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954 full-text articles. Page 24 of 34.

Synthesis Of Novel Raft Monomers And Applications Into Advances In Covalent Adaptable Networks, Christopher Robert Fenoli 2014 University of Colorado Boulder

Synthesis Of Novel Raft Monomers And Applications Into Advances In Covalent Adaptable Networks, Christopher Robert Fenoli

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

The focus of this research was the application of organic synthesis for new monomer development of Reversible Addition Chain Transfer (RAFT) compounds (i.e. trithiocarbonates and allyl sulphides), and the application of these monomers into photostimuli responsive networks designated as Covalent Adaptable Netowrks (CAN's). A mild, efficient, and high yield synthesis of a variety of trithiocarbonates and allyl sulphide containing AFCT (Addition-Fragmentation Chain-Transfer Termination) monomers containing terminal (meth)acrylate functional groups was presented. The ability of these monomers to control the mechanical and polymerization properties of thiol-Michael and chain-growth polymer networks in a previously unattainable manner is described.

Controllable ...


Self-Assembled Nanostructures In Block Copolymer Thin Films For Nanofabrication, Chunlin He 2014 University of Colorado Boulder

Self-Assembled Nanostructures In Block Copolymer Thin Films For Nanofabrication, Chunlin He

Chemistry & Biochemistry Graduate Theses & Dissertations (1986-2018)

Self-assembly of block copolymer in thin films provides an attractive approach to fabricating nanoscale dots and lines (5~100 nm) rapidly and in parallel over wafer-scale areas. This PhD dissertation mainly studies using the cross-linking reaction based on epoxide incorporated in copolymers to control the nanostructures of self-assembled block copolymer in thin films.

Although control over the domain orientation and long-range order of block copolymer nanostructures self-assembled in thin films has been achieved using various directed self-assembly techniques, more challenging but equally important for many lithographic applications is the ability to precisely control the shape of the interface between domains ...


Formation Of Microstructures In Crosslinked Polymer Films By Photocrosslinking Of Monomers In Evaporating Solvents, Liang Wang 2014 University of Colorado Boulder

Formation Of Microstructures In Crosslinked Polymer Films By Photocrosslinking Of Monomers In Evaporating Solvents, Liang Wang

Mechanical Engineering Graduate Theses & Dissertations

Crosslinked microstructured polymer films have received much attention due to their potential applications. Currently, these polymer films can be fabricated through a range of processes and lithographic techniques. However, they often require multiple fabrication steps and expensive instruments. In this thesis, we report the structure formation of films obtained via a simple, low cost one-step synthesis/fabrication process, by in situ photocrosslinking of precursors during the evaporation of solvents.

Under controlled dry N2 flow, the forced convective evaporation resulted in highly hierarchical film morphology, featuring a skin layer atop of a layer of microspheres. This unique morphology is determined ...


Addressing Public Health Risks Of Persistent Pollutants Through Nutritional Modulation And Biomimetic Nanocomposite Remediation Platforms, Bradley J. Newsome 2014 University of Kentucky

Addressing Public Health Risks Of Persistent Pollutants Through Nutritional Modulation And Biomimetic Nanocomposite Remediation Platforms, Bradley J. Newsome

Theses and Dissertations--Chemistry

Due to their relative chemical stability and ubiquity in the environment, chlorinated organic contaminants such as polychlorinated biphenyls (PCBs) pose significant health risks and enduring remediation challenges. Engineered nanoparticles (NPs) provide a novel platform for sensing/remediation of these toxicants, in addition to the growing use of NPs in many industrial and biomedical applications, but there remains concern for their potential long-term health effects. Research highlighted herein also represents a transdisciplinary approach to address human health challenges associated with exposure to PCBs and NPs. The objectives of this dissertation research are two-fold, 1) to develop effective methods for capture/sensing ...


Sustainable Thermoplastic Elastomers Derived From Renewable Cellulose, Rosin And Fatty Acids, Y. Liu, K. Yao, Xiaoming Chen, Jifu Wang, Zhongkai Wang, Harry J. Ploehn, C. Wang, F. Chu, Chuanbing Tang 2014 University of South Carolina - Columbia

Sustainable Thermoplastic Elastomers Derived From Renewable Cellulose, Rosin And Fatty Acids, Y. Liu, K. Yao, Xiaoming Chen, Jifu Wang, Zhongkai Wang, Harry J. Ploehn, C. Wang, F. Chu, Chuanbing Tang

Faculty Publications

Two series of graft copolymers, cellulose-g-poly(n-butyl acrylate-co-dehydroabietic ethyl methacrylate) (Cell-g-P(BA-co-DAEMA)) and cellulose-g-poly(lauryl methacrylate-co-dehydroabietic ethyl methacrylate) (Cell-g-P(LMA-co-DAEMA)), were prepared by “grafting from” atom transfer radical polymerization (ATRP). In these novel graft copolymers, cellulose, DAEMA (derived from rosin), and LMA (derived from fatty acids) are all sourced from renewable natural resources. The “grafting from” ATRP strategy allows the preparation of high molecular weight graft copolymers consisting of a cellulose main chain with acrylate copolymer side chains. By manipulating the monomer ratios ...


