Controlled Radical Polymerization With Dendrimers Containing Stable Radicals

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Controlled Radical Polymerization with Dendrimers Containing Stable Radicals

Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Controlled Radical Polymerization with Dendrimers Containing Stable Radicals by :

Download or read book Controlled Radical Polymerization with Dendrimers Containing Stable Radicals written by and published by . This book was released on 1996 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: TEMPO-based stable radicals were attached to dendrimers of variable size and used to control radical polymerization of styrene, vinyl acetate and (meth)acrylates. Thermal polymerization of styrene with (G-2)-TEMPO proceeded in a similar but not better controlled manner than with TEMPO alone. In the polymerization of styrene initiated with BPO, the kinetics and the molecular weigh/conversion relations showed the same tendency as with TEMPO, though the polydispersity was higher than in the absence of dendrimers. This indicates that homolytic cleavage occurs at the reaction temperature, monomer can diffuse inside the cavity of dendrimer, and polymer is at least partially compatible with dendrimer. Model reactions indicate that the higher observed polydispersities could not be ascribed to transfer to benzyl hydrogen atoms. Therefore, the higher polydispersities could originate from the self-initiated polymerization of styrene outside of the dendrimers as well as the slow exchange of these chains with chains attached to dendrimers. To evaluate the effect of self-initiation, vinyl acetate, methyl methacrylate, and n-butyl acrylate were used, however, the resulting polymers were incompatible with the dendrimers. The growing chains are easily released from the cavity of the dendrimers into solution, and their return into the cavities of the dendrimers was not fast enough to control the polymerization. The results of the polymerization in decalin solution indicate that polymerization of these monomers is better controlled but only at the early stages of the polymerizations. The subsequent precipitation of polymers attached to the dendrimers prevent further polymerization.

Controlled/living Radical Polymerization

Author : Krzysztof Matyjaszewski
Publisher : Academic
ISBN 13 :
Total Pages : 444 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Controlled/living Radical Polymerization by : Krzysztof Matyjaszewski

Download or read book Controlled/living Radical Polymerization written by Krzysztof Matyjaszewski and published by Academic. This book was released on 2009 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent progress in the field of controlled/living radical polymerization.

5-substituted Triazolinyls as Novel Counter Radicals in Controlled Radical Polymerization

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (697 download)

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Book Synopsis 5-substituted Triazolinyls as Novel Counter Radicals in Controlled Radical Polymerization by :

Download or read book 5-substituted Triazolinyls as Novel Counter Radicals in Controlled Radical Polymerization written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The work is devoted to synthesis of new triazolinyl stable radical derivatives with different substituents at the 5-position of the triazolinyl ring. Obtained results showed great influence of these substituents on the stability of the radical. Electron-rich aromatic substituents at this position stabilize the radical while electron-poor aromatics decrease the stability of the triazolinyl. The triazolinyl radicals synthesized were used as additives for kinetic investigations of controlled radical polymerization of styrene and methylmethacrylate (MMA). The studies performed showed that the more stable radicals provide better control for the polymerization of styrene. In the same time certain instability of the radical is required for realization of controlled polymerization of methylmethacrylate. Based on the kinetic investigations controlled radical polymerization of a variety of monomers including 4-vinylpyridine (4-VP), ethylmethacrylate (EMA), 2,2,2-trifluoroethylmethacrylate (FEMA) and n-butylmethacrylate (BMA)was successfully carried out. Polystyrene and polymethylmethacrylate macroinitiators prepared by triazolinyl mediated controlled radical polymerization were efficiently reinitiated in the presence of a variety of monomers leading to the formation of block copolymers. Using this method PS-b-P-4-VP, PMMA-b-PS, PMMA-b-PBMA, PMMA-b-PFEMA, and PMMA-b-Poly-tert-butylacrylate were successfully synthesized. The results obtained during this work showed the efficiency and flexibility of the method allowing preparation of a range of advanced macromolecular structures.

Dendrimers

Author : Anne-Marie Caminade
Publisher : John Wiley & Sons
ISBN 13 : 1119977576
Total Pages : 764 pages
Book Rating : 4.1/5 (199 download)

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Book Synopsis Dendrimers by : Anne-Marie Caminade

Download or read book Dendrimers written by Anne-Marie Caminade and published by John Wiley & Sons. This book was released on 2011-08-31 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will be mainly focussed on the properties and uses of dendrimers and dendrons. The aim of this book is to be the reference book about dendrimers applications. It will not describe all details, but it will give the reader a unique overview of what has currently been done with dendrimers, with numerous references and illustrations. It will be divided in four main parts: Part 1) Generalities, syntheses, characterizations and properties; Part 2) Applications in catalysis; Part 3) Applications for the elaboration or modification of materials; and Part 4) Applications in biology/medicine. The role of the nanometric size and the multiple functions of dendrimers on the properties will be emphasized.

