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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 139 for “"polymer chain"”.
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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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Single Molecule Force Extension Measurement on Semi-Flexible Biopolymers Using Magnetic Tweezers
Polymers are pervasive in modern society and are commonly encountered in a wide-range of industrial processes. Polymer chains exhibit complex dynamical phenomena in solutions undergoing convective transport, and a proper understanding of chain dynamics is key to optimizing process conditions. The …
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Ultrasonic Welding of Glassy Thermoplastic Polymers
Ultrasonic welding of thermoplastic polymers has been practiced industrially for many years without being fully understood. This study includes an analysis of the energy dissipation mechanisms responsible for the formation of ultrasonic welds in PMMA including viscoelastic loss and by plastic …
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Novel molecular architectures from iptycene polymers
… explored the incorporation of iptycenes into polymers as a means to enhance the mechanical properties. Iptycene structures were targeted because they possess a unique structural property called internal molecular free volume. When these bulky pendant groups are incorporated into the backbone …
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Crystallization and melting behavior of (ε-caprolactone)-based homopolymer and triblock copolymer
… are related to the chemical structure of the polymer chain in the case of PCL. The fold interfacial free energy is related to the chain stiffness, and a recent proposal relates σ to the characteristic ratio, C<sub>∞</sub>. This work will examine the validity of the proposed relationship for …
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Electro-optical Properties of Ultra-Thin Organic Films
… and biomedical applications. The thickness of polymer films developed for these applications has decreased dramatically making interfacial effects significant. It is well documented that, in submicron thickness range, both film/substrate & film/air interface are critical. In this study, we …
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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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Rheology Of Cross-Linked Polymers And Polymer Foams: Theory And Experimental Results
<p>Typical polymers have a time-dependent response to loading which results in stress relaxation or creep. Models using springs/dashpots or Volterra integrals are capable of predicting the material response, but place little or no emphasis on the reasoning behind the response. This research …
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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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Synthesis and process optimization of colloidal unimolecular polymer, cup, particle formation, and its interfacial surface tension behavior
<p>"Colloidal Unimolecular Polymer (CUP) particles are 3-9 nm size single-chain polymer nanoparticles that are made from amphiphilic acrylic co-polymers using the process of water reduction. The formation of CUP particles was driven by the polymer-polymer interactions being greater than …
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The Vibrational Spectra of Chlorosubstituted Hydrocarbons
… on detailed structure and conformation of the polymer chain. Conformational content of model compounds by infrared spectroscopy has been shown to be very valuable in relation to the polymer. In particular, the C-C1 stretching frequency of poly (vinyl chloride) is sensitive to structure and …
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Structure, Dynamics and Rheology of Polymer Solutions from Coarse-Grained Molecular Dynamics: Effects of Polymer Concentration, Solvent Quality and Geometric Confinement
… in the design and optimization of ubiquitous polymer processing operations.</p> <p>Further, such interactions are routinely encountered in separation of biopolymer mixtures</p> <p>using gel electrophoresis and microfluidic technologies, manufacturing of polymer-based</p> <p>functional …
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Material Extrusion based Additive Manufacturing of Semicrystalline Polymers: Correlating Rheology with Print Properties
… is to enable MatEx of semicrystalline polymers with mechanical properties approaching that of injection molded parts. Tailored molecular architectures of blends that can control the crystallization kinetics from the melt state are investigated. By modifying the crystallization time …
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Molecular necklaces: polyester rotaxanes
… whose cavities are pierced by polysebacate chains were synthesized by several polymerization approaches including transesterification polymerization, the acid chloride method, and interfacial polymerization. The polyrotaxanes were purified by multiple reprecipitations into good solvents for …
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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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Methods for increasing the thermal conductivity of ultra-high molecular weight polyethylene (UHMWPE)
… with high thermal conductivity by way of polymer chain orientation. The first portion of this report surveys current research involving polyethylene chain orientation and manufacturing. This section includes analysis of shish-kebab morphology, past polymer thermal studies, …
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Ionene and ionene alkyl sulfate stoichiometric complexes
… complexes represent a type of comb-shaped polymers, in which every polymer chain unit has an electrostatically bound "side chain". These complexes are water-insoluble. In the solid state they assemble spontaneously into mesogenic structures. The [X,Y]-ionenes …
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Applications of Funneled Landscapes: Protein Folding and Molecular Recognition
… folding which includes a specific potential, a polymer chain entropy, and explicit physically motivated cooperativities. The functional is applied to a range of protein systems in order to characterize their folding funnels. General features of folding are explored and specific results compared …
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Artificial muscle morphology : structure/property relationships in polypyrrole actuators
… seek to improve polypyrrole and other conducting polymer actuators by discovering and exploiting the connection between nanoscale transport events and macroscale active strain. To this end we have used diffraction and electron microscopy to investigate the microstructure of polypyrrole. and …
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Generative Diffusion Models Towards De Novo Protein Design
… atoms with rigid biochemical constraints of the polymer chain while the sequence is a series of discrete amino acids that should fold into a plausible structure. Understanding the protein function-structure-sequence relationship necessary for protein design is complex, but deep learning has …
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