The Concept of Micellar-Sponge Nanophases in Chemical Physics of Polymers

The Concept of Micellar-Sponge Nanophases in Chemical Physics of Polymers
Title The Concept of Micellar-Sponge Nanophases in Chemical Physics of Polymers PDF eBook
Author Yuri Arsenovich Mikheev
Publisher CRC Press
Pages 465
Release 2004-04-01
Genre Technology & Engineering
ISBN 9067644021

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The monograph is intended for elucidation of the novel trend in chemical physics regarding the polymer non-crystalline phase. It stresses the physical phenomena affecting the kinetics and mechanism of chemical reactions proceeding in the non-crystalline polymer matrix (NCPM). NCPM is depicted in terms of a supramolecular (carcass-micellar) model. The model is thought to reflect heterophase packing of polymeric chains, which co-operate as a molecular-chain sponge. The NCPM model presented is proved for adequate description of principal structure-physical phenomena to elaborate the scheme of structural-kinetic modeling of chemical reactions in bulky polymers. Structure-physical phenomena elucidated in the monograph are: - peculiarities of polymer plasticization and polymer blending with liquids; - structural and thermodynamic aspects of sorption of low molecular species; - properties of ESR (spin) probes and optical (molecular) probes; - features of water absorbed by polymers; - mechanical and thermal effects generated by the molecular-chain sponge; - supramolecular aspects of NCPM chemical physics. This monograph includes the structural-kinetic modeling of complex polymer chemical reactions. It deals with the problem of mechanism and kinetics of free radical chain reactions using thermal and photochemical model reactions of dibenzoyl peroxide with glassy-like polymers (cellulose triacetate, polycarbonate, polystyrene, polyamide PA-548), viscoelastic polymers (atactic polypropylene, polyamide PA-548, polyethylene, polyisobutylene, melted poly(ethylene oxide), and isotactic polypropylene. In all cases, the supramolecular heterophase mechanism of the processes, which was unknown for homogeneous systems, was proved. Furthermore, heterophase mechanisms of photochemical reaction between naphthalene and cellulose triacetate and photolysis of poly(methyl methacrylate) proceeding as a photochain reaction are indicated.

Diversity in Chemical Reactions

Diversity in Chemical Reactions
Title Diversity in Chemical Reactions PDF eBook
Author Gennadiĭ Efremovich Zaikov
Publisher Nova Publishers
Pages 340
Release 2006
Genre Science
ISBN 9781600210945

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This book includes reviews on the ozone influence on natural and synthetic rubbers, interactions between micro-organisms and polymers, chitosan (natural polysaccharide) oxidation, nano-phases and kinetic model of chain reactions of polypropylene with peroxides, heat stability of vinylchloride polymers subjected intensive force influences of the pressure with shear type, bio-damages of materials and adhesion of micro-organisms on materials surface, intensification of dust removal process, stationary kinetics of the linear polymerisation till the high conversions, stationary kinetics of 3D polymerisation till the high conversions, and the study of the grossing process in the grosses of fluted type.

Biocide Guanidine Containing Polymers

Biocide Guanidine Containing Polymers
Title Biocide Guanidine Containing Polymers PDF eBook
Author Sivov
Publisher CRC Press
Pages 157
Release 2006-03-01
Genre Science
ISBN 9047418069

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This volume deals with chemistry of polyelectrolytes, namely biocide guanidine containing polymers, discussing both synthesis of new guanidine containing monomers of diallyl and acrylic nature and their structure and investigation of their radical (co)polymerization and properties of new (co)polymers.The first parts of the book describe radical pol

Photodegradation and Light Stabilization of Heterochain Polymers

Photodegradation and Light Stabilization of Heterochain Polymers
Title Photodegradation and Light Stabilization of Heterochain Polymers PDF eBook
Author Niyazi
Publisher CRC Press
Pages 195
Release 2006-11-14
Genre Technology & Engineering
ISBN 9004153624

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Photodegradation and light stabilization are very important aspects of polymer aging. Polymer degradation includes different types of processes: thermodegradation, oxidation, acting of ozone, photodegradation, radiation, hydrolysis, mechanical degradation, and biodegradation. It is very important to know the mechanism of polymer degradation in order to select stabilizers against the degradation. This volume presents the analysis of achievements in the field of photodegradation of polymers. It includes, first of all, data of Russian investigators who have decisively contributed in the development of this field of knowledge (the schools headed by academicians V.V. Korshak, N.M. Emanuel, N.S. Enikolopov, A.A. Berlin, and many others).

Stationary and Non-Stationary Kinetics of the Photoinitiated Polymerization

Stationary and Non-Stationary Kinetics of the Photoinitiated Polymerization
Title Stationary and Non-Stationary Kinetics of the Photoinitiated Polymerization PDF eBook
Author Medvedevskikh
Publisher CRC Press
Pages 333
Release 2004-08-31
Genre Technology & Engineering
ISBN 9067644153

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The main focus in this monograph is on models of the kinetics of photo-initiated polymerization of mono- and bi-functional monomers up to the high conversion stage, their derivation, analysis and comparison with the experimental data. This monograph can be useful for scientists, engineers, post-graduate training students and students who are interested in problems both of the polymerization kinetics and general chemical kinetics.

Thermal Oxidation of Polymer Blends

Thermal Oxidation of Polymer Blends
Title Thermal Oxidation of Polymer Blends PDF eBook
Author Lyudmila Shibryaeva
Publisher CRC Press
Pages 192
Release 2006-06-08
Genre Technology & Engineering
ISBN 906764451X

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To identify the specific features of the kinetics of oxidation of polymer mixtures, determine the key structural elements, and create a model that can describe the mechanism of thermal oxidation of polymer mixtures, it is necessary to determine the relation between the initial structure of a polymer mixture, structural rearrangements associated with oxidation and the kinetics of the process. The aim of this book is to elucidate the complicated problem concerning the connection between the structure and mechanism of oxidation of heterogeneous and heterophase polymer systems. The material presented in this book concerns the specific features of the kinetics of oxidation and those of the structure of polymer systems. The book deals