Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Free Volume Theory"”.
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Cluster kinetics modeling of glassforming materials
… viscosity or dielectric relaxation time through free volume theory. The resulting equations are tested against data for a variety of pure glassformers, fragile, non-fragile, large, and small molecules over a wide range of temperatures, pressures, and dielectric relaxation times. It is found that …
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Elastomer Degradation in Chemically Reactive Environment under Elevated Temperature and Pressurized Condition
… developed in this study uses the Vrentus-Duda free volume theory to quantify the diffusion between small molecules and macromolecular matrices. Current model allows us to study temperature, pressure, and chemical kinetic effects through the quantification of diffusant concentration profile …
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Transport and damage in hydrated coatings – a model soft active composite material
… interrelated fundamental processes – transport, volume change, stress, and damage – are present in active materials. This thesis explores the interconnection of these processes using water-based anti-corrosion coatings, water-absorbing polymer films composed of coalesced latex particles, as the …
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The effects of molecular orientation on the physical aging behavior of oriented glassy amorphous polymers
… rates were determined as a function of fusing volume and linear dilatometry, mechanical creep measurements, DSC, and tensile properties. The molecular state, including the free volume, of the oriented polymers was quantified using Positron Annihilation Lifetime Spectroscopy (PALS), oxygen …
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Mechanisms of Enhancing Solid Polymer Electrolytes Using Nanofillers and Ionic Liquid for Applications in Flexible Lithium Ion Batteries
… a continuum, bulk level approach. Based on the free volume theory, a model of the ion conductivity enhancement of polymer electrolyte as a function of nanofiller content is proposed. The model could fit to various experimental results of ionic conductivity enhancement and degradation. It could …
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DIFFUSION CONTROLLED VINYL POLYMERIZATION
… concept and the conversion dependence with the free volume theory.</p><p>During the Phase III, the gel effect disappears due to the change of the controlling mechanism of termination from translation diffusion to the excess chain mobility of the chain ends coupled with the propagation reaction. …
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Ion Transport, Viscoelastic, and Thermal Properties of Several Poly(Ethylene Glycol) and Poly(Propylene Glycol) Based Polymer Electrolytes
… modifications were made to vary the fractional free volume of the MePEG polymers. All of the copolymers obeyed the Doolittle equation. For both the bulky copolymers and MePEG/MePPG copolymers, increases in the FFV corresponded to increases in the viscosity and decreases in FFV correspond to …
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Dynamic Modelling and Optimization of Polymerization Processes in Batch and Semi-batch Reactors. Dynamic Modelling and Optimization of Bulk Polymerization of Styrene, Solution Polymerization of MMA and Emulsion Copolymerization of Styrene and MMA in Batch and Semi-batch Reactors using Control Vector Parameterization Techniques.
… as the solvent was improved by including the free volume theory to calculate the initiator efficiency, f. The effects of different f was examined and compared with previous work which used a constant value of f 0.53. The results of these studies show that initiator efficiency, f is not …
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Volumetric Properties and Viscosity of Fluid Mixtures at High Pressures: Lubricants and Ionic Liquids
The present thesis explores the volumetric and transport properties of complex fluid mixtures under pressure in order to develop a better, more holistic understanding of the relationship between the volumetric properties, derived thermodynamic properties, and viscosity. To accomplish this broad …