Surface Initiated Polymerization Of Isoprene From Silica Nano And Glass Particles Via Living Anionic And Controlled Radical Polymerization Techniques
DOWNLOAD
Download Surface Initiated Polymerization Of Isoprene From Silica Nano And Glass Particles Via Living Anionic And Controlled Radical Polymerization Techniques PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Surface Initiated Polymerization Of Isoprene From Silica Nano And Glass Particles Via Living Anionic And Controlled Radical Polymerization Techniques book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Surface Initiated Polymerization Of Isoprene From Silica Nano And Glass Particles Via Living Anionic And Controlled Radical Polymerization Techniques
DOWNLOAD
Author : Onur Kir
language : en
Publisher:
Release Date : 2013
Surface Initiated Polymerization Of Isoprene From Silica Nano And Glass Particles Via Living Anionic And Controlled Radical Polymerization Techniques written by Onur Kir and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Nanoparticles; nanocomposites; glass particles; living anionic polymerization; controlled radical polymerization; RAFT; NMP; silica; isoprene; rubber
Polym Res Empreintes Mol Culaires Et Nano Composites Par Polym Risation Radicalaire Et Radicalaire Contr L E
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2010
Polym Res Empreintes Mol Culaires Et Nano Composites Par Polym Risation Radicalaire Et Radicalaire Contr L E written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This thesis is organized in three chapters and is based on three published papers, and two manuscripts about to be submitted. Molecularly imprinted polymers (MIPs) are tailor-made synthetic receptors that are obtained by polymerization in the presence of a molecular template. The first paper describes the use of Raman spectroscopy to detect and quantify the presence of the imprinting template in single molecularly imprinted polymer microspheres. The polymers were imprinted with the Beta-blocking drugs propranolol and atenolol, and precipitation polymerization was used to obtain spherical particles. The nanoparticles were used for bulk detection whereas with micrometer-sized particles, quantitative measurements on single particles were possible. Relatively low detection limits down to 1μM have been reached for the detection of S-propranolol through bulk measurements on MIP nanoparticles. The second paper describes chemical nanosensors with a submicron core-shell composite design, based on a polymer core, a molecularly imprinted polymer (MIP) shell for selective analyte recognition, and an interlayer of gold nanoparticles for signal amplification. SERS measurements on single nanosensors yielded a detection limit of 10-7 M for the Beta-blocker propranolol, several orders of magnitude lower than on plain MIP spheres. These particles were also used as sensor materials with localized surface plasmon resonance measurements as the transduction method (Paper III), for the determination of the Beta-blocking drug propranolol. The sensors were used in suspension and were measured using a standard UV-Vis spectrophotometer. In order to solve general problems associated with MIPs, in particular their heterogeneity in terms of inner morphology and distribution of binding site affinities, it has been suggested to use modern methods of controlled/living radical polymerization for their synthesis. This also facilitates their generation in the form of nanomaterials, nanocomposites, and thin films, a strong recent trend in the field. The fourth paper reviews recent advances in the molecular imprinting area, with special emphasis on the use of controlled polymerization methods, their benefits, and current limitations. In the last paper, we have for the first time used a recently developed CRP method based on iodide mediated polymerization, reversible chain transfer catalyzed polymerization (RTCP), for the synthesis of MIPs. We show on the example of MIPs specific for the Beta-blocking drug propranolol that RTCP is compatible with MIP synthesis, both for the synthesis of bulk polymers and nanospheres, and that it yields polymers with the same binding capacity as the standard FRP method used for comparison. Solid-state NMR measurements revealed that the conversion of pendant vinyl groups was higher with RTCP than with polymers synthesized by FRP, in particular at higher initiator concentrations.
Stereospecific Polymerization Of Isoprene
DOWNLOAD
Author : Elena Ceaușescu
language : en
Publisher:
Release Date : 1983
Stereospecific Polymerization Of Isoprene written by Elena Ceaușescu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Science categories.
