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Showing 1 to 20 of 30 for “"polymer gels"”.
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Stimuli responsive polymer gels for sensing applications
… imparted on it by an IL. The IL simplified polymer gel is termed an optode within this chapter as (a) it is prepared the same manner as optodes, (b) the IL performs many of the same functions as previous materials used in optode design and (c) the analyte or ion movement between the aqueous …
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Structure-property relationships in physical polymer gels
Associating polymer networks are included in a large number of materials where it is important to control and tune the rheological response of the material, particularly including responses to temperature, shear, or changes in the surrounding environment. Knowledge of the relationship between the …
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Mechanics of amorphous polymers and polymer gels
Many applications of amorphous polymers require a thermo-mechanically coupled large-deformation elasto-viscoplasticity theory which models the strain rate and temperature dependent response of amorphous polymeric materials in a temperature range which spans the glass transition temperature of the …
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Structure and Dynamics of Associative Polymer Gels
Associative polymers have attracted wide attention for applications spanning biomedicine, soft robotics, and rheological modification due to their unique viscoelastic and stimuli-responsive properties imparted by their dynamic bonds. However, predicting the response of associative polymer networks …
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Structure and critical behavior of polymer gels
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Molecular imprinting and ionic crossliking in polymer gels
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1995.
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Light scattering studies of phase transition in polymer gels
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Polymer Gels: Kinetics, Dynamics Studies and Their Applications as Biomaterials
The polymer gels especially hydrogels have a very special structure and useful features such as unusual volume phase transition, compatibility with biological systems, and sensitivity to environmental stimuli (temperature, pH value, electric field, light and more), which lead to many potential …
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Synthesis, Characterization, and Theory of Polymer Gels to Elucidate Topology-Property Relationships
Crosslinked polymer networks and gels are pervasive in daily life, with applications ranging from tires to contact lenses to precision drug delivery. For any application, it is desirable to engineer the material based on fundamental principles and predictive theories a priori to synthesis or …
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Screening guidelines and data analysis for the application of in-situ polymer gels for injection well conformance improvement
… its serious economic and environmental impacts. Polymer gels have been effectively applied to mitigate water production and extend the productive lives of mature oilfields. However, selecting a proper gel technology for a given reservoir is a challenging task for reservoir engineers because of …
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HIGH MODULI POLYMER GELS AND NON-AQUEOUS ELECTROLYTES WITH MUTLI-IONIC LITHIUM SALTS HAVING HIGH THERMAL STABILITY AND LITHIUM ION TRANSFERENCE NUMBERS
… mechanical strength. To that extent high moduli polymer gel electrolytes with high thermal stability were developed by in-situ encapsulation of ionic liquids and solvate ionic liquids into nanofibrillar methyl cellulose networks. The separators/iongels prepared possessed good room temperature …
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Characterization of PVA-Borax-fructose gel for the capture of radioactive wastes generated during nuclear decommissioning activities
With the long-term objective of using polymer gels for the capture of solid, liquid and gaseous waste generated from decommissioning works, characterization of gel properties as well as the properties of the individual constituents of polymer gels has been completed. Characteristics of constituents …
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Nanostructured carbon-based materials for electrochemical applications
… by carbonization of resorcinol formaldehyde (RF) polymer gels; using poly-diallyl methylammonium chloride and SiO2 (~200 nm diameter) as soft- and hard-template, respectively, to tailor the textural properties of the carbon products. Accelerated ageing tests on platinized samples prepared with …
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Materials and coatings derived from the polymerizable ionic liquid surfactants 1-(2-acryloyloxyundecyl)-3-methylimidazolium tetrafluoroborate and 1-(2-acryloyloxyundecyl)-3-methylimidazolium 2-acrylamido-2-methyl-propylsulfonate
<p>Polymerizable ionic liquid surfactants were synthesized and polymerized, yielding engineered advanced polymers that can be tailored for diverse applications. First, 1-(2-acryloyloxyundecyl)-3-methylimidazolium tetrafluoroborate (IL-BF<sub>4</sub>) was synthesized and was copolymerized with …
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Perturbation studies of excitable media
… systems are probably the most often studied polymer gels due to their dramatic change in volume, swelling and deswelling. Since this system has the best response to pH between 4 and 7, the ferrocyanide-iodate-sulfite (FIS) reaction, which exhibits pH oscillations between 4 and 7.5 in a …
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Computational Design of Viscoelastic Gels with Tunable Mechanical Energy Dissipation
… temperatures has propelled interest in using polymer gel systems that could potentially mimic the mechanical response of tissues. More generally, the capacity to tune the mechanical energy dissipation characteristics of such gels is of interest to a range of applications. The present work uses …
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The Hydrogel Reimagined: Gel-Derived Sponges and Sheets as Absorbents for Water, Blood, and Oil
Polymer hydrogels, i.e., crosslinked networks of polymer chains swollen in water, are well-studied materials. Superabsorbent polymer (SAP) gels that can absorb more than 100x their dry weight in water are widely used in personal hygiene products – but only in the form of microscale beads. If dry …
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Constitutive modeling of active polymers
… a three-dimensional constitutive model of active polymeric materials, including changes in material volume and properties due to actuation. Active polymers reversibly change shape, volume and/or material properties in response to some external stimulus. Electric fields are a common driving force …
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Novel conducive alkaline polymer membranes for fuel cells
… synthesise the membranes proved difficult. Thick polymer gels were observed which could not be used to make any membranes. A membrane was successfully prepared from a "semi gel" batch of CMPPO which showed the highest observed ionic conductivity (IC) whilst being stable at 90 oC. Improvements in …
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Molecular recognition : conformational memory and the macroscopic functional character of heteropolymer gels
… Toyoichi Tanaka of M.I.T. proposed that polymer gels be used as protein 'mimics'. Multi-contact adsorption is engineered as a measure of gel function. Adsorbers within the gel's polymer network cluster to form an active site for molecular capture. A gel's conformation impacts both protein …
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