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 88 for “"Polymer Network"”.
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Controlling polymer network topology
Chapter 1: Introduction to Polymer Network Topology on a (Macro)Molecular Level Polymer network topology, comprising the ways in which strands and junctions are connected in polymer networks, plays a critical role in dictating many material properties. Here we discuss classical challenges in the …
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Computational modelling of polymer network formation
… of methods for the computational simulation of polymerisation processes. This thesis provides an overview of these methods, and establishes a connection between them on a theoretical level, based on the First Shell Substitution Effect (FSSE) model of polymerisation. The FSSE framework was used …
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Ion transport and viscoelasticity of dynamic polymer network electrolytes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Thermally-responsive interpenetrating polymer network nanoparticles as intelligent therapeutic systems
Thermally-responsive interpenetrating polymer network (IPN) nanoparticles, composed of polyacrylamide, poly(acrylic acid), poly(methacrylic acid), poly(2-ethylacrylic acid), and poly(2-propylacrylic acid), were synthesized using a sequential inverse emulsion polymerization technique. These …
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Characterization of the Viscoelastic Fracture of Solvated Semi-Interpenetrating Polymer Network Silicone Hydrogels
… behavior of two solvated semi-interpenetrating polymer network silicone hydrogel systems. Viscoelastic characterization of these material systems was performed by implementing a series of uniaxial tension and dynamic mechanical analysis shear tests in order to generate relevant master curves and …
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Photo-Curing Behavior and Thermal Properties of Silicone Semi Interpenetrating Polymer Network (Semi-IPN) Organogels
… properties of silicone semi-interpenetrating polymer network organogels. Curing time may affect the extent of reaction and the crosslink density of a gel network. In order to investigate the effect of this parameter, materials were photo-cured for different times within the range of 150s to …
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Control and Prediction of Polymer Network Structure and Connectivity for Sustainability, Stimuli-Response, and Catalytic Function
Polymer networks find broad application in human life because of their robustness, diverse properties, and economical production. The functions of polymer networks depend on their physical properties, which are dictated at microscopic levels by their chemical structure and connectivity. Engineers …
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A study of monomer liquid mixtures and polymer network formation at a solid surface using molecular dynamics
… and durability. However, the structure of the polymer matrix near the fibre interface is not well understood and difficult to characterise experimentally. The aim of this project is to use molecular dynamics (MD) simulations to elucidate the effect of a fibre on polymer network structure.The …
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Characterization of the Interfacial Fracture of Solvated Semi-Interpenetrating Polymer Network (S-IPN) Silicone Hydrogels with a Cyclo-Olefin Polymer (COP)
… two different solvated semi-interpenetrating polymer network (S-IPN) silicone hydrogels and a cyclo-olefin (COP) polymer through experimental, analytical, and numerical methods. Interfacial fracture data was collected through the application of the wedge test, a relatively simple test allowing …
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Fast Response Liquid Crystal Devices
… examples, using dual-frequency liquid crystals, polymer stabilized liquid crystals, and sheared polymer network liquid crystals. We discover a new class of material, denoted as sheared polymer network liquid crystal (SPNLC) which exhibits a submillisecond response time. First, dual-frequency …
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Synthesis of biodegradable hydrogel microparticles for vaccine protein delivery
… created by Jain et al., which consists of a polymer network surrounding and trapping a protein, by removing the non-degradable crosslinker used in the original particle design and replacing it with a poly (ethylene glycol) acrylate molecule attached to ovalbumin protein. When a dendritic cell …
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Transport and segmental relaxation in polymer networks
Transport phenomena and mechanical properties of polymer networks play a pivotal role in enabling advanced material applications, including energy storage, ion separation, and polymer recycling. This thesis explores the transport mechanisms of ions and penetrants in polymer networks and the …
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The Influence of Extended Cure on Mechanical Performance of Aerospace-Grade Film Adhesives
… of the adhesives as a result of a more developed polymer network. V-notch shear and flat-wise tensile testing at ambient dry and elevated temperature wet conditions were used to mechanically characterize the performance of the adhesives cured with three different cure cycles. Mechanical test …
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Aging processes in complex systems
… a logarithmic growth law, and a non-equilibrium polymer network that is supposed to capture important properties of the cytoskeleton of living cells. For the reaction diffusion systems, our study focuses on systems with reversible reaction diffusion and we study two-times functions in systems …
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Lattice Statistics Of Polymer Adsorption
The interaction of branched polymers with an adsorption surface is studied using rigorous and numerical methods. For a polymer network with a fixed topology and consisting of self-avoiding chains, we prove that the reduced free energy is the same as that for self-avoiding walks interacting with a …
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Designing dynamic mechanics in self-healing nanocomposite hydrogels
… extensive efforts have been made to design polymer networks with transient crosslinks, which lays the foundation for synthetic self-healing hydrogels. Towards the development of stronger and faster self-healing hydrogels, understanding and controlling the gel network dynamics is of critical …
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The synthesis of liquid crystalline materials for organic semiconductor device applications
… synthesised. These materials incorporate photo-polymerisable (non-conjugated diene and methacrylate) and chemically-polymerisable (oxetane) end-groups, attached by aliphatic spacer units of varying length to an aromatic core. These photo- and chemically-polymerisable end-groups are situated at …
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Electrochemistry of Polyaniline-DNA System.
… the polyaniline and the poly-o-phenylenediamine) networks, respectively. DNA also serves as a template to guide the surface synthesis of the oxidative polymerization. It provides a lower local pH environment that favors the protonation of aniline monomers, and subsequently minimizes the branching …
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Structural modeling of dynamic polymer networks
Polymer network based gels are an important class of materials with a wide range of applications. Dynamic polymer networks, which crosslink via the formation of reversible bonds, in particular have great potential as stimuli responsive, mechanically tunable, and self-healing materials. Many …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are developed for optical communications. The second part reports the experimental investigation of a novel liquid-crystal-infiltrated …
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