Living Controlled Polymerization Conducted In Aqueous Based Systems
DOWNLOAD
Author : Ryan W. Simms
language : en
Publisher:
Release Date : 2007
Living Controlled Polymerization Conducted In Aqueous Based Systems written by Ryan W. Simms and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
In the last decade processes known as living/controlled radical polymerizations (L/CRP) have been developed which permit the synthesis of high-value specialty polymers. Currently, the three processes that have demonstrated the most potential are: reverse addition fragmentation chain transfer polymerization (RAFT), atom transfer radical polymerization (ATRP) and stable free radical polymerization (SFRP). While each process has their strengths and weaknesses with regard to specific polymers and architecture, the viability of these systems to industrial scale production all lie in the ability to perform the polymerization in a water based system because of process, environmental and economic advantages. The most effective method of controlling the polymerization of vinyl acetate in bulk has been RAFT. We have developed a miniemulsion RAFT polymerization using the xanthate methyl (ethoxycarbonothioyl)sulfanyl acetate. The miniemulsion is stabilized with 3 wt% sodium lauryl sulfate, initiated with the azo-based water-soluble VA-060. The main focus of this research was adapting ATRP to a miniemulsion system. It was determined that ionic surfactants can be successfully employed in emulsion-based ATRP. The cationic surfactant cetyltrimethylammonium bromide provides excellent stability of the latex over a range of surfactant loadings (allowing the particle size to be easily manipulated), at temperatures up to 90 C, for a wide variety of ATRP formulations. A new method of initiation was developed for reverse ATRP, using the redox pair hydrogen peroxide/ascorbic acid. This nearly eliminated the induction period at the start of the polymerization, increased the polymerization rate 5 fold and, surprisingly, enabled the formation of well-controlled polymers with a number-average molecular (Mn) weight approaching 1 million (typically ATRP is limited to ~200 000). The ability to control the particle size and the number of polymer chains (through the target Mn) over a wide range of values allowed us to determine that ATRP is influenced by compartmentalization effects. The knowledge gained from our work in L/CRP was used to develop the surfactant-free SFRP of styrene. A multi-stage approach was adopted starting from dilute styrene/water solutions to favor the formation of the alkoxyamine and short chain SG1-oligomers (stage one) before the addition of the majority of the styrene (stage two).
Anionic Polymerization
DOWNLOAD
Author : Nikos Hadjichristidis
language : en
Publisher: Springer
Release Date : 2015-09-14
Anionic Polymerization written by Nikos Hadjichristidis and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-14 with Technology & Engineering categories.
This book presents these important facts: a) The mechanism of anionic polymerization, a more than 50-year challenge in polymer chemistry, has now become better understood; b) Precise synthesis of many polymers with novel architectures (triblock, multi-block, graft, exact graft, comb, cyclic, many armed stars with multi-components, dendrimer-like hyper-branched, and their structural mixed (co)polymers, etc.) have been advanced significantly; c) Based on such polymers, new morphological and self-organizing nano-objects and supra molecular assemblies have been created and widely studied and are considered nanodevices in the fields of nano science and technology; d) New high-tech and industrial applications for polymeric materials synthesized by anionic polymerization have been proposed. These remarkable developments have taken place in the last 15 years. Anionic polymerization continues to be the only truly living polymerization system (100 % termination free under appropriate conditions) and consequently the only one with unique capabilities in the synthesis of well-defined (i.e., precisely controlled molecular weight, nearly mono-disperse molecular weight distribution, structural and compositional homogeneity) complex macromolecular architectures. This book, with contributions from the world’s leading specialists, will be useful for all researchers, including students, working in universities, in research organizations, and in industry.
