Download or read book Synthesis and Characterization of Gradient Hyperbranched Copolymers by Atom Transfer Radical Polymerization written by and published by . This book was released on 2000 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of linear and (hyper)branched polymers possessing varying compositions using atom transfer radical polymerization (ATRP) was conducted. The synthesis of linear random and gradient copolymers from styrene/n-butyl acrylate and methyl methacrylate/n-butyl acrylate systems were evaluated by studying the copolymerization kinetics of the respective monomers pairs in ATRP. Development in the preparation of materials with advanced architectures was achieved by the synthesis of novel hyperbranched polymers using the self-condensing vinyl polymerization (SCVP) by ATRP. Subsequent end-group transformation reactions of these hyperbranched polymers yielded low viscosity materials with reactive functionalities. Additionally, novel highly branched nanocomposites were also prepared by the use of a functional colloid (diameter = 15 nm) as a macroinitiator for the synthesis of homo- and block copolymers tethered to a particle surface.
Download or read book Synthesis and Characterization of Functional Amphiphilic Gradient Copolymers by Atom Transfer Radical Polymerization written by Sandra Schwitke and published by . This book was released on 2014 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Living and Controlled Polymerization written by Joseph Jagur-Grodzinski and published by Nova Publishers. This book was released on 2006 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: The living/controlled polymerisation techniques opened new vistas in polymer chemistry. The leading authorities in this field and its pioneers contributed chapters to this collective volume. The controlled polymerisation techniques have enabled preparation of polymers, copolymers, and block copolymers with predetermined molecular weights and narrow polydispersity, in which functional groups or biologically active molecules could be placed at well defined locations. They have also enabled preparation of advanced polymeric structures with precisely determined architectures and improved properties. Moreover, they have provided opportunities for preparation of novel polymeric materials from monomers, which before have not been suitable or accessible for such purposes. Properties of some of these polymeric materials may be significantly different from those of the existing ones. They provide opportunities for new applications. Several patents have already been approved for such speciality applications as, drug delivery, biocompatible surfaces, thermoplastic elastomers, moisture curable sealants, and so on. Many more products, based on polymers fabricated by the living/ controlled polymerisation techniques, will certainly emerge in such specialised areas as, nanotechnology, medical devices, "smart polymers", sensors , smart separation technologies, optical fibres and other optical applications, various biomaterials, etc.
Download or read book Statistical Gradient Block and Graft Copolymers by Controlled Living Radical Polymerizations written by Kelly A. Davis and published by Springer Science & Business Media. This book was released on 2007-11-02 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design and the realisation of well defined polymer architectures has become an important goal in macromolecular science. The prerequisite for achieving this goal is the availability of controlled polymerisation reactions. Living anionic polymerisation was the first reaction fulfilling these requirements. Cationic polymerisation only came into play when it was realised that it was possible to create an equilibrium between active and dormant species with the fraction of the dormant species being far superior to that of active ones. A corresponding principle applies to controlled radical polymerisation per formed in quite a number of modes such as nitroxide mediated polymerisation (NMP), atom transfer radical polymerisation (ATRP), reversible addition frag mentation chain transfer (RAFT) or catalytic chain transfer (CCT) reactions. All of these variants of controlled radical polymerisation lead to well defined archi tectures with the particular advantage that a much larger number of monomers are suitable and the reaction conditions are much less demanding than those of living ionic polymerisation reactions. Although in controlled radical polymerisation, termination reactions cannot be excluded completely, they are limited in their extent and consequently the mol ecular weight is controlled, the polydispersity index is small and functionalities can be attached to the macromolecules. These features are indicative of the real isation of well defined polymer architectures such as block copolymers, star shaped and comb shaped copolymers.
Download or read book Synthesis and Characterization of Gradient Copolymers Made by Semi batch Reversible deactivation Radical Polymerizations written by Ishah Hadi Mohammed Alshehri and published by . This book was released on 2019 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Novel Gradient Copolymers Via Atom Transfer Radical Polymerization written by Dorota Greszta and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Synthesis written by Guojian Wang and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-11-23 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book systematically presents fundamental principles, properties, implementation methodologies, technologies and applications of polymer synthesis. Ring opening metathesis polymerization, click chemistry, macromolecular self-assembly, carbon nanomaterials and their modification with polymers are discussed in detail. With abundant illustrations, it is an essential reference for polymer chemists, material scientists, and graduate students.