Self-Assembly And Ring-Opening Metathesis Polymerization Of A Bifunctional Carbonate–Stilbene Macrocycle, Y. Xu, W. L. Xu, Mark D. Smith, Linda S. Shimizu 2014 University of South Carolina - Columbia

Self-Assembly And Ring-Opening Metathesis Polymerization Of A Bifunctional Carbonate–Stilbene Macrocycle, Y. Xu, W. L. Xu, Mark D. Smith, Linda S. Shimizu

Faculty Publications

No abstract provided.


Degradation Of High Voltage Glass Fiber-Reinforced Polymer Matrix Composites By Aggressive Environmental Conditions, Tianyi Lu 2014 University of Denver

Degradation Of High Voltage Glass Fiber-Reinforced Polymer Matrix Composites By Aggressive Environmental Conditions, Tianyi Lu

Electronic Theses and Dissertations

Polymer matrix composites reinforced with either E glass or ECR glass fibers-reinforced are used in a variety of high voltage electrical applications because of their advantages like lower weight and cost. However, they can be damaged by aggressive in-service conditions such as high temperature, ultraviolet radiation, moisture, ozone and corrosive environments. Different degradation mechanisms can develop in high voltage PMCs under those extreme environments, which, in turn, can affect the long term structural durability of the composites. A set of PMCs reinforced with ECR-glass and E-glass fibers embedded in four different resins has been investigated in this study. In addition ...


Bio-Based Polymeric Materials From Vegetable Oils, Ruqi Chen 2014 Iowa State University

Bio-Based Polymeric Materials From Vegetable Oils, Ruqi Chen

Graduate Theses and Dissertations

Vegetable oils have been utilized in developing various types of bio-based materials in my research work.

Bio-based polyhydroxy fatty acids have been subject to ring-opening epoxidized soybean oil with alkaline catalyst DBU to generate polyols with varying OH numbers. Polyurethane films were obtained using these polyols polymerized with isophrone diisocyanates. The polyhydroxy fatty acids were also used as internal emulsifiers in anionic polyurethane dispersion synthesis due to the presence of carboxylic acid groups in their structures. In addition, acrylated epoxidized soybean oil was involved in another project. 2-methyl aziridine was added to acrylic groups via Michael addition mechanism under mild ...


Novel Bio-Based And Biodegradable Polymer Blends, Shengzhe Yang 2014 Iowa State University

Novel Bio-Based And Biodegradable Polymer Blends, Shengzhe Yang

Graduate Theses and Dissertations

Most plastic materials, including high performance thermoplastics and thermosets are produced entirely from petroleum-based products. The volatility of the natural oil markets and the increasing cost of petroleum have led to a push to reduce the dependence on petroleum products. Together with an increase in environmental awareness, this has promoted the use of alternative, biorenewable, environmentally-friendly products, such as biomass. The growing interest in replacing petroleum-based products by inexpensive, renewable, natural materials is important for sustainable development into the future and will have a significant impact on the polymer industry and the environment. This thesis involved characterization and development of ...


Elucidating The Reactivity And Structure-Property Relationships Of Benzobisoxazoles For The Rational Design Of Conjugated Materials, Brian Charles Tlach 2014 Iowa State University

Elucidating The Reactivity And Structure-Property Relationships Of Benzobisoxazoles For The Rational Design Of Conjugated Materials, Brian Charles Tlach

Graduate Theses and Dissertations

Benzobisoxazoles are rigid electron deficient aromatic heterocycles with good thermal, environmental, and chemical stability. Much work has been done on the design of new electron rich conjugated materials for organic semiconductors, however, the research on modification or development of electron deficient aromatics has been limited. Our group has developed a mild synthesis of non-halogenated and 4,8-dihalogenated benzobisoxazoles from cheap and readily available starting materials to use as electron deficient moieties in organic semiconductors. Using the halogens as synthetic handles to further functionalize the benzobisoxazoles, the optical, electronic, and physical properties of the system are tuned through inductive, resonance, and ...


