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 31 for “"Polymer Fibers"”.
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Electrodeposition of conducting polymer fibers
Conducting polymers are materials that possess the electrical conductivity of metals while still retaining the mechanical properties such as flexibility of traditional polymers. Polypyrrole (PPy) is one of the more commonly studied electrically conducting polymers due to its high conductivity and …
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Modeling of Dry Spinning of Polymer Fibers
… data for different DPF (denier per fiber) fibers and fairly good agreement is acquired by tuning the prefactors in the phenomenological diffusion coefficients. It is also suggested that more systematic diffusion coefficient measurements are needed. (Abstract shortened by UMI.).
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The mechanical behavior of high performance polymer fibers
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1992.
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The role of self-healing coatings on soft polymer fibers
… unique self-healing mechanical properties. PDMS fibers were coated with metal-coordination bonds crosslinked PEG gels and their mechanical properties were tested with uniaxial tension tests. The synthetic system achieved a similar behavior to that of the natural mussel fibers, showing that a thin …
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Mechanical property characterization and enhancement of rigid rod polymer fibers
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Multifunctional Polymer Fibers for Wearable Biosensors and Neural Medical Treatments
… develop new tools grows rapidly. Multifunctional polymer fibers allow scientists to have a plethora of tools by fine tuning parameters to create affordable, unique, and adaptable devices for analyte sensing and disease treatment. The range of applications mutltifunctional fibers have in biomedical …
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Electrospun polymer fibers for triboelectric energy harvesting applications in smart textiles
… issues by developing nanostructured functional polymer coatings, namely Nylon-11, polymethyl methacrylate (PMMA) and polyvinylidene difluoride (PVDF), using electrospinning, which is a widely used, scalable fiber-production method. These materials are selected because they respectively occupy …
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Engineering Mechanocaloric Effects and Tunable Thermal Conductivity in Amorphous Elastic Polymer Fibers
… applications. Properly-engineered polymer materials may provide solutions to both challenges in a synergistic way. Among all materials, polymers stand out by several figures of merit, including low cost, chemical inertness, ease of manufacture and scalability, and light weight. They …
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Aligned Continuous Cylindrical Pores Derived from Electrospun Polymer Fibers in Titanium Diboride
The use of electrospun polystyrene (PS) fibers to create continuous long range ordered multi-scale porous structures in titanium diboride (TiB2) is investigated in this work. The introduction of electrospun PS fibers as a sacrificial filler into a colloidal suspension of TiB2 allows for easy …
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Viscoelastic response of wound polymer cord with multiple filament cross-sections
… include the time-dependent response of twisted polymer fibers under an applied axial load. This modified theory incorporates the cord material's response by utilizing the Wiechert model and the Schapery collocation method. The geometric effects are then combined with the material properties in …
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Polyethylene fiber drawing optimization
Polymer fiber drawing creates fibers with enhanced thermal conductivity and strength compared to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve polymer fibers that are drawn to lengths exceeding 1cm and develop a method to …
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Fabrication of nanofiber scaffolds by electrospinning and it's potential for tissue engineering
… an electric field to control the deposition of polymer fibers on to a target substrate. This electrospinning strategy can be used to fabricate fibrous polymer mats composed of fiber diameters ranging from several microns down to tens of nanometers. This study assesses the potential of …
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Electrospinning polyampholyte nanofiber membranes
… (TMA) and 2-carboxy ethylacrylate (CAA) copolymers have previously been shown to have nonfouling properties. This resistance to nonspecific protein adsorption makes the polymer a candidate for filtration applications where irreversible protein fouling is problematic. However, the low …
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Elastografia Supersonic Shear Imaging em músculo esquelético: análise da anisotropia do músculo gastrocnêmio lateral e relação entre a angulação de fibras musculares e sintéticas e o módulo de cisalhamento
… propagation does not occur completely in the fibers direction in pennate muscles, therefore, anisotropy must be considered when obtained shear modulus (μ) by Supersonic Shear Imaging (SSI) elastography. As the pennation angle (PA) varies between muscles, individuals and dynamic conditions, its …
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Characterization of electrospun DLPLGA nanofibers for a drug delivery system for intracranial tumors and AVMs
… processes apply electric fields to a polymer solution in order to produce strands of polymer in the nanoscale range. These polymer fibers are manipulated for their porosity, high surface area, fineness and uniformity. In order to create the ideal drug delivery system for intracranial …
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Multi-Material Fiber Fabrication and Applications in Distributed Sensing
… and fabricated multi-material electrode-embedded polymer fibers with distributed sensing capabilities. Polymers sensitive to temperature and pressure have been incorporated into the fiber structure, and thin metal electrodes placed inside fiber by convergence drawing have enabled detection of …
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Ultra-lightweight nanorelief networks : photopatterned microframes
Lightweight nano-network structures in polymers have been fabricated and investigated for their mechanical properties. Fabrication techniques via holographic interference lithography and phase mask lithography were implemented for periodic and quasiperiodic bicontinuous polymer-air structures on …
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Biomimetic composite structure to simulate tendon performance
… an elastomeric matrix reinforced with continuous polymer fibers. The matrix material was a thermoplastic polyurethane, Estane 5714 F5P. A polyamide (Nylon 6-6), a polyethylene terephthalate (Dacron) and a block copolymer of polyethylene oxide and aromatic polyurethane (Lycra) were used as the …
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Advanced Dispersion Strategies of Carbon Nanofillers and their use to enhance Mechanical and Electrical Properties of Polyacrylonitrile Fibers
… on making next generation of polyacrylonitrile fibers containing carbon nanofillers, namely carbon nanotubes (CNTs) and carbon black (CB). Mechanically strong and electrically conducting poly(acrylonitrile) (PAN) fibers were obtained by incorporating up to (a) 15 wt% single wall carbon nanotubes …
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Processing and Properties of New Anisotropic and Mechanically Active Polymeric Composites
… and inexpensive method to fabricate micron-sized polymer fibers, and it has been employed in this work to develop highly anisotropic fibrous composites. Previous work has detailed the properties of using electrospinning to fabricate fibrous anisotropic composites that was achieved by embedding …
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