stereospecific polymerization of isoprene

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Stereospecific Polymerization Of Isoprene

Author : Elena Ceausescu
ISBN : 9781483154749
Genre : Science
File Size : 66. 81 MB
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Stereospecific Polymerization of Isoprene, a doctoral dissertation by Dr. Elena Ceausescu, is a study of the synthesis of cis-l, 4-polyisoprene rubber, an elastomer of synthetic rubber whose structure and properties are similar to that of natural rubber. This elastomer is primarily used in the manufacture of tires, belts, hoses, matting, flooring, dampeners, and other synthetic rubber goods. The book is organized into two parts. Part I, the Ph.D. thesis, focuses on the explanation and exposition of the polymerization reaction; properties of the polymer; and certain theoretical aspects related to the polymer’s reaction mechanism and kinetics. Part II presents data derived from an extensive variety of experiments and tests intended to serve as a basis for the industrial production of cis-l, 4-polyisoprene rubber. The text will be an interesting book for materials engineers, industrial engineers, chemists, and science students engaged in the study of polymers.

Stereoselective Polymerization With Single Site Catalysts

Author : Lisa S. Baugh
ISBN : 142001708X
Genre : Technology & Engineering
File Size : 68. 44 MB
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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 polymer chains affects polymer properties and presents the latest strategies for developing tactic polymers using single-site catalysis. This unified volume explains the mechanistic basics of tactic polymerizations, beginning with an extensive survey of the most important classes of metallocene and post-metallocene catalysts used to make polypropylenes. It also focuses on tactic stereoblock and ethylene/propylene copolymers and catalyst active site models, followed by chapters discussing the structure of more stereochemically complex polymers and polymerizations that proceed via non-vinyl-addition mechanisms. Individual chapters thoroughly describe tactic polymerizations of α-olefins, styrene, dienes, acetylenes, lactides, epoxides, acrylates, and cyclic monomers, as well as cyclopolymerizations and ditactic structures, olefin/CO polymers, and metathesis polyalkenamers. An ideal reference and supplementary text, Stereoselective Polymerization with Single-Site Catalysts enables both new and experienced chemists to better understand tactic polymers and select appropriate catalyst systems for their preparation.

Ziegler Natta Catalysts Polymerizations

Author : John Jr. Boor
ISBN : 9780323143417
Genre : Science
File Size : 49. 60 MB
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Ziegler-Natta Catalysts and Polymerizations reviews the general aspects of Ziegler-Natta catalysts and polymerizations of olefins, dienes, and many other types of monomers. Topics covered include the physical state of the polymer during polymerization; modification of Ziegler-Natta catalysts by third components; and termination of polymer chain growth. The oxidation state of catalysts and active centers is also discussed, along with copolymerizations and block polymerizations. This book is comprised of 23 chapters and begins with an overview of Ziegler-Natta catalysts and polymerizations, their historical origins, scientific and commercial importance, and major advances in polymer science. The next chapter focuses on definitions and stereochemistry of Ziegler-Natta catalysts, together with analytical methods used to identify and quantitatively measure their structures. Some of the polymers produced commercially with Ziegler-Natta catalysts are considered. The discussion then turns to mechanisms for initiating and propagating olefins; mechanisms for stereochemical control of conjugated and nonconjugated dienes; and the basic kinetic parameters that characterize Ziegler-Natta polymerizations. This monograph is written especially for chemistry and engineering graduate students and for industrial chemists, engineers, and managers who may become involved in a Ziegler-Natta problem.

Stereoregular Polymers And Stereospecific Polymerizations

Author : Giulio Natta
ISBN : 9781483223865
Genre : Science
File Size : 67. 14 MB
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Stereoregular Polymers and Stereospecific Polymerizations: The Contributions of Guilio Natta and his School to Polymer Chemistry, Volume 1 covers the developments in understanding the reactions, nomenclature, and physico-chemical properties of polymers. This volume is composed of 82 chapters, and starts with surveys of the synthesis and crystal structure of polymers. Significant chapters are devoted to the characterization of crystalline polymers, with emphasis on the determination of their viscosity and molecular weight. Other chapters deal with stereospecific polymers of olefins, mechanism of stereospecific catalysis, reaction kinetics. This volume also considers the polymerization of synthetic elastomers and the copolymerization of olefins, as well as their reaction kinetics. The remaining chapters describe the X-ray characterization of isotactic polymers. This book is directed toward polymer chemists.

