Structure and morphology of molten polymer blends oluranti sadikuagboola, emmauel rotimi sadiku, adesola taoreed adegbola, olusesan frank biotidara department of mechanical engineering, faculty of engineering and the built environment, tshwane university of technology, lynnwoodridge, south africa. Polymer rheology michigan technological university.
Titomanlio1 1 department of chemical and food engineering, university of salerno, fisciano sa, italy 2 department of mechanical engineering, technical university of eindhoven, eindhoven, the netherlands crystallinity and linear rheological properties of polymers the crystallization of a polymer melt, taking place during. Hence, the format of this paper is to intro duce basic terminology. Aug 18, 2017 experimental study of rheological properties and oil displacement efficiency in oilfields for a synthetic hydrophobically modified polymer. The major materials in this group include the polyamides nylons, acetals, polycarbonates. Rheological testing of thermoplastic materials can be carried out on both melts and solid samples. Dec 19, 2006 dynamics of associating polymer solutions above the reversible gelation point are studied. A density specific gravity density is defined as weight per unit volume. The viscosity profile consists of a zeroshear newtonian region at low stresses and a shearthickening region at intermediate stresses, followed by a catastrophic decrease in the viscosity at. To advance the current state of knowledge, a laboratory.
Christianson d prentice 1983 expressed concern with prob lems of assessing the reliability of data obtained on food materials indifferentlaboratories. In this study, the effect of polymer structure, the degree of hydrolysis, chemical structure of monomer in the backbone, and charge distribution of monomer groups on rheological and filtration properties of bentonite bent polymer dispersions were assessed. Similar effects have been reported in literature for polymer glasses 3e6 as well as for semicrystalline polymers 7. Effect of cationic polymers on foam rheological properties. Rheological properties of the polymer melt are of particular. In this investigation, we employ a unique noncontact capillary nanoshearing method to directly probe nanoresolved gradients in the rheological response of ultrathin polymer films. Walters, an introduction to rheology elsevier, 1989 suspension behavior larson, ron, the structure and rheology of complex fluids oxford, 1999.
Measurement and interpretation of rheological properties. Asphalt rheology and strengthening through polymer binders. As it is known that the modification of bitumen by the use of polymers enhances its performance characteristics but at the same. These blends were tested for tensile strength tests to study the mechanical properties of the polymers. Rheological properties of binary associating polymers. Graessley, proceedings of the american chemical society, polymer chemistry division, polymer preprints, v. Structure and morphology of molten polymer blends open access. May 20, 2000 the rheological properties of semidilute hydrophobically modified alkalisoluble emulsion polymers in the presence of 0.
Sample pages helmut munstedt rheological and morphological. Rheological and filtration properties of claypolymer systems. Structure and morphology of molten polymer blends article pdf available in materials sciences and applications 0201 january 2011 with 3,854 reads. Rheological characterization of polymer melts in shear and extension. Solution rheology and microstructure of associative polymers. Polymer behavior larson, ron, the structure and rheology of complex fluids oxford, 1999 ferry, john, viscoelastic properties of polymers wiley, 1980 descriptive rheology barnes, h. The viscosity of filled systems generally increases with increasing filler fraction. Pressure dependence of viscosity of polymers and its importance to. A mixture of ba and bc associating polymers with 1.
Rheological properties of polymermodified binders for use. The viscoelastic properties of linear flexiblechain polymers with a narrow distribution, for which m 5mc mc corresponds to the formation of a three. Viscous properties elastic properties linear viscoelastic properties mainly polymer physics liquid viscosity relaxation time modulus pa. This document is an overview pdf from ppt presentation. Sbcs have been used as dielectric actuators8,9 or as a base for polymerceramic nanocomposites,1012 but measurements of the dielectric properties of these materials have generally been in the subgigahertz regime. Abuabdeen1,2 1physics department, college of science, king faisal university, alhasa, saudi arabia 2physics department, college of science, cairo university, giza, egypt received 15 april 2011. Rheological properties of semidilute hydrophobically. Pdf crystallinity and linear rheological properties of polymers. For example, polymer nanocomposites can attain a substantially.
