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Author: Sean Gitter Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Modern synthetic polymer chemistry is defined by control over macromolecular architecture. Among controlled polymerization schemes, ring-opening metathesis polymerization (ROMP) represents one of the most widely adopted strategies for precision polymer synthesis. Advances in metal-alkylidene initiator technologies have enabled access to polymers with unrivalled degrees of microstructural control via ROMP. Unfortunately, relying on stoichiometric amounts of organometallic initiators can be cost prohibitive and limit the utility of ROMP materials in metal-sensitive applications like biomedicine or electronics. Therefore, recent effort has been devoted to developing metal-free approaches to ROMP (MF-ROMP). The Boydston group has developed a strategy which relies on organic initiators and photoredox catalysts to achieve MF-ROMP. Despite precluding the deleterious metallic byproducts inherent to metal-mediated ROMP, MF-ROMP remains limited in comparison to metal-mediated approaches to ROMP. Outstanding challenges in MF-ROMP include achieving a high degree of control over polymer microstructure, the incorporation of functional (co)monomers in MF-ROMP materials, and conducting polymerizations in nonpolar media. My doctoral research has begun to address these challenges. First, I was part of a collaborative team that discovered an ion-pairing approach to stereoselectivity during MF-ROMP that affords materials with tunable alkene stereochemistry using simple to change reaction parameters. During a further investigation we discovered that ion-pairing can also be used to improve the molecular weight control of MF-ROMP. These findings directly led to the discovery that active esters are readily polymerizable under MF-ROMP conditions. Post-polymerization modification of these materials provided access to a diverse array of functionalized MF-ROMP polymers for the first time. Separately, I was also on a team that developed a method for the C-H functionalization and allylic amination of ROMP polynorbornenes (poly(NBEs)). Notably, our approach to C-H functionalization yielded materials with high and tunable degrees of amination without consuming or transposing the alkenes in the polymers' backbones. In combination these discoveries highlight the utility of catalysis to access polymeric architectures that are otherwise inaccessible.
Author: Sean Gitter Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Modern synthetic polymer chemistry is defined by control over macromolecular architecture. Among controlled polymerization schemes, ring-opening metathesis polymerization (ROMP) represents one of the most widely adopted strategies for precision polymer synthesis. Advances in metal-alkylidene initiator technologies have enabled access to polymers with unrivalled degrees of microstructural control via ROMP. Unfortunately, relying on stoichiometric amounts of organometallic initiators can be cost prohibitive and limit the utility of ROMP materials in metal-sensitive applications like biomedicine or electronics. Therefore, recent effort has been devoted to developing metal-free approaches to ROMP (MF-ROMP). The Boydston group has developed a strategy which relies on organic initiators and photoredox catalysts to achieve MF-ROMP. Despite precluding the deleterious metallic byproducts inherent to metal-mediated ROMP, MF-ROMP remains limited in comparison to metal-mediated approaches to ROMP. Outstanding challenges in MF-ROMP include achieving a high degree of control over polymer microstructure, the incorporation of functional (co)monomers in MF-ROMP materials, and conducting polymerizations in nonpolar media. My doctoral research has begun to address these challenges. First, I was part of a collaborative team that discovered an ion-pairing approach to stereoselectivity during MF-ROMP that affords materials with tunable alkene stereochemistry using simple to change reaction parameters. During a further investigation we discovered that ion-pairing can also be used to improve the molecular weight control of MF-ROMP. These findings directly led to the discovery that active esters are readily polymerizable under MF-ROMP conditions. Post-polymerization modification of these materials provided access to a diverse array of functionalized MF-ROMP polymers for the first time. Separately, I was also on a team that developed a method for the C-H functionalization and allylic amination of ROMP polynorbornenes (poly(NBEs)). Notably, our approach to C-H functionalization yielded materials with high and tunable degrees of amination without consuming or transposing the alkenes in the polymers' backbones. In combination these discoveries highlight the utility of catalysis to access polymeric architectures that are otherwise inaccessible.
Author: Alexandra Romina Albunia Publisher: Springer ISBN: 3030034763 Category : Technology & Engineering Languages : en Pages : 276
Book Description
This book provides an overview of polyolefine production, including several recent breakthrough innovations in the fields of catalysis, process technology, and materials design. The industrial development of polymers is an extraordinary example of multidisciplinary cooperation, involving experts from different fields. An understanding of structure-property and processing relationships leads to the design of materials with innovative performance profiles. A comprehensive description of the connection between innovative material performance and multimodal polymer design, which incorporates both flexibility and constraints of multimodal processes and catalyst needs, is provided. This book provides a summary of the polymerization process, from the atomistic level to the macroscale, process components, including catalysts, and their influence on final polymer performance. This reference merges academic research and industrial knowledge to fill the gaps between academic research and industrial processes. · Connects innovative material performance to the flexibility of multimodal polymer design processes; · Provides a comprehensive description of the polymerization process from the atomic level to the macroscale; · Presents a polyhedric view of multimodal polymer production, including structure, property, and processing relationships, and the development of new materials.
Author: Shinichi Itsuno Publisher: John Wiley & Sons ISBN: 1118063953 Category : Technology & Engineering Languages : en Pages : 674
Book Description
This book reviews chiral polymer synthesis and its application to asymmetric catalysis. It features the design and use of polymer-immobilized catalysts and methods for their design and synthesis. Chapters cover peptide-catalyzed and enantioselective synthesis, optically-active polymers, and continuous flow processes. It collects recent advances in an important field of polymer and organic chemistry, with leading researchers explaining applications in academic and industry R & D.