Catalysis By Polymer Immobilized Metal Complexes

Author : Anatoly D. Pomogailo
ISBN : 9056991302
Genre : Science
File Size : 49. 46 MB
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Deals with a new and promising field developed during the last two decades on the boundary between homogeneous and heterogeneous catalysis. This book presents general information on catalysis for a wide range of organic reactions, e.g., hydrogenation and oxidation reactions, and polymerization transformations. Special attention is paid to electro- and photochemical stimulation of catalytic processes in the presence of immobilized metal complexes. Other topics covered are the quantitative data on the comparison of catalyses by mobile and immobilized metal complexes; main factors affecting the activity of these catalytic systems and methods of optimizing their control; and specific problems of catalysis by fixed complexes (e.g., ligand exchange and electron transfer in metal polymer systems, macromolecular effects and polyfunctional catalysis).

Caoutchoucs Synth Tiques

Author : Jean-Pierre Arlie
ISBN : 2710806193
Genre : Technology & Engineering
File Size : 70. 62 MB
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Polymer Science Dictionary

Author : M. Alger
ISBN : 0412608707
Genre : Technology & Engineering
File Size : 65. 32 MB
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More than 10,000 entries with expanded encyclopaedic-style definitions make this major reference work invaluable to practitioners, researchers and students working in the area of polymer science and technology. This new edition now includes liquid crystal polymers, new characterisation methods and polymers with special electrical properties

Fast Liquid Phase Processes In Turbulent Flows

Author : Karl Minsker
ISBN : 9789047413219
Genre : Technology & Engineering
File Size : 51. 90 MB
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This book deals with the fundamental laws of passing of fast liquid-phase chemical as well as heat and mass transfer processes in turbulent flows. The fundamental laws of passing of fast liquid-phase chemical and also heat and mass transfer processes in turbulent flows are considered in the book. Development of a macrokinetics approach is generalized to the analysis of fast chemical reactions mainly based on an example of cationic isobutylene polymerization, which falls into to a new class of liquid-phase processes. The ways of decision of the hydrodynamical, thermal and kinetic movement’s equations of reaction mixture in which the fast exothermic chemical reaction runs are described. The principles and laws of formation of the essentially new mode of quasi-plug-flow mode are considered in turbulent flows ensuring quasi-isothermal conditions in zone reaction. The principles of work and area of industrial use of tubular turbulent devices cylindrical reactor, divergent-covergent reactor, shell-and-tube reactor, and reactor with fractional introduction of reactants are considered.

Polymer Synthesis Theory And Practice

Author : Dietrich Braun
ISBN : 3540416978
Genre : Science
File Size : 32. 91 MB
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This Laboratory Manual contains detailed descriptions for the synthesis and characterization of macromolecules. 110 elaborated examples (descriptions of experiments) plus sufficient theoretical explanations enable the reader to learn about the syntheses, modification, characterization and properties of polymers including recent developments. All experiments can be conducted with adequate laboratory equipment. Suitable for students in organic and polymer chemistry as well as for chemists in industry who want to acquaint themselves with the theoretical and practical aspects of macromolecular chemistry.

Active Sites Of Polymerization

Author : Gennady Zaikov
ISBN : 9789047415046
Genre : Technology & Engineering
File Size : 72. 6 MB
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The monograph is intended to systematize data on active sites and their kinetic and stereospecific heterogeneity (polysite phenomenon) in olefin and diene monomer ion, ion-coordination and complex radical polymerization processes. Questions of molecular-mass distribution of polymers obtained by ion and ion-coordination polymerization methods are discussed together with composition and stereo regularity distribution of olefin copolymers. Data on the influence of transition and non-transition metal origin and their ligand ambience, conditions of catalytic system preparation and polymerization are shown. Various assessment methods of polymerization active site distribution by kinetic activity and stereospecific action are considered. In particular, an assessment method for kinetic activity distribution at ion-coordination diene polymerization is described, mathematical simulation parameters for polymerization processes are shown, taking into account the polysite structure of catalytic systems. Of special attention are geometrical and electron structure of active sites in the ion-coordination polymerization by the quantum chemistry method, interrelation between reactivity of some types of active sites and stereospecificity of their action in diene polymerization. The importance of ratio between specific time elementary act duration at the diene injection, coordinated on an active site, and time of propagating macrochain end unit existence in the s-state at polydiene microstructure formation is indicated. Questions of the polysite mechanism occurrence in complex radical polymerization processes are discussed. A possibility for polymerization to proceed in both free-radical and complex related chain propagation sites is shown.

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