One-Pot Synthesis And Characterization Of A “Click-Able” Polyester Polymer For Potential Biomedical Applications, 2017 Pittsburg State University
One-Pot Synthesis And Characterization Of A “Click-Able” Polyester Polymer For Potential Biomedical Applications, James F. Beach Ii
Electronic Thesis Collection
In this study, a synthetic polyester polymer was designed using polyethylene glycol, sorbitol, glutaric acid and 4-pentynoic acid as monomers. The synthesis was carried out using standard melt polymerization technique and catalyzed by Novozyme-435, an enzyme suitable for polyesterification of biocompatible compounds. The progress of the reaction was monitored with respect to time and vacuum exposure, with samples being subjected to standard characterization protocols. Polymers with high molecular weight and water solubility were chosen for further modification into folate-functionalized polymeric nanoparticles for targeted drug delivery to cancer cells. This was achieved by employing a solvent diffusion method, wherein the polymer ...
Graphene Nanoribbons And Their Polymeric Nanocomposites: Controlled Synthesis, Characterization And Applications, 2017 Pittsburg State University
Graphene Nanoribbons And Their Polymeric Nanocomposites: Controlled Synthesis, Characterization And Applications, Nada M. Aljehany
Electronic Thesis Collection
Carbon based materials are very promising as electrode materials energy generation and storage devices. They have been used for fuel cells, supercapacitors and solar cells. Among the carbon-based materials, graphene is very attractive due to its unique properties such as high electrical conductivity, good mechanical flexibility, large theoretical surface area (2630 m2/g), and high thermal and chemical stability. These unique properties make them very suitable for energy storage applications particularly for supercapacitors. The performance of the graphene as energy storage material could be further improved by growing them in nanoribbon form by unzipping carbon nanotubes. In this thesis ...
Effects Of Processing Parameters On Properties Of Novel Silica-Filled Polysiloxane Materials, 2017 Pittsburg State University
Effects Of Processing Parameters On Properties Of Novel Silica-Filled Polysiloxane Materials, Kyle W. Schwenker
Electronic Thesis Collection
Polysiloxanes are a class of materials that possess high temperature stability and the ability to remain flexible at extremely low temperatures. Their elastomers generally exhibit low strength and have poor mechanical properties unless reinforced with fillers. Reinforcement can be accomplished by compounding reinforcing silica fillers with polysiloxanes via twin-screw extrusion compounding that vigorously mixes the fillers into a polymer matrix. In this thesis, a lab-scale twin-screw extruder was utilized to compound thermoplastic materials to determine the effects of processing on thermoplastics material properties, as well as to determine the extruder’s compounding effectiveness. Processing via lab-scale twin-screw extrusion did not ...
Performance Of Liquid Benzoxazine-Peg Blend Resin Systems For Potential Industrial Composites Processing, 2017 Western Washington University
Performance Of Liquid Benzoxazine-Peg Blend Resin Systems For Potential Industrial Composites Processing, Emily Brown
Graduate Student Symposium
The manufacturing of technology and materials based on benzoxazine resin is limited by melt or solvent-based processing in which benzoxazine monomer is either dissolved in a solvent or melted to transfer onto fiberglass or carbon fiber. Solvent based processing depends on the use of organic solvents which impart health and financial risks. Benzoxazine monomer also suffers from high curing temperatures where the benzoxazine polymerizes to form structures with desirable mechanical and thermal properties. Non-flammable liquid benzoxazine resin with low curing temperatures are attractive for their exclusion of organic solvents and ease of processing. In this study three series of blends ...
Abca' Tetrablock Terpolymers: Synthesis And Morphology, 2017 University of Minnesota - Twin Cities
Abca' Tetrablock Terpolymers: Synthesis And Morphology, Madalyn Radlauer, Seijiro Fukuta, Megan Matta, Joshua Van Benschoten, Marc Hillmyer
Faculty Publications, Chemistry
No abstract provided.