Rheological behaviour ofsome dilute polymer solutions t. Sample pages helmut munstedt rheological and morphological properties of dispersed polymeric materials filled polymers and polymer blends book isbn. Dynamics of associating polymer solutions above the reversible gelation point are studied. Investigation of the rheological, dynamic mechanical, and. Rheological properties of phpa polymer support fluids. This can be partially ameliorated via broad particle size distributions via the farris effect. The importance of the rheological properties of polymer mixtures in the development. An overview of the basic rheological behavior of polymer fluids with.
For this purpose, nine different polymer blends were selected, with three different percentage combinations for each blend. Paapeo comb polymer effects on rheological properties and interparticle forces in aqueous silica suspensions catherine p. Crystallinity and linear rheological properties of polymers the crystallization of a polymer melt, taking place during transformation processes, has a great impact on the process itself, mainly because it causes a large increase in the viscosity hardening. The determination of rheological and mechanical material properties. Knowledge on rheological behavior of polymers is needed for setting the right process window, such as temperature and flow rate.
Rheological and filtration properties of claypolymer. To achieve comparable or better rheological properties for highrecycled asphalt pavement highpolymer modified asphalt can be used with between 7% and 8% polymer additions. Problems of theoretical and practical interest associated with the particular rheological properties of polymer systems at high deformation rates are defined. Conclusion rheology is capable of evaluating even small changes in polymer structures and hence it is suitable for polymer characterization. Rheological behaviour ofsome dilute polymer solutions. Crystallinity and linear rheological properties of polymers. Experimental results on polymer blends are summarized.
When geometrically confined to the nanometer length scale, a condition in which a large portion of the material is in the nanoscale vicinity of interfaces, polymers can show astonishing changes in physical properties. Investigation of the rheological, dynamic mechanical, and tensile properties of singlewalled carbon nanotubes reinforced polyvinyl chloride m. Measurements of the rheological properties offer a fast and reliable way to determine molecular weight distribution and longchain branching, which. The tribological behaviour was studied from two point of view. Crystallinity and linear rheological properties of polymers article pdf available in international polymer processing journal of the polymer processing society 22. The characteristics of the materials response as function of the following factors. Measurement and interpretation of rheological properties of foods fundamental rheological tests can aid in evaluating the properties of complex foods e. Secondly, it is the rheological properties that govern the flow behaviour of polymers when they are processed in the molten state. Additionally, partially curing or bstaging allows for unique processing of preapplied coatings or composite structures using specially designed prepregs. Alzahranl departmentofchemical engineering, faculty ofengineering, king saud university, riyadh, saudi arabia abstract rheological characteristics of dilute aqueous solutions of three types ofcommercial polymer were investigated using a rotational vis cometer. Cure characterization of thermosetting polymers by. Abuabdeen1,2 1physics department, college of science, king faisal university, alhasa, saudi arabia.
Spatially distributed rheological properties in confined. The research supports the concept of either specifying or designing rolled asphalt mixtures for deformation resistance from properties of the binder for a given aggregate skeleton. It is expressed either in ppg lbs gallons or pound per cubic feet lbft3 or kgm3 or gmcm3 or compared to the weight of an equal volume of water as specific gravity. Ehd filmforming properties in a rolling bearing and scuffing resistance on fourball machine. Paapeo comb polymer effects on rheological properties and. Issues related to process ability can be correlated with polymer melt properties, or problems regarding product performance are often related to the properties of solid samples. The rheological properties of semidilute hydrophobically modified alkalisoluble emulsion polymers in the presence of 0. The rheological properties of filled polymers are determined not only by the type and amount of filler, but also by the shape, size and size distribution of its particles. Rheological properties of semidilute hydrophobically modified. Engineering plastics are a group of polymers that offer a combination of properties including superior strength, stiffness, toughness and resistance to wear, resistance to chemical attack and heat resistance. The paper deals with rheological properties of three kinds of honey originating from the czech republic. Rheological evaluation of high temperature polymers to identify successful extrusion parameters christine ajinjeru 1,2, vidya kishore, peng liu 2, ahmed arabi hassen, john lindahl2, vlastimil kunc1,2,3, chad duty1,2 1university of tennessee, knoxville 2manufacturing demonstration facility, oak ridge national laboratory 3purdue university abstract with the advancements in additive. The powerlaw fluid model parameters, exponent n and consistency k, apply to polymer muds, although the three parameter herschelbulkley model is a better fit to.