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 20 of 62 for “"Polymer structure"”.
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Growth behavior of fibroblasts influenced by small changes in polymer structure
Polymers are a promising class of biomaterials that can be engineered to meet specific end use requirements. The order and processing history of the polymer, which would alter the molecular orientation of the material could have a significant contribution towards cellular attachment and in turn, …
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Polymer Structure and Dynamics in Nano-Confinements: Polymer Nanocomposiets and Cylindrical Confinement
Polymers have been used for variety of products for decades, and the usage of polymer products is still growing. Innovative methods (e.g. adding other materials) have been created to improve properties of polymer products to fulfill targeted requirements for applications and many of these …
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Using narrowband pulse-shaping to characterize polymer structure and dynamics : Deathstar GHz spectroscopy
… of this technique for probing amorphous polymer structure and dynamics lays the ground for further study of heterogeneous materials, such as nanocomposites and block copolymers.
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Polymer structure and property studies in elongational rheology, spherulite deformation, and biaxial strain induced crystallization
… concept of a molecular network and incorporates polymer chain entanglement disruption and regeneration. Direct observations of polymeric semicrystalline morphologies in a copolyester by scanning electron microscopy were made possible by the development of a novel chemical etch. Spherulitic …
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Mechanisms of Cytotoxicity and Intracellular Trafficking for Gene Delivery Polymers
Herein, different polymer libraries were examined to determine the effect polymer structure has on intracellular events. The effect of different polyamine lengths in copolymers on cellular uptake, the effect of modifying end groups of trehalose-containing polymers on transfection efficiency, and …
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Synthesis and characterization of bis-MPA based branched polymers with thymine core
… Thymine derivative was incorporated into the polymer structure as a core moiety and an active centre for H-bonding. The formation of assemblies was investigated.
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The Engineering and Development of pH-Responsive Biopolymers for Drug Delivery Applications
… describes experimental studies to understand the structure of biocompatible pH responsive polymers and their interaction with the biological system in order to design more effective entities for biomedical applications. A systemic approach was used to study the structure and biological interaction …
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Directing Polymer-Metal Binding Interactions by Modifying Polymer and Solvation Structure
… quantities of organic solvents. Metal-chelating polymers are a promising class of materials to improve or supplant these existing technologies due to their low cost and high tuneability. Much research has focused on designing specific ligands to bind REEs selectively and occasionally attaching …
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Molecular Design of Crosslinked Copolymers
… molecular design (CMD) of crosslinked polymers is developed and implemented. The methodology is applied to the design of novel polymers for restorative dental materials. The computational molecular design of crosslinked polymers using optimization techniques is a new area of research. …
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Ultrasound Mediated Synthesis of Catalytic and Polymeric Materials
Polymer to diamond-like carbon. Synthesis of a carbon-based network polymer with an sp3 hybridized backbone which upon pyrolysis should yield a diamond-like carbon film. The rational design of an appropriate organic monomer and its polymerization to a network polymer whose weakest bond is between …
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Biodegradation studies of polyether polyurethane in a landfill site
… which are the main constituents of the polymer structure, are well known for theirstability and resistance to hydrolysis.t 32 These groups give to the foam its high hydrophobic property. This research work presents an evaluation of polyether polyurethane biodegradation based on a field …
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Developing Materials for Rare-Earth–Element Chelation: Synthesis, Solution Thermodynamics, and Applications
… are in ever-increasing demand. Metal-chelating polymers have great potential in these applications due to their relatively low cost and high affinity for target elements. However, while much research has focused on specific ligands attached to polymers, little is known about the effect of …
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Poly(phenylene ethynylene)s in biosensor applications
Conjugated polymers have shown remarkable sensitivity for the detection of a variety of analytes, ranging from explosives to biological molecules such as DNA. This thesis presents three new applications of poly(phenylene ethynylene)s (PPEs) in biosensing applications. Biotinylated PPEs were …
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ENHANCING POLYMER INFORMATICS: A STUDY ON THE IMPACT OF FINGERPRINTING METHODS AND MACHINE LEARNING MODELS
… design and selection require accurate polymerproperty prediction. This study will evaluate machine learning model performance prediction accuracy using single-task and multi-task learning methods. We examined eight polymer properties and added polymer genome (PG) fingerprints to Morgan …
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Morphology and Conformation of Polythiophene Derivatives in Anisotropic Core-Shell Nanocomposites and Solution
<p>Conjugated semiconducting polymers have garnered substantial interest in recent years due to the potential for use in various applications, particularly in the field of electronic devices such as photovoltaic cells and light emitting diodes. Conjugated polymers offer numerous advantages in these …
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Multiscale Tortuous Diffusion in Anion- and Cation-Exchange Membranes: Exploration of Counterions, Water Content, and Polymer Functionality
… is critical for improving ion conductivity in polymer electrolyte membranes (PEMs). Herein, we present comprehensive water transport measurements comparing anion-exchange membranes (AEMs) based on ammonium-functionalized poly(phenylene oxide) and cation-exchange membranes (CEMs) based on …
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A Systematic Study of Sialic-Acid-Containing Poly(styrene sulfonate) for Antiviral Applications
… synthetic platform for constructing functional copolymers using post-polymerization modification (PPM) of activated esters. By decoupling the synthesis of the polymer backbone from the introduction of functional groups, this strategy enables precise and efficient tuning of key polymer features …
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Functional Polymer Composites for Clinical and Engineering Challenges
… presents the design and development of novel polymers engineered to outperform widely used commercial materials across a range of demanding applications. The central theme of this work is the deliberate tuning of polymer structure, identity, and architecture to achieve targeted functional and …
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DEGRADATION OF PROTECTIVE GLOVE MATERIALS EXPOSED TO COMMERCIAL PRODUCTS: A COMPARATIVE STUDY OF TENSILE STRENGTH AND GRAVIMETRIC ANALYSES
… study offers a solution by testing five durable polymer materials against 50 chemicals, using two rapid chemical degradation assessment techniques. The first technique involves gravimetric analysis of the weight change following constant immersion against the chemical mixture. The second method …
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