Design-Structure-Property Relationships Of Purine-Based Copolymers And Chromophores, 2017 University of Tennessee, Knoxville
Design-Structure-Property Relationships Of Purine-Based Copolymers And Chromophores, Graham Smith Collier
Understanding the relationship between monomer design and polymer properties is imperative for developing polymeric systems that can find applicability in targeted technologies. Purines have been extensively studied across many scientific disciplines and are useful due to the diverse properties they possess, which is due in part to the broad scope of precise synthetic transformations that are used to tailor their properties. The overarching goal of my dissertation involves developing the synthesis of “poly(purine)s” and investigating the effect of purine monomer design on polymer properties. In this vein, poly(purine)s and purine-based donor-acceptor small-molecules are synthesized via Stille ...
Impact Of Macromolecular Design On Self-Assembly Properties Of Block Copolymers: Effect Of Tunable Chain Flexibility And Chain Topology, 2017 University of Tennessee, Knoxville
Impact Of Macromolecular Design On Self-Assembly Properties Of Block Copolymers: Effect Of Tunable Chain Flexibility And Chain Topology, Kamlesh Ramesh Bornani
The generation of well-ordered complex structures from constituent block copolymeric building blocks by the spontaneous process of self-assembly is useful in various technologies. The well-defined 3D structures are dictated by complex energetic interplays and their shape is controllable by both preparative conditions and macromolecular design. This dissertation work aims at exploring the effect of chain flexibility and chain topology design changes on phase behavior of block copolymers in solution. Further, we exploit the tunable flexibility of the semiflexible polymers in studying dispersion and controlling macroscale thermal properties in polymer nanocomposites.
The experimental design is based on two model systems: The ...
Development Of High Performance Gas Separation Membranes Through Intelligent Catalyst And Monomer Design, 2017 University of Tennessee, Knoxville
Development Of High Performance Gas Separation Membranes Through Intelligent Catalyst And Monomer Design, Kevin Richard Gmernicki
Polymer membranes are a valuable tool for separating components of liquid and gas mixtures. Heavily inspired by biological systems, the idea of using the intrinsic properties of polymers to perform otherwise energy-intensive tasks is attractive for applications such as water desalination, natural gas sweetening, and post-combustion carbon capture. Of particular interest to our research group, post-combustion carbon capture is a promising potential solution aimed at reducing the carbon footprint involved with production, transportation, and storage of electrical energy generation.
Every year, the United States produces close to seven billion metric tons of carbon dioxide, of which a significant portion is ...
Effect Of Crosslinking On Carbon Nanotube Materials Through Chemical Treatment And Irradiation, 2017 University of Tennessee, Knoxville
Effect Of Crosslinking On Carbon Nanotube Materials Through Chemical Treatment And Irradiation, Xinyi Lu
Carbon nanotubes (CNTs) exhibit a variety of exceptional properties, especially their ultrahigh tensile strength on the order of 100GPa show promise for constituting the next-generation carbon fiber. However, challenges remain to translate these properties into useful technology, primarily due to the sliding of the tubes past one another under tensile loading. The work presented in this dissertation is focused on enhancing the interaction between the CNTs and their bundles in a macro-assembly, in order to improve the tensile properties of the material.
Applying inter-tube crosslinks has been predicted to significantly enhance the stress transfer between the CNT components. We developed ...
Exploring Thermoresponsive Affinity Agents To Enhance Microdialysis Sampling Efficiency Of Proteins, 2017 University of Arkansas, Fayetteville
Exploring Thermoresponsive Affinity Agents To Enhance Microdialysis Sampling Efficiency Of Proteins, Thaddeus Vasicek
Theses and Dissertations
Affinity agents increase microdialysis protein relative recovery, yet they have not seen widespread use within the microdialysis community due to their additional instrumentation requirements and prohibitive cost. This dissertation describes new affinity agents for microdialysis that require no additional instrumentation to use, have nearly 100% particle recovery, are 7 times more cost efficient than alternatives, and have low specificity enabling their use for a wide variety of proteins. Initially gold nanoparticles were chosen as an affinity ligand support due to their high surface area/volume ratio and colloidal stability. Poly (N-isopropylacrylamide) was immobilized to the gold nanoparticles, which served to ...
