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 11 of 11 for “"solution rheology"”.
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Effects of formulation conditions on micellar interactions and solution rheology in multi-component micellar systems
… viscosity are controlled through chemistry and solution conditions. An experimental study was conducted to determine how variations in solution chemistry (surfactant headgroup and blend stoichiometry) and solution conditions (pH and [NaCl]: [anionic + zwitterionic surfactant] ratio) affect the …
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Responsive polymers for dynamic modulation of bio-macromolecular transport properties
… trigger to change the properties of a polymer solution because it enables structural transitions to be induced under isothermal conditions without the addition of other chemical species to the solution, and is externally reversible and hence amenable to device design and automation. Amphiphilic …
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Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams
… shows that sPI/sPAA formulations perform well. Solution rheology offers insights into fundamental scaling relationships of specific viscosity vs. concentration in both salt and salt-free solution that are important to future foam development. Additionally, the structural nature of the sPIs/ …
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Nuclear magnetic resonance and rheo-NMR investigations of wormlike micelles, rheology modifiers, and ion-conducting polymers
… techniques, with the addition of "rheo-NMR" and solution rheology measurements, to study the complex rheological behavior of cetyltrimethylammonium bromide wormlike micelle solutions, which behave as nematic liquid crystals at sufficiently high concentration. Amphiphilic solutions of this type …
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Influence of Electrostatic and Intermolecular Interactions on the Solution Behavior and Electrospinning of Functional Nanofibers
The solution rheological and electrospinning behavior of a series of charge-containing polymers, surface-active agents, and carbon nanotube composites was studied to investigate the effect of intermolecular interactions, including electrostatic interactions, hydrogen bonding, surface activity, and …
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Effects of Functionality and Charge in the Design of Acrylic Polymers
… Electrospinning from chloroform/ethanol solutions (80/20 v/v) at 2-7 wt % afforded polymeric fibers at viscosities below 0.02 Pa™s, which is the lowest viscosity observed for fiber formation in our laboratories. We hypothesized that intermolecular interactions rather than chain …
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The Influence of Branching and Intermolecular Interactions on the Formation of Electrospun Fibers
… Empirical correlations were developed based on solution rheological measurements that predict the onset of electrospun fiber formation and average fiber diameter. In particular, for neutral, non-associating polymer solutions, the minimum concentration required for fiber formation was the …
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Synthesis and Properties of Ion-Containing Block and Segmented Copolymers and Their Composites
… of imidazolium counter cation structures on solution rheology, morphology, and thermal and mechanical properties. Combination of living anionic polymerization and post functionalization strategies provided well-defined sulfonated pentablock copolymers containing structured imidazolium cations …
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Blood clotting inspired polymer physics
… transition and its ramifications in dilute-solution rheology. The implications of this behavior and its relation to the current literature provides qualitative explanations for the physiological process of vasoconstriction. In an effort to generalize these observations, we present an entire …
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Processing-Structure-Property Studies of: I) Submicron Polymeric Fibers Produced By Electrospinning and II) Films Of Linear Low Density Polyethylenes As Influenced By The Short Chain Branch Length In Copolymers Of Ethylene/1-Butene, Ethylene/1-Hexene & Ethylene/1-Octene Synthesized By A Single Site Metallocene Catalyst
… fiber spinning processes based on melt and solution spinning. As a result, the electrospun fibers have a very high specific surface. The research efforts discussed in Part I of this dissertation relate to some fundamental as well as more applied investigations involving electrospinning. …
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The dynamics of polymer solutions: Effects of concentration, chain architecture, and flow
The dynamics and rheology of polymer solutions are crucial to understanding and designing a broad range of polymer processing applications and biological systems. The microscopic conformational dynamics of polymers are directly related to the rheological response of solutions in processing flows. …