Download or read book Handbook of Radical Polymerization written by Krzysztof Matyjaszewski and published by John Wiley & Sons. This book was released on 2002-08-08 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Provides a concise source of information on synthetic techniques, purification, and characterization methods for free-radical polymers. * Presents information on future trends in the synthesis of free-radical polymers.
Download or read book Synthesis and Characterization of Stimuli responsive Polymers with Aqueous Atom Transfer Radical Polymerization written by Collin N. Britten and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Well Defines ABC Type Triblock Copolymers Via Atom Transfer and Stable Free Radical Polymerization written by Tuba Erdoğan and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Initiated Polymerization II written by Rainer Jordan and published by Springer Science & Business Media. This book was released on 2006-03-02 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions by numerous experts
Download or read book Synthesis and Applications of Copolymers written by Anbanandam Parthiban and published by John Wiley & Sons. This book was released on 2014-06-10 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the reactivity of monomers is crucial in creating copolymers and determining the outcome of copolymerization. Covering the fundamental aspects of polymerization, Synthesis and Applications of Copolymers explores the reactivity of monomers and reaction conditions that ensure that the newly formed polymeric materials exhibit desired properties. Referencing a wide-range of disciplines, the book provides researchers, students, and scientists with the preparation of a diverse variety of copolymers and their recent developments, with a particular focus on copolymerization, crystallization, and techniques like nanoimprinting and micropatterning.
Download or read book Synthesis and Characterization of Various Macromolecular Architectures by Using Combined Controlled and Photoinitiated Polymerization Methods written by Ali Ekrem Müftüoğlu and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced polymeric materials with specialized properties are of great interest. Block and graft copolymers are the most demanded advanced materials since they display combined physical and mechanical properties. Because of their diverse macromolecular structures, they may possess novel characteristics required for many high-tech applications. Therefore, engineering macromolecular architectures is one of the major goals in polymer chemistry. Controlled polymerization methods appear to be the most powerful and versatile tools in achieving this goal. in the present work, macromolecular chains of various chemical compositions were ~ assembled in original topologies by combination of Atom Transfer Radical Polymerization (ATRP) or Ring-opening Polymerization (ROP) with photoinduced radical or radical promoted cationic polymerizations. These macromolecular architectures involve block, graft, block-graft, and brush type copolymers as well as miktoarm star copolymers and hyper-branched polymers... For this purpose, end-chain, mid-chain or side-chain mono- or bi- amino- or N;N- dimethylamino- functional precursor polymers were prepared either by A TRP or ROP. Subsequently, these prepolymers served as macromolecular co-initiators in photoinduced radical or promoted cationic polymerizations. For the preparation of diblock copolymers, N,N-dimethylaniline end-functional polystyrenes (PSt) with well-defined structures and low polydispersities were synthesized by A TRP of styrene in bulk at 11 O0C using 4-( dimethylamino )benzyl 4- (bromomethyl) benzoate as initiator in conjunction with a cuprous complex, Cu(I)Br/bipyridine. These polym'ers were further used in block copolymerization with methyl methacrylate (MMA) and cyclohexene oxide (CHO) via photoinduced radical and radical promoted cationic polymerization routes, respectively, as represented by (1) and (2). in the former case, macroradical generation was achieved with benzophenone sensitizer by photoexcitation followed by hydrogen abstraction from amino end groups. A visible light initiating system has been utilized in the radical promoted cationic polymerization of CHO. The system involves a xanthene dye (Erythrosin B) as the sensitizer, an aromatic N;N-dimethylamino group and diphenyl iodonium hexafluorophosphate as the radical source and radical oxidizer, respectively. While pure block copolymers were obtained in the free radical route, the free radical promoted cationic polymerization yielded both block and homopolymers...
