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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 20 of 215 for “"Polymer chains"”.
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The Configurational Statistics of Confined Polymer Chains
Made available in DSpace on 2014-12-14T16:00:40Z (GMT). No. of bitstreams: 1 7913533.pdf: 5580062 bytes, checksum: 9ca1183deb3bb76e7b4c1eedc4deceed (MD5) Previous issue date: 1978
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The elastic behavior of polymer chains: theory and simulations
… a picture on the thermo-elastic behavior of polymer molecules with biological relevance. In particular, this essay deals with the thermo-elasticity of single polymer molecules subjected to uniform stretching (generated by an applied force) or non-uniform stretching (generated by an external …
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Synthesis of DMAP tethered polymer chains for reversible micelle formation
… Thus, the goal of my research is to use RAFT polymerization methods to synthesize a hydrophobic polymer chain bearing 4-methylaminopyridine units and to attach it to a hydrophilic polymer chain to create a polymer system capable of micelle formation in solution. These functionalized micelles …
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Field-driven dynamics of dilute gases, viscous liquids and polymer chains
… arising in dilute gases, viscous liquids and polymer chains. The problems considered herein pertain to the slip-induced motion of a rigid, spherical or nonspherical particle in a fluid in the presence of an inhomogeneous temperature or concentration field or an electric field, and the dynamics …
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Morphological study of composite latex particles and water interaction with polymer chains
… was the morphological study of composite polymer (2 or more) nano-particles in an aqueous dispersed system. This included synthesis, characterization and mathematical/numerical modeling. For a composite latex particle, the morphology can play an important role in determining the final …
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Mechanical and optical characterization of force induced chemical reactions in solid state linear polymers
… chemical species (mechanophores) into polymer backbones, mechanical force can drive chemical reactions. Mechanophores have been developed with potential as damage sensing, self-healing, and self-reinforcing materials. This research investigates the conditions for promoting mechanophore …
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Characterization of Spin Coated Polymers in Nano-environments as a Function of Film Thickness
Polymer applications have become more demanding as industry continuously turns to more microscopic parts. Due to the interactions of the polymer chains with the supporting surface and the air interface, the thinner films required for such applications have distinctly different properties than those …
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Single stranded DNA: A new model system for single molecule polymer dynamics
The study of polymer dynamics has been an active area of research for many years. For nearly two decades, fluorescently-labeled double stranded DNA (dsDNA) has been the model system for studying single molecule polymer dynamics in non-equilibrium conditions. However, dsDNA is a semiflexible polymer …
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Dynamics and mechanics of associating polymer networks
Associating polymers have attracted much interest in a variety of applications such as selfhealing materials, biomaterials, rheological modifiers, and actuators. The interplay of polymer topology and sticker chemistry presents significant challenges in understanding the physics of associating …
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Stereochemical Effect of RAFT Agents on Kinetics of Reversible Deactivation Radical Polymerization
The propagation polymer chains in RDRP can be isolated in the dormant form and be re-activated at chain ends to generate propagating radicals, which initiate subsequent chain extensions. Since the effect of remote substituents on kinetics decreases rapidly with their distance from the reaction site …
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Single wall carbon nanotubes as viscosity modifiers in polypropylene matrix nanocomposites
… viscosity when nanotubes were added into the polymer melt, this work focused on modifying the sidewall profile of the SWNTs and manipulating their configuration in the polymer matrix before subjecting them to rheological testing. Fluorinated single-walled nanotubes (F-SWNTs) played a critical …
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Structure and Property of Polymers and Biopolymers from Molecular Dynamic Simulations
<p>Natural and synthetic polymers and biopolymers have been studied for a variety of applications in food emulsion, biopharmaceutical purification, tissue engineering, and biosensor. The structure and property of polymers and biopolymers are critically important to determine their functions. …
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PVC stabilisers based on metal carboxylates
… as a consequence of mechanical shearing of the polymer chains during the processing operation. The concentration of these species in the polymer before processing is negligible compared with that produced mechano-chemically during processing. It is considered that shearing of PVC during …
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Chemical Studies of Coulombic Complexations in Polymers
… produced from coulombic interaction between a polymer and a monomeric ion (monoion) as well as between two polyions. For the polymer-monoion complexation, a poly(crown ether) (PCE), is studied in the form of an ion-doped polymer. The experimental work was aimed at understanding the significant …
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Polymer and sphere diffusion in confinement
… the diffusion of both colloidal spheres and polymers in slit microchannels. The molecules are allowed to sample the entire height of the microchannel. We find that the sphere data agrees well with a gap-averaged Oseen linear superposition approximation even at very high confinement whereas …
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Single molecule studies of flexible polymer systems
Polymeric materials play a profound role in our daily lives. There have been many key advances in polymer processing over the last several decades, but much of the underlying molecular behavior and physics of polymer solutions is not fully understood. Single molecule studies of polymer solutions …
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Sub-Tg̳, solid-state, plasticity-induced bonding of polymeric films and continuous forming
If two pieces of a glassy polymer are brought into intimate contact (within molecular proximity) at temperatures well below their glass transition temperature (Tg) negligible adhesion, due to lack of inter-diffusion of macromolecules, will be noted. Because polymer chains are kinetically trapped …
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Smart magnetic affinity adsorbents
… this work, modification of M-PVA supports with polymer brushes of dual properties has been explored for their intended use in bioseparation technology, i.e. for both selectively protein binding and enhanced temperature elution of especially difficult to elute species such as haemoglobin. …
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Degradation and stabilisation of diisocyanate cured polybutadiene
… due to the deterioration of the polybutadiene chains. As a result, the propellant can not stand the service loads, which may lead to a catastrophe. The study of the HTPB binder degradation, below 80°C, has been carried out by investigating the environmental factors and the changes which occur …
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