Controlled Radical Polymerization By The Electrochemically Active Bacteria Shewanella Oneidensis
DOWNLOAD
Author : Gang Fan
language : en
Publisher:
Release Date : 2019
Controlled Radical Polymerization By The Electrochemically Active Bacteria Shewanella Oneidensis written by Gang Fan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Atom transfer radical polymerization (ATRP) has emerged as a robust tool to synthesize soft materials with defined structures for bioengineering and nanocomposites. In the past decade, numerous efforts were devoted to developing a novel polymerization method, electrochemically controlled radical polymerization (eATRP), which requiring less catalysts. However, due to restriction of special design, susceptible to oxygen and less control in aqueous buffers, challenges still remain. To address these difficulties, we hypothesized extracellular electron transfer from micro-oganisms could be utilized to control the performance of an exogenous oxidation-reduction (redox) reaction. We show that the electroactive bacterium Shewanella oneidensis can control the activity of a copper catalyst in ATRP. Precise control over the molecular weight and polydispersity of synthetic polymer could be achieved by mixing the bacterial suspension into the reaction medium. We also found that catalyst performance could be augmented by specific electron transport proteins and bacterial metabolism, offering potential targets for future applications. Performing ATRP under air is almost impossible because oxygen will quench the polymerization. We show that S. oneidensis can control metal-catalyzed living radical polymerizations under aerobic conditions by first consuming dissolved oxygen via aerobic respiration, then directing extracellular electron flux to the polymerization catalysts. In both open and closed containers, S. oneidensis enabled living radical polymerizations without requiring the pre-removal of oxygen. Polymerization activity was effective for wide ranges of monomers using low concentrations of biocompatible metal catalysts including Fe and Co. Moreover, polymerizations could be initiated using lyophilized or spent (recycled) cells. Finally, in order to understand the surface chemistry of metal organic frameworks (MOFs), we develop a surface functionalization method for water-stable MOFs by phage display. Specific frameworks binding peptides were identified, and their thermodynamic binding affinities and specificities were measured. Microscopy, X-ray diffraction, and gas adsorption analysis confirmed that the peptide functionalized frameworks retained similar characteristics. Microcopy imaging technique showed that peptide was localized on the surface of the frameworks, without blocking pore of MOFs. Last but not least, we measured the pH-dependent release of fluorescein from peptide-functionalized frameworks and discovered that peptide-binding can attenuate fluorescein release by improving framework stability under low pH conditions
Radical Polymerization
DOWNLOAD
Author : Irena O. Paulauskas
language : en
Publisher:
Release Date : 2012
Radical Polymerization written by Irena O. Paulauskas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Free radical reactions categories.
In this book, the authors present topical research on new developments in radical polymerization. Topics discussed include interface radical reactions of functional polyperoxides for fabrication of three-dimensional polymeric structures; biomacromolecules in radical processes; nitroxide-mediated photo controlled/living radical polymerisation; alkaline anion-exchange membranes prepared by plasma polymerisation; advancements in controlled radical polymerisation for functional polymers; and thermal redox and photoinduced ring opening polymerisation reactions.
Controlled Living Radical Polymerization
DOWNLOAD
Author : Krzysztof Matyjaszewski
language : en
Publisher:
Release Date : 2009
Controlled Living Radical Polymerization written by Krzysztof Matyjaszewski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Language Arts & Disciplines categories.
Recent progress in the field of controlled/living radical polymerization.
Cu0 Catalyzed Surface Initiated Controlled Radical Polymerization Of 2 Hydroxyethyl Methacrylate
DOWNLOAD
Author : Joan Jornod
language : en
Publisher:
Release Date : 2015
Cu0 Catalyzed Surface Initiated Controlled Radical Polymerization Of 2 Hydroxyethyl Methacrylate written by Joan Jornod and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Ionic Polymerizations And Related Processes
DOWNLOAD
Author : Judit E. Puskas
language : en
Publisher: Springer Science & Business Media
Release Date : 1999
Ionic Polymerizations And Related Processes written by Judit E. Puskas and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Science categories.
In Ionic Polymerization and Related Processes, internationally recognised academic and industrial researchers discuss and debate the latest developments in the field. The major focus is on cationic polymerizations, but related anionic and controlled radical processes are also discussed.