Download or read book Molecularly Imprinted Catalysts written by Songjun Li and published by Elsevier. This book was released on 2015-09-30 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecularly Imprinted Catalysts: Principle, Synthesis, and Applications is the first book of its kind to provide an in-depth overview of molecularly imprinted catalysts and selective catalysis, including technical details, principles of selective catalysis, preparation processes, the catalytically active polymers themselves, and important progress made in this field. It serves as an important reference for scientists, students, and researchers who are working in the areas of molecular imprinting, catalysis, molecular recognition, materials science, biotechnology, and nanotechnology. Comprising a diverse group of experts from prestigious universities and industries across the world, the contributors to this book provide access to the latest knowledge and eye-catching achievements in the field, and an understanding of what progress has been made and to what extent it is being advanced in industry. The first book in the field on molecularly imprinted catalysts (MIPs) Provides a systematic background to selective catalysis, especially the basic concepts and key principles of the different MIP-based catalysts Features state-of-the art presentation of preparation methods and applications of MIPs Written by scientists from prestigious universities and industries across the world, and edited by veteran researchers in molecular imprinting and selective catalysis
Download or read book Synthesis and Characterization of Telechelic Polymers by the Combination of Reserve Atom Transfer Radical Polymerization and Atom Transfer Radical Coupling Processes written by Binnur Aydoğan and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Hyperbranched Polyacrylates Using Self condensing Vinyl Polymerization SCVP Atom Transfer Radical Polymerization ATRP by Diverse Initiation Techniques in Aqueous Dispersed Systems written by Guillermina C. Garcia and published by . This book was released on 2013 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major thrust of polymer research in both industry and academia is being driven by the push for sustainable raw materials, environmentally friendly production processes and products that are biodegradable. Hyperbranched polyacrylates were synthesized by atom transfer radical polymerization by self-condensing vinyl polymerization (ATRP-SCVP) using a new class of inimers based on a naturally occurring amino acid, L-serine. The structure of these hyperbranched polyacrylates (HP) includes an ester group at the branch points and in the polymer backbone of many of the repeat units, which provide sites for biodegradation via hydrolysis. In contrast to previous studies, which were performed in bulk or solution and took long periods of time to reach high molecular weight (Mn), we synthesized our hyperbranched polyacrylate using emulsions and mainly miniemulsions polymerization techniques. This provides an environmentally friendly system, high number average molecular weight in the range of 105 to 106 Da, particle size distribution in the range of 50 to 500 nm, high functionality and high reactivity rate. The emulsion and/or miniemulsion conditions that were performed include normal ATRP, reverse ATRP, simultaneous reverse normal initiation SRNI-ATRP, and activator generated by electron transfer AGET-ATRP. The physical and chemical properties of the hyperbranched polyacrylates were studied in detail by 11H, and 13C 1D nuclear magnetic resonance (NMR) spectroscopies. The molecular weights were determined by gel permeation chromatography using light scattering (GPCLS) and reflactive index (GPCPSt) detectors. Thermal properties, such as glass transitions and melting temperatures were determined by differential scanning calorimetry, and the morphology by scanning electron microscopy (SEM). Emulsions and miniemulsions that were sonicated in OMNOVA were analyzed by traditional test methods, including particle size average distribution (number and volume) by DLS (nanotrac), surface tension energy, pH, thermal transition, number average molecular weight Mn, weight average molecular weight Mw and molecular weight distribution (PDI). The rheological properties of these latexes were evaluated using a Brookfield viscometer. The presence of branching in the hyperbranched polyacrylates was analyzed using 2D NMR spectroscopy based on heterogeneous and homogenous techniques such as 1H-1H COSY, 1H-1H TCOSY, 1H-13C HMBC and 1H-13C HSQC NMR. Finally biodegradation studies from these samples were followed by degradation procedures previously reported in our group. This dissertation's results provided us with a better option to produce hyperbranched polyacrylates with a high degree of functionality, in a single-pot, in aqueous conditions controlling molecular weight, and particle size distribution maintained colloidal stable miniemulsions.
Download or read book Three Dimensional Free Radical Polymerization written by Gennady V. Korolyov and published by Springer Science & Business Media. This book was released on 2008-12-11 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book discusses the latest developments in the entire field of three-dimensional free-radical polymerization. It is the first book on the subject comprising the research results of the last 40 years and will benefit the specialist in new high-tech areas.
