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Showing 1 to 17 of 17 for “"polymer modification"”.
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Robust Processes for Polymer Modification and Pharmaceutical Synthesis
… 1: Continuous Dimethyldioxirane Generation for Polymer Epoxidation Post-polymerization modification of commodity polymers yields new applications for materials already produced industrially. Incorporation of small amounts of epoxides into unsaturated polymers such as polybutadiene expands their …
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Correlation between multiple stress creep recovery (MSCR) results and polymer modification of binder
… by the heavy use of the Northeast Corridor. Polymer modification of asphalt, which can improve both low and high temperature performance, is already available; however, but in many cases traditional Superpave testing is not sensitive enough to quantify the impact of modification, dimensioning …
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Optimising Recording & Stimulation Performance of Neuronal Microelectrode Arrays through Macroporous Conducting Polymer Modification
… maintaining the desired geometric area involve modification with rough, conductive electrode coatings, such as conducting polymers (CPs). This research aims to investigate a macroporous templated CP based on poly(3,4-ethylenedioxythiophene)/polystyrene sulphonate (PEDOT/PSS) hypothesised to …
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Test Development and Material Characterization of Hot Poured Crack Sealant at Low Temperature
… of the microstructure analysis show that with polymer modification, the low temperature tensile property of the sealant improves. However, if the ground tire rubber (GTR) is added, the improvement of tensile property is reduced, but the flexural strength is increased.
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Nano-scale evaluation of moisture damage in asphalt
… samples are tested after wet conditioning. Polymer is almost an essential component of asphalt binders now-a-days. However it is not known whether polymer modification helps reduce moisture damage potential of asphalt. Therefore, both base binder and polymer modified asphalt binder are …
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Exploring the Black Space of Compressive and Shear Modulus
… and the other three were modified with polymers and acids. Additionally, Polyphosphoric acid (PPA) is compared to the more traditional SBS polymer modification. PPA is currently prohibited in Arkansas because of a lack of information on its field performance. Three tests were performed: …
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METAL-FREE SELECTIVE SP3 C-H IMINATION AND COVALENT POSTSYNTHETIC MODIFICATION OF POLYSTYRENE BY DIRECT C-H AMINATION
… can improve the properties of commodity polymers. Transition-metal-catalyzed C–H amination has emerged as a powerful tool for C–N bond formation, but these reactions typically rely on nitrogen protecting groups such as sulfonamides, which limits substrate scope and requires multiple …
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Plastic Waste-Derived CO2 Sorbents and Methods for Enhanced Selectivity and Stability
… of plastic-derived sorbents, an amine-containing polymer, polyethylenimine (PEI), was added to the carbon sorbent in Chapter 4. To do this, we first modulated the pore structure of the sorbent to become more mesoporous through a liquid-salt templating mechanism. More mesoporosity allowed better …
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Design and Characterization of Central Functionalized Asymmetric tri-Block Copolymer Modified Surfaces
… central functionalized asymmetric tri-block copolymers (CFABC) were designed as a new type of polymer brush surface modifier, with a short central functionalized block that can form chemical bonds with a suitable substrate surface. A combination of sequential living anionic polymerization and …
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Synthesis and Blend Behaviour of Multi-End Capped Polyethylene
There is an ever-growing need for polymers with specific surface properties for the production of modified materials. Recently, extremely efficient polymer surface modification has been achieved by incorporating dendritically end functionalised polymers into blends, which combine sufficient …
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Investigation of Fatigue Properties of Superpave HMA at the Virginia Smart Road
… strain-life fatigue equations, the benefits of polymer-modification of binders and use of SMA were shown for mixtures produced in the laboratory according to the job mix formula and to match the plant-produced volumetrics. Evaluation of the predicted fatigue strain endurance limit was performed …
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Asphalt mixture evaluation using performance space diagrams, digital image correlation, and discrete element modeling
… such as styrene butadiene styrene (SBS) polymer, bio-modifiers, and warm mix asphalt processes, and recycled asphalt materials, such as recycled asphalt pavement (RAP) and shingles (RAS), have limited long term field performance data. As a result, traditional and enhanced laboratory …
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Deposition of Electroactive Polymers onto Polymer Nanofibers for Nerve Regeneration
… Electrospinning of the biocompatible polymer polycaprolactone (PCL) is used to produce porous and ordered nanofibers that resemble the structure and organization of the extracellular matrix, providing a suitable environment to promote the adhesion and directional growth of nerves. …
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Chain-end functionalization and modification of polymers using modular chemical reactions
… in both α and ω chain-ends of synthetic polymers. These functionalized polymers could then go through modular synthetic pathways such as click cycloaddition (copper-catalyzed or copper-free) or amidation to couple synthetic polymers to other synthetic polymers, biomolecules or silica …
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Synthesis and Characterization of Tailored Macromolecules via Stable Free Radical Polymerization Methodologies
The stable free radical polymerization methodology for production of controlled macromolecules was investigated using a novel monomer, 2-vinylnaphthalene. Initial polymerizations resulted in molecular weight distributions typical of conventional free radical polymerization techniques (>2.0). …
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Synthese und Charakterisierung von Polymerbürsten-Oberflächen mit Gradienten und Strukturierung (Synthesis and characterization of patterned and gradient polymer brush surfaces)
… of general methods of preparation of tethered polymer layers with laterally changing properties and investigation of their properties with focus on controlled adsorption and liquid flow. The temperature dependent character of the grafting reaction is used for the design of mono- and bicomponent …