"Living"/controlled Radical Polymerization

Author : Delphine Chan-Seng
Publisher :
ISBN 13 : 9780494278895
Total Pages : 306 pages
Book Rating : 4.2/5 (788 download)

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Book Synopsis "Living"/controlled Radical Polymerization by : Delphine Chan-Seng

Download or read book "Living"/controlled Radical Polymerization written by Delphine Chan-Seng and published by . This book was released on 2007 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emulsion polymerization is an important process for the industrial production of polymers. However, initial attempts at performing "living"/controlled radical polymerization under emulsion conditions were not particularly successful primarily due to latex instability. To address this problem a unique nanoprecipitation process was developed in our laboratory for the stable free radical polymerization (SFRP) process. The first part of this thesis describes attempts to generalize this process and extend it to the copper based atom transfer radical polymerization, ATRP, process. Details describing initial problems we had with reproducing some initial successful results are provided. Once the process was under control it was used to synthesize block copolymers. The ability of these block copolymers to self-assemble in aqueous solutions and in bulk were subsequently investigated and the results of these studies are detailed at the end of the discussion on the emulsion process. The second part of the thesis deals with the SFRP process and more specifically with the difficulty of the process to moderate the polymerization of acrylates. Two reasons have been advanced to account for this difficulty; a high bond dissociation energy between the C-O bond linking the nitroxide moiety to the end of the polymer chain and an accumulation of excess nitroxide, caused by unavoidable chain termination, which causes inhibition of the polymerization. To address the high bond dissociation energy a nitroxide, specifically, 1,1'-diadamantyl nitroxide, containing very bulky substituents that might cause the bond to weaken, was synthesized and studied. To address the accumulation of excess free nitroxide, high temperature additives, that would slowly dissociate over time and consume the excess nitroxides, were studied. The results of both of these approaches are provided enabling some insight into what might be actually restricting the polymerization of acrylates.

Smart Polymers and their Applications

Author : Maria Rosa Aguilar
Publisher : Elsevier
ISBN 13 : 0857097024
Total Pages : 587 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Smart Polymers and their Applications by : Maria Rosa Aguilar

Download or read book Smart Polymers and their Applications written by Maria Rosa Aguilar and published by Elsevier. This book was released on 2014-02-19 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart polymers are polymers that respond to different stimuli or changes in the environment. Smart Polymers and their Applications reviews the types, synthesis, properties, and applications of smart polymers. Chapters in part one focus on types of polymers, including temperature-, pH-, photo-, and enzyme-responsive polymers. Shape memory polymers, smart polymer hydrogels, and self-healing polymer systems are also explored. Part two highlights applications of smart polymers, including smart instructive polymer substrates for tissue engineering; smart polymer nanocarriers for drug delivery; the use of smart polymers in medical devices for minimally invasive surgery, diagnosis, and other applications; and smart polymers for bioseparation and other biotechnology applications. Further chapters discuss the use of smart polymers for textile and packaging applications, and for optical data storage. Smart Polymers and their Applications is a technical resource for chemists, chemical engineers, mechanical engineers, and other professionals in the polymer industry; manufacturers in such sectors as medical, automotive, and aerospace engineering; and academic researchers in polymer science. - Reviews the different types of smart polymer, discussing their properties, structure, design, and characterization - Reviews applications of smart polymers in such areas as biomedical engineering, textiles, and food packaging

Functional Controlled/Living Radical Polymers

Author : Vivek Mishra
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659355776
Total Pages : 132 pages
Book Rating : 4.3/5 (557 download)

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Book Synopsis Functional Controlled/Living Radical Polymers by : Vivek Mishra

Download or read book Functional Controlled/Living Radical Polymers written by Vivek Mishra and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a good understanding of the progress being made in controlled radical polymerization process. The basic principle of controlled/living radical polymerization is fundamental to the creation of new radical polymerization techniques including atom transfer radical, and reversible addition-fragmentation transfer polymerization. These discoveries bring new life to the field of free radical polymerization; indeed, an abundance of polymer materials with different topologies have been prepared. I hope that this Special Topic on "Functional Controlled/Living Radical Polymers: Synthesis, Kinetics and Physico-chemical Properties" will cultivate new ideas and catalyze discoveries in every reader's laboratory. This book is aimed to provide information related to the newest controlled radical polymerization methodology, ATRP and RAFT, their required components and their advantages and necessities. I demonstrates that how simple molecule selectively arrange as different topology like linear, star, multi arm polymers containing functional groups for various applications.