Bio-Based Thermosetting Copolymers Of Eugenol And Tung Oil, Harris Handoko 2014 Iowa State University

Bio-Based Thermosetting Copolymers Of Eugenol And Tung Oil, Harris Handoko

Graduate Theses and Dissertations

There has been an increasing demand for novel synthetic polymers made of components derived from renewable sources to cope with the depletion of petroleum sources. In fact, monomers derived vegetable oils and plant sources have shown promising results in forming polymers with good properties. The following is a study of two highly viable renewable sources, eugenol and tung oil (TO) to be copolymerized into fully bio-based thermosets. Polymerization of eugenol required initial methacrylate-functionalization through Steglich esterification and the synthesized methacrylated eugenol (ME) was confirmed by 1H-NMR. Rheological studies showed ideal Newtonian behavior in ME and five other blended ME resins ...


Novel Cationic Pentablock Copolymers As A Nanovaccine Delivery Platform, Justin Adams 2014 Iowa State University

Novel Cationic Pentablock Copolymers As A Nanovaccine Delivery Platform, Justin Adams

Graduate Theses and Dissertations

The main objective of this project is the development of a safe and effective vaccine against respiratory pathogens including the highly pathogenic avian influenza (HPAI) H5N1. Amphiphilic pentablock copolymers based on Pluronic F127 and poly(2-diethylaminoethyl methacrylate (PDEAEM) have several characteristics that make them promising candidates as injectable vaccine carriers and adjuvants. Individual block copolymer molecules self-assemble into micelles in aqueous solutions. These micelles can be used to encapsulate protein for vaccine delivery. As the concentration of the block copolymer increases, the micelles form a temperature dependent gel and the length of the PDEAEM blocks control the dissolution rate of ...


Tandem Mass Spectrometry Of Multiply Charged Polymers: Using Ms3 Strategies For Full Structural Characterization Of Polyacrylamides, Paul M. Krauss 2014 University of Akron Main Campus

Tandem Mass Spectrometry Of Multiply Charged Polymers: Using Ms3 Strategies For Full Structural Characterization Of Polyacrylamides, Paul M. Krauss

Williams Honors College, Honors Research Projects

In mass spectrometry, a compound is taken and converted into a gas-phase ion by an electrical charge (Balogh, 2009). From these ions, a chart is then created that displays the mass to charge ratio, which is able to then be analyzed to find out the charge of the ions, as well as the mass of the compound (Balogh, 2009). One specific type of mass spectrometry there is available is known as a fragmentation spectrometry. In fragmentation spectrometry, the molecule is not only ionized and analyzed, but fragmented parts that are formed into ions are also ionized and analyzed. This is ...


Form Factor Of Pnipam Microgels In Overpacked States, U. Gasser, J. S. Hyatt, J.- J. Lietor-Santos, E. S. Herman, L. Andrew Lyon, A. Fernandez-Nieves 2014 Paul Scherrer Institute

Form Factor Of Pnipam Microgels In Overpacked States, U. Gasser, J. S. Hyatt, J.- J. Lietor-Santos, E. S. Herman, L. Andrew Lyon, A. Fernandez-Nieves

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

We study the form factor of thermoresponsive microgels based on poly(N-isopropylacrylamide) at high generalized volume fractions, ζ, where the particles must shrink or interpenetrate to fit into the available space. Small-angle neutron scattering with contrast matching techniques is used to determine the particle form factor. We find that the particle size is constant up to a volume fraction roughly between random close packing and space filling. Beyond this point, the particle size decreases with increasing particle concentration; this decrease is found to occur with little interpenetration. Noteworthily, the suspensions remain liquid-like for ζ larger than 1, emphasizing the importance ...


Synthesis And Characterization Of A New Cyano-Substituted Tris(Pyrazolyl)Borate And Its Thallium(I) Complex, Bozumeh Som 2013 East Tennessee State University

Synthesis And Characterization Of A New Cyano-Substituted Tris(Pyrazolyl)Borate And Its Thallium(I) Complex, Bozumeh Som

Electronic Theses and Dissertations

A new cyanoscorpionate - tris(4-cyano-3,5-diphenylpyrazolyl)borate (TpPh2,4CN) has been synthesized and characterized. The thallium complex of this ligand TlTpPh2,4CN has also been prepared and characterized by FT-IR, 1H NMR, and single-crystal X-ray-diffraction. The complex TlTpPh2,4CN crystalized in the monoclinic space group C2/c with unit cell a = 14.6697(10) Å, b = 13.9493(10) Å, c = 19.3347(12) Å, and b= 91.761(2)°. Structural comparison of TlTpPh2,4CN with analogous complexes demonstrated the effects of both steric and electron-withdrawing substituents on coordination geometry and the electronic properties of ...