Author: V. Dragutan Publisher: Elsevier ISBN: 0080528627 Category : Technology & Engineering Languages : en Pages : 1293
Book Description
This book covers the most important topics concerning cationic Ziegler-Natta and ring-opening metathesis polymerization of cycloolefins. The work describes the major pathways that cycloolefins can follow under the action of specific catalytic systems, essentially vinyl and ring-opening polymerization, both reaction types allowing the manufacture of distinct products with wide applicability in modern technologies. The comprehensive data available on this subject are logically and systematically selected and reviewed throughout 18 chapters, according to the basic catalytic processes involved, types of monomers and catalysts employed, reaction conditions and application fields. The modern trends in design of chiral metallocene catalysts, well-defined living metathesis catalysts, catalysts tolerant toward functionalities and water systems are highlighted. The book discusses in detail the relevant aspects of these processes including reaction thermodynamics, kinetics, mechanisms and stereochemistry and correlates the structure of produced polymers with their chemical and physical-mechanical properties. Related important topics include Ziegler-Natta polymerization of olefins and dienes, atom transfer radical polymerization of vinyl compounds, metathesis of olefins and acetylenes, acyclic diene metathesis reaction, carbonyl olefination reaction, metathesis polymerization of acetylenes, metathesis degradation of polymers and ring-opening polymerization of heterocycles. Special emphasis is laid upon the manufacture of commerical products, new polymers and copolymers of potential interest for industry and design and synthesis of speciality polymers with particular structures and architectures and desired properties. The book critically evaluates the most recent achievements reported in this field and outlines the modern trends on the research and application of the catalytic processes for cycloolefin polymerization. For the first time, comprehensive information about the published data on the subject up to now is provided for both academic and industrial researchers working in the areas of polymer chemistry, organic and organometallic chemistry, surface science and catalysis, petrochemistry and chemical engineering. This stimulating book offers an enlightening introduction and a quick documentation on the subject as well as a solid background in this field. Moreover, the work offers a wealth of useful information for specialists applying polymers in various scientific and industrial areas.
Author: Lisa S. Baugh Publisher: CRC Press ISBN: 142001708X Category : Science Languages : en Pages : 698
Book Description
New synthetic techniques allow chemists to modify polymer microstructures more precisely than ever, making it possible to design materials that meet increasingly demanding performance requirements. Written and edited by experts in the field, Stereoselective Polymerization with Single-Site Catalysts reviews how the relative stereochemistry of
Author: Songjun Li Publisher: Elsevier ISBN: 012801444X Category : Technology & Engineering Languages : en Pages : 312
Book Description
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
Author: Kazuo Soga Publisher: Elsevier Science & Technology ISBN: Category : Alkenes Languages : en Pages : 448
Book Description
Recent development of olefin polymerization catalysts has caused marked changes in both industrial and academic research. Industrial use of homogeneous metallocene catalysts has already begun in the fields of high density polyethylene and syndiotactic polypropylene. Moreover, important data have been obtained from academic investigations which have proved useful for understanding conventional heterogeneous Ziegler-Natta catalysts. From the industrial viewpoint, however, heterogeneous high-yield catalysts seem to be more important. The present volume contains invited lectures and contributed papers. The following topics are covered: (1) Heterogeneous Catalysts, (2) Metallocene Catalysts and (3) New Trends in the Polyolefin Industry.
Author: Shiro Kobayashi Publisher: John Wiley & Sons ISBN: Category : Science Languages : en Pages : 606
Book Description
This book provides a comprehensive survey of the entire field of catalysis in polymer synthesis covering the majority of essential aspects from basic organic, organometallic and bio-chemistry to industrial production. Particular emphasis is placed on "precision polymerization," where the catalyst plays a key role in the fabrication of innovative polymers. Precision polymerization enables the production of polymers with precisely controlled structures, molecular weight, distribution and stereochemistry, free from defects.
Author: Songjun Li Publisher: Elsevier ISBN: 0128118725 Category : Technology & Engineering Languages : en Pages : 300
Book Description
Smart Polymer Catalysts and Tunable Catalysis describes the latest advances in smart polymer catalysts and tunable catalysis. This book will serve as an ideal reference for scientists, students and researchers working in the fields of catalysis, chemical engineering, chemistry, materials science, biotechnology and nanotechnology. Users will find this to be a distinct, systematic and comprehensive body of knowledge on the field with its compilation of essential knowledge and discussions of extensive potential in both social and commercial impacts. Provides a single-source summary of the emerging frontiers in scientific research in smart polymer catalysts and tunable catalysis Includes very well-organized chapters that are illustrated with over 130 illustrations and figures Written by scientists from prestigious universities and industries across the world Edited by veteran researchers in the field of smart polymers and catalysis
Author: Sean Gitter
Author: Sean Gitter
Author: Alexandra Romina Albunia
Author: Shinichi Itsuno
Author: V. Dragutan
Author: Lisa S. Baugh
Author: Songjun Li
Author: Kazuo Soga
Author: Shiro Kobayashi
Author: H. N. Cheng
Author: Songjun Li