Rate Acceleration Of Organocatalytic Ring-Opening Polymerization Rough The Application Of Bis- And Tris- ( Io)Urea H- Bond Donors, 2017 University of Rhode Island
Rate Acceleration Of Organocatalytic Ring-Opening Polymerization Rough The Application Of Bis- And Tris- ( Io)Urea H- Bond Donors, Samuel S. Spink
Senior Honors Projects
Well-defined and functionalized polymers have a wide variety of applications in biomedical studies. Advancements in the fields of drug delivery, microelectronics, and medical imaging, among other applications, are predicated upon the development of methods for the synthesis of precision polymers. Organocatalytic ring-opening polymerization (ROP) of cyclic monomers is an effective route to the production of polymeric materials, namely polyesters and polycarbonates, whose biodegradable properties make them a viable option in biomedical research. Arguably, H-bond mediated catalysts are among the most selective catalysts for ROP, giving rise to highly functionalized polycarbonates, well-controlled polymerizations, and other custom tailored applications. With respect to ...
Silver Nanoparticles As A Potential Solar Absorber, 2017 Bowling Green State University
Silver Nanoparticles As A Potential Solar Absorber, Benjamin Hardy
This work reports the development of Silver nanoparticles implanted into a polymer as a solar absorber. The plasmonic nature of silver nanoparticle allows for adjustments to be made in its UV-VIS-NIR absorbance spectrum. A combination of different sized/shaped particles could result in ideal absorption of the majority of the solar spectrum. Allotting this with the stability of a polymer leads to potential solids or solutions that could work as a solar absorber. Tests were also performed to determine whether or not UV-C irradiation during synthesis effects the characteristics of silver nanoparticles, in particular the absorbance. Successful synthesis of silver ...
Effect Of Molecular Structure Of Side Chain Polymers On "Click" Synthesis Of Thermosensitive Molecular Brushes, 2017 University of Tennessee, Knoxville
Effect Of Molecular Structure Of Side Chain Polymers On "Click" Synthesis Of Thermosensitive Molecular Brushes, Christie Maggie Lau
Chancellor’s Honors Program Projects
No abstract provided.
Thermally Robust And Redox Active Catalysts: Studying Their Behavior For Ethylene And L-Lactide Polymerization, 2017 University of Tennessee, Knoxville
Thermally Robust And Redox Active Catalysts: Studying Their Behavior For Ethylene And L-Lactide Polymerization, Lauren Ashley Brown
The development of homogenous single-site catalysts has significantly impacted the field of organometallic chemistry. The well-defined structures of homogenous catalysts make it less cumbersome to understand and develop methods to tailor these compounds for specific catalytic processes. Currently, polymerization catalysis is a major division in organometallic chemistry due to the global demand for polymeric materials such as polyethylene (PE) and polypropylene (PP), based on their low-cost feedstock, remarkable mechanical properties, and their use in a wide range of applications. However, bioplastics have become a highly sought-after alternative to conventional petrochemical-based plastics due to their biodegradability and derivatization from renewable resources ...
Improving Water Barrier Properties Of Epoxy Coatings With Addition Of Graphene Oxide, 2017 College of William and Mary
Improving Water Barrier Properties Of Epoxy Coatings With Addition Of Graphene Oxide, Sang H. Kim
Undergraduate Honors Theses
Epoxy coating paint is commonly used in metal coatings in aircraft and marine constructions due to its excellent mechanical properties and chemical resistance. However, being in a harsh environment, they are susceptible to degradation by water which significantly reduces the lifetime of the coatings. To better protect the material from corrosion, stress, degradation and absorption of water, nanofillers can be incorporated to improve the barrier properties. This paper explores the effect of incorporating graphene oxide (GO) as a nanofiller and the effect of different functionalization and surface modification of graphene oxide on reducing the water vapor permeability and water absorption ...