Formulation Development Of A Polymer-Drug Matrix With A Controlled Release Profile For The Treatment Of Glaucoma, Eric W. Tsoi 2013 California Polytechnic State University, San Luis Obispo

Formulation Development Of A Polymer-Drug Matrix With A Controlled Release Profile For The Treatment Of Glaucoma, Eric W. Tsoi

Master's Theses and Project Reports

Glaucoma is the leading cause of blindness in the United States accounting for 9-12% of all cases of blindness. Currently, the front line treatment for glaucoma are prostaglandins that may have to be taken up to several times a day. Even with proper treatment, roughly 11% of the patients using the treatment are non-compliant and lose their vision. In this project, ForSight Laboratories has developed a pharmaceutical drug delivering implant with the capability of sustaining long-term release of a prostaglandin as a new way to treat the condition. This project reports the product development of a polymer drug matrix with ...


Design And Synthesis Of Flexible And Functional Polybenzoxazine Thin Films, Austin David Baranek 2013 University of Southern Mississippi

Design And Synthesis Of Flexible And Functional Polybenzoxazine Thin Films, Austin David Baranek

Dissertations

Polybenzoxazines offer the unique ability to incorporate a variety of properties and functionality into a single polymer network through simple synthetic techniques. However, within benzoxazine materials exist certain drawbacks of which brittleness is the primary issue when exploring thin film applications. This brittleness leads to poor mechanical stability and would reduce the lifetime of any device sought after. It is, however, through the simplistic nature of the benzoxazine monomer synthesis that the mechanical stability could be addressed chemically, avoiding the complications of using rubber toughening agents or plasticizers. The monomer synthesis offers tailorability of both the phenol and amine to ...


Nanoparticles And Polymer Crystallization Kinetics In Hybrid Electronic Devices, Taylor William Wagner 2013 California Polytechnic State University, San Luis Obispo

Nanoparticles And Polymer Crystallization Kinetics In Hybrid Electronic Devices, Taylor William Wagner

Master's Theses and Project Reports

Conjugated semi-conducting polymers have become well known for their potential applications in hybrid electronic devices like solar cells, LEDs, and organic displays. These hybrid devices also contain inorganic nanoparticles, which complement the polymer when they are combined into the same layer. Control over the conformation and crystallinity of the polymer is critical for device performance, yet not much is known about the effect that these nanoparticles have on the polymer. Here, zinc oxide nanowire was surface modified with mono-substituted-carboxylic acid tetraphenylporphyrin and dodecanethiol, and introduced to poly(3-hexyl thiophene) in solution. The electron transfer, kinetics, and thermodynamics of this system ...


Morphology And Conformation Of Polythiophene Derivatives In Anisotropic Core-Shell Nanocomposites And Solution, Neil Redeker 2013 California Polytechnic State University, San Luis Obispo

Morphology And Conformation Of Polythiophene Derivatives In Anisotropic Core-Shell Nanocomposites And Solution, Neil Redeker

Master's Theses and Project Reports

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 applications, including low cost and high flexibility, but electronic devices based on these materials are currently limited by poor performance. Because of these limitations, increased focus has been placed on improving conjugated polymers for use in commercially viable products. Here, a novel core shell hybrid nanocomposite based on anisotropic zinc oxide nanowires and a side-chain functionalized polythiophene is reported ...


Phase Behavior And Rheology Of Latex, Thickener, Surfactant Mixtures And Liquid Crystal Based Compositions For Printing High-Efficiency Flexible Electronics, Franceska Anna Santos 2013 California Polytechnic State University, San Luis Obispo

Phase Behavior And Rheology Of Latex, Thickener, Surfactant Mixtures And Liquid Crystal Based Compositions For Printing High-Efficiency Flexible Electronics, Franceska Anna Santos

Master's Theses and Project Reports

This project consists of two parts. One area of focus in the first part is understanding the interactions between a non-ionic, block copolymer type dispersant and hydrophobically-modified, ethoxylated urethane (HEUR) associative thickeners in water. The dispersant was mixed at various concentrations (0-2% by weight) with HEUR thickeners at 1% by weight concentration in the aqueous medium. This study is an integral part of our attempts to determine mechanisms of viscosity drop when colorant dispersions are added to latex tint base formulations thickened with associative thickeners. One of the HEUR thickeners is a product that has been available for over three ...


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