Dendrimers and Dendrons

Author : George Richard Newkome
Publisher : Wiley-VCH Verlag GmbH
ISBN 13 :
Total Pages : 648 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Dendrimers and Dendrons by : George Richard Newkome

Download or read book Dendrimers and Dendrons written by George Richard Newkome and published by Wiley-VCH Verlag GmbH. This book was released on 2001 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: What's new in dendrimer research? Just as these fascinating giant molecules are continuing to ramify, new perspectives and challenges continue to emerge. This bestseller on dendritic molecules discusses the latest developments in the synthesis and application of these macromolecules. It gives a comprehensive, up-to-date account of the topic, from the historical overview and theoretical background up to the most recent achievements. Having shaped this scientific field, the authors are able to brilliantly combine the basic principles with a wealth of more advanced information. The optimal presentation of the structural features of dendrimers helps readers to quickly understand even sophisticated syntheses. For special synthetic problems, the well-selected, detailed list of references allows easy access to further literature. This monograph will undoubtedly prove to be of interest for both beginners and advanced scientists in organic and pharmaceutical chemistry, as well as material science.

Reversible Deactivation Radical Polymerization

Author : Nikhil K. Singha
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110643693
Total Pages : 302 pages
Book Rating : 4.1/5 (16 download)

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Book Synopsis Reversible Deactivation Radical Polymerization by : Nikhil K. Singha

Download or read book Reversible Deactivation Radical Polymerization written by Nikhil K. Singha and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-01-20 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes strategies and mechanism of reversible deactivation radical polymerization (RDRP) to synthesize functional polymers. Several approaches such as atom transfer radical polymerization and the combination of click chemistry and RDRP are summarized. Contributors from interdisciplinary fields highlight applications in nanotechnology, self-healing materials, oil and water resistant coatings and controlled drug delivery systems.

Hyperbranched Polydendrons

Author : Fiona L. Hatton
Publisher : Springer
ISBN 13 : 3319187538
Total Pages : 279 pages
Book Rating : 4.3/5 (191 download)

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Book Synopsis Hyperbranched Polydendrons by : Fiona L. Hatton

Download or read book Hyperbranched Polydendrons written by Fiona L. Hatton and published by Springer. This book was released on 2015-05-18 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis outlines the first synthesis of a new complex branched polymer architecture that aims to combine the benefits of dendrimers with the simplicity of conventional polymerisation. There is no other available literature on these remarkable materials, dubbed hyperbranched polydendrons, due to their novelty. The new materials were shown to have very high molecular weights (>1,000,000 g/mol), exceptional self-assembly and encapsulation behaviour and unparalleled functionalisation capabilities, and were studied pharmacologically to determine their potential as oral nanomedicine candidates. The detailed investigation of the chemical variables involved in synthesising hyperbranched polydendrons has shown that their self-assembly and pharmacological behaviour can be turned on and off and fine-tuned by altering the composition of the materials. The permeation of the self-assembled particles through model gut epithelium suggests the potential for oral dosing of drug loaded nanomedicines that result in circulating nanoparticles – a research goal that is currently being pursued by several groups around the globe.

Advances in Controlled/living Radical Polymerization

Author : Krzysztof Matyjaszewski
Publisher :
ISBN 13 :
Total Pages : 712 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Advances in Controlled/living Radical Polymerization by : Krzysztof Matyjaszewski

Download or read book Advances in Controlled/living Radical Polymerization written by Krzysztof Matyjaszewski and published by . This book was released on 2003 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Controlled/Living Radical Polymerization presents new developments in controlled/living radical polymerization in three areas: atom transfer radical polymerization (ATRP), nitroxide mediated polymerization (NMP), and reversible addition-fragmentation transfer (RAFT). This book also includes synthesis and characterization of many new materials.

Controlled Radical Polymerization

Author : Krzysztof Matyjaszewski
Publisher :
ISBN 13 :
Total Pages : 504 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Controlled Radical Polymerization by : Krzysztof Matyjaszewski

Download or read book Controlled Radical Polymerization written by Krzysztof Matyjaszewski and published by . This book was released on 1998 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent work in polymer chemistry has allowed scientists to control the polymerization reaction and produce increasingly well-defined polymers. This volume examines current work in the field and describes the synthesis of new materials. It includes discussions of nitroxide-mediated and metal-mediated radical polymerizations. It also includes an overview of the fundamentals of radical chemistry, making it accessible to a wide range of chemists and materials scientists.

Controlled/living Radical Polymerization

Author : Krzysztof Matyjaszewski
Publisher :
ISBN 13 :
Total Pages : 506 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Controlled/living Radical Polymerization by : Krzysztof Matyjaszewski

Download or read book Controlled/living Radical Polymerization written by Krzysztof Matyjaszewski and published by . This book was released on 2000 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines recent progress in controlled/living radical polymerization. The volume focuses on three synthetic methods: atom transfer radical polymerization, nitroxide mediated polymerization and degenerative transfer via addition fragmentation. In addition, the volume covers the preparation and characterization of many never before seen materials using ATRP, NMP and RAFT.

Radical Polymerization

Author : Michael Buback
Publisher : John Wiley & Sons
ISBN 13 : 3527320563
Total Pages : 270 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Radical Polymerization by : Michael Buback

Download or read book Radical Polymerization written by Michael Buback and published by John Wiley & Sons. This book was released on 2007-07-16 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IUPAC-sponsored International Symposium on "Radical Polymerization: Kinetics and Mechanism" was held in Il Ciocco (Italia) during the week September 3-8, 2006. It was the fourth within the series of so-called SML conferences, which are the major scientific forum for addressing kinetic and mechanistic aspects of free-radical polymerization and of ontrolled radical polymerization. Top international authors like K. Matyjaszewski, T. P. Davis, T. Fukuda and others present their latest research. The five major themes covered were: Fundamentals of Free-Radical Polymerization, Heterogeneous Polymerization, Controlled Radical Polymerization, Polymer Reaction Engineering, and Polymer Characterization. SML IV again marked an important step forward toward the better understanding of the kinetics and mechanism of radical polymerization, which is extremely relevant for both conventional and controlled radical polymerization and for people in academia as well as in industry.

Radical Polymerization: Kinetics and Mechanism

Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736919913
Total Pages : 176 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Radical Polymerization: Kinetics and Mechanism by :

Download or read book Radical Polymerization: Kinetics and Mechanism written by and published by Cuvillier Verlag. This book was released on 2006-08-22 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Synthesis of Well Defined Polymers by Radical Polymerization

Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Synthesis of Well Defined Polymers by Radical Polymerization by :

Download or read book Synthesis of Well Defined Polymers by Radical Polymerization written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several approaches to synthesis of polymers with controlled molecular weights, desired end groups and low polydispersities, by controlled radical polymerization are discussed. The first one is based on nitroxyl radicals such as TEMPO which can react reversibly with propagating radicals. The position of the equilibrium constant depends on the nature of the radical, solvent and temperature. Polymerization rates in systems involving polar monomers (methyl methacrylate, methyl acrylate, vinyl acetate) are higher than in systems based on non-polar monomers (styrene). Other systems involve persistent organometallic-based radicals or hypercoordinated organic radicals as dormant species, in equilibrium with propagating macroradicals.

Advanced ESR Methods in Polymer Research

Author : Shulamith Schlick
Publisher : John Wiley & Sons
ISBN 13 : 0470053496
Total Pages : 300 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Advanced ESR Methods in Polymer Research by : Shulamith Schlick

Download or read book Advanced ESR Methods in Polymer Research written by Shulamith Schlick and published by John Wiley & Sons. This book was released on 2006-10-06 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: A definitive work on ESR and polymer science by today's leading authorities The past twenty years have seen extraordinary advances in electron spin resonance (ESR) techniques, particularly as they apply to polymeric materials. With contributions from over a dozen of the world's top polymer scientists, Advanced ESR Methods in Polymer Research is the first book to bring together all the current trends in this exciting field into one comprehensive reference. Part I establishes the fundamentals of ESR, from experimental techniques to data analysis, and serves as a valuable overview for the beginning ESR student. Part II introduces the broad range of ESR applications to polymeric systems, including living radical polymerization, block copoly-mers, polymer solutions, ion-containing polymers, polymer lattices, membranes in fuel cells, degradation, polymer coatings, dendrimers, and conductive polymers. By exposing readers to the great potential of ESR, the authors hope to encourage more extensive application of these methods.