All Acrylic Based Thermoplastic Elastomers: Design And Synthesis For Improved Mechanical Performance, 2017 University of Tennessee, Knoxville
All Acrylic Based Thermoplastic Elastomers: Design And Synthesis For Improved Mechanical Performance, Wei Lu
Thermoplastic elastomers (TPEs) have been widely studied because of their recyclability, good processability, low production cost and distinct performance. Compared to the widely-used styrenic TPEs, acrylate based TPEs have potential advantages including exceptional chemical, heat, oxygen and UV resistance, optical transparence, and oil resistance. However, their high entanglement molecular weight lead to “disappointing” mechanical performance as compared to styrenic TPEs. The work described in this dissertation is aimed at employing various approaches to develop the all acrylic based thermoplastic elastomers with improved mechanical performance.
The first part of this work focuses on the introduction of acrylic polymers with high glass ...
Hetero-Atom Containing Functional Polymers: Synthesis, Characterization And Applications, 2017 University of Tennessee, Knoxville
Hetero-Atom Containing Functional Polymers: Synthesis, Characterization And Applications, Hongbo Feng
A mission to manage ever increased energy demands and reduce carbon foot print has challenged scientists and engineers to develop new materials with superior characteristics. In this scenario, lithium-ion batteries have been the dominating technology for not only applications in consumer electronics but also are essential for clean energy storage. On the other hand, the capture and separation of CO2 [carbon dioxide] in power generation and in industrial processes is considered to be a key to reduce the carbon footprint.
Living anionic polymerization along with controlled polymerization techniques has realized the preparation of a wide variety of functional polymers ...
Design And Synthesis Of Polymer Brush Surfaces With Complex Molecular Architectures And Morphologies, 2017 University of Southern Mississippi
Design And Synthesis Of Polymer Brush Surfaces With Complex Molecular Architectures And Morphologies, Wei Guo
The combination of surface-initiated polymerization (SIP) and postpolymerization modification (PPM) is a powerful technique for the fabrication of functional soft surfaces. Better understanding the influence of the aforementioned factors on the PPM effectiveness is valuable for fulfilling the potential of the PPM approach for the fabrication of functional soft surfaces. Specifically, by carefully balancing modification reactivity and limitation of mass transport, polymer brush with composition heterogeneity and gradient along the normal direction of the surface otherwise unattainable by methods of direct polymerization can be fabricated via the PPM approach which opens doors to new routes to polymer brush with complex ...
Effect Of Chain Rigidity On Network Architecture And Deformation Behavior Of Glassy Polymer Networks, 2017 University of Southern Mississippi
Effect Of Chain Rigidity On Network Architecture And Deformation Behavior Of Glassy Polymer Networks, Kyler Reser Knowles
Processing carbon fiber composite laminates creates molecular-level strains in the thermoset matrix upon curing and cooling which can lead to failures such as geometry deformations, micro-cracking, and other issues. It is known strain creation is attributed to the significant volume and physical state changes undergone by the polymer matrix throughout the curing process, though storage and relaxation of cure-induced strains remain poorly understood. This dissertation establishes two approaches to address the issue. The first establishes testing methods to simultaneously measure key volumetric properties of a carbon fiber composite laminate and its polymer matrix. The second approach considers the rigidity of ...
An Investigation Of The Use Of Cerium And Polyhedral Oligomeric Silsesquioxanes For The Protection Of Polymeric Epoxy Compounds In The Low Earth Orbit Environment, 2017 University of Southern Mississippi
An Investigation Of The Use Of Cerium And Polyhedral Oligomeric Silsesquioxanes For The Protection Of Polymeric Epoxy Compounds In The Low Earth Orbit Environment, Jessica Miriam Piness
Low Earth orbit presents many hazards for composites including atomic oxygen, UV radiation, thermal cycling, micrometeoroids, and high energy protons. Atomic oxygen and vacuum ultraviolet radiation are of concern for space-bound polymeric materials as they degrade the polymers used as matrices for carbon fiber composites, which are used in satellites and space vehicles due to their high strength to weight ratios. Epoxy-amine thermosets comprise a common class of matrix due to processability and good thermal attributes. Polyhedral oligomeric silsesquioxanes (POSS) have shown the ability to reduce erosion in polyimides, polyurethanes, and other polymers when exposed to atomic oxygen. The POSS ...