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 22 for “"polymeric coatings"”.
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Measuring/predicting the adhesion of polymeric coatings
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Tribology of polymeric coatings for aggressive bearing applications
… to implement some type of advanced protective coatings on the interacting surfaces to withstand stringent contact conditions. Due to favorable tribological performance, polytetrafluoroethylene (PTFE)- and polyetheretherketone (PEEK)-based polymeric coatings have received interest in ACR …
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Stress development in particulate, nano-composite and polymeric coatings.
… development during the drying of particulate coatings, nano-composite coatings and VOC compliant refinish clearcoats. The results obtained during this research establish the mechanism for the stress development during drying in various coating systems. Coating stress was measured using a …
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Effect of silicon nano particles added to the polymeric coatings
… that the added nano silica diffused into the coatings and embedded underneath the surface. A number of silicon peaks observed with Raman microscope suggested that the coating with added nano silica had slightly higher silicon concentration, as expected. The silicon peaks of almost equal …
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Functionalized Polymeric Coatings for Enhanced Selective Removal of Ions in Electric-Field Driven Processes
… these electrified processes by incorporating polymeric coatings, equipped with functional groups, that can selectively extract target ions. We first looked to improve Ca2+/Na+ selectivity by using a sulfonated polymer (PEDOT:PSS). Through membrane transport property studies and MCDI …
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Characterization of mirco/nano mechanical and tribological properties of polymeric coatings deposited on steel
… and tribological properties of three different polymeric coatings—polyurethane, 2K, and melamine—deposited on steel by analyzing the hardness, elastic modulus, and scratch resistance of each coating. This was accomplished by making indentation and scratch tests on each sample with a …
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The use of thin polymeric coatings to prevent fretting corrosion and metallic contact in steel-on-steel systems
… was conducted to investigate the ability of thin polymeric coatings to prevent metallic contact and fretting corrosion in steel-on-steel systems. Ten polymer types were chosen for study: polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), polyimide (PI), polyvinylidene fluoride (PVDF), …
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The effects of load and humidity on friction and life of polymeric coatings used to prevent fretting corrosion
… and coefficient of friction of five polymer coatings used to protect against fretting corrosion. Chlorine and non-chlorine containing polymers were used in this research to see if the large humidity effect seen in a previous study with polyvinyl chloride is strictly a chlorine related …
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Fundamental studies of the tribological behavior of thin polymeric coatings in fretting contact using infrared and photo/video techniques
… on the behavior of protective anti-fretting coatings (e.g., polymeric) have never been investigated. An oscillating contact device was designed and built to study fretting contact behavior in tribological processes. The contact geometry consisted of a stationary spherical test specimen loaded …
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The effect of molecular weight on the behavior of polystyrene coated steel disks under fretting conditions
Thin polymeric coatings have been applied to metal surfaces to prevent and/or prolong the onset of fretting corrosion, but the properties that make a polymeric coating effective and the means by which a coating fails are unknown. The purpose of this study was to determine the effect of molecular …
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Functionalization of Surfaces Using Photolithography and Other Techniques
… This dissertation investigates two kinds of coatings, polymeric and self-assembled monolayers (SAMs). The polymeric coatings investigated are in the form of photoresists that are used to create substrates for laser ablation. Adjusting the composition of the photoresists leads to the formation …
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Magnetic targeted drug delivery system in gene therapy
… and summarizes the research process of polymeric coating as a function of gene vectors. Nuclear magnetic resonance technology is used to identify the structure of the polymer step by step. At last, the use of PLLA(poly(L lactic acid)) in gene therapy is combined with the MTDDS. The …
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Finite volume modelling of low speed structural impact problems
… of EFVM to simulate impact damage to thin polymeric coatings applied to the surface of metals. The aim of this work is to demonstrate how new simulation methods can help understand coating damage due stone impact. We simulate the debonding phenomenon of single layer coatings under impact by …
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Functionalized multilayer thin films for protection against acutely toxic agents
… generate three novel electrostatically assembled coatings for protection against a range of acutely toxic chemicals, including several chemical warfare agents and toxic industrial compounds. First, Spray-LbL is used to deposit colloidally stable titanium dioxide nanoparticles versus several …
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Theoretical Modeling of Polymeric and Biological Nanostructured Materials
Polymer coatings on periodic nanostructures have facilitated advanced applications in various fields. The performance of these structures is intimately linked to their nanoscale characteristics. Smart polymer coatings responsive to environmental stimuli such as temperature, pH level, and ionic …
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Development of biodegradable implants for sustained drug delivery
… (for example human immunodeficiency virus). Polymeric coatings were developed which prolonged the release from these implants and increased their potential as a drug delivery device for chronic conditions. Sterilisation is an important factor which must be considered when designing a new …
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PH-gated porosity and reversible swelling transitions in polyelectrolyte multilayers
… variables to create molecular-level designed polymeric coatings. The first part of this thesis examines discontinuous pH-induced swelling transitions and reversible memory effects in certain PEMs of poly(allylamine hydrochloride) and (poly(styrene sulfonic acid) (PAH/SPS). It is demonstrated …
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New paradigm to design micro and nano-patterned membranes
… with Initiated Chemical Vapor Deposition; Stiff polymeric coatings form wrinkles when deposited on pre-stretched soft elastomeric substrates. We are showing, both theoretically and experimentally, that the characteristics of these wrinkles can be tuned very easily. Mimicking Nature requires …
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Tribology of engineering and coated materials in the presence of environmentally friendly refrigerant
… lubricated conditions. Current state-of-art polymeric coatings have also been considered for comparative purposes. Tribological and morphological investigations revealed superior tribological performance for ATSP/PTFE. The better performance is attributed to segregated surface morphology …
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DEVELOPMENT AND APPLICATION OF SMART CARBON-BASED COATINGS FOR MULTIFUNCTIONAL SENSING OF CEMENTITIOUS STRUCTURES
… Hence, this research developed carbon-based coatings as innovative, adaptable and scalable self-sensing piezoresistive solutions. While the electrical conductivity of cement paste is influenced by moisture content, cement type and void ratio, small additions of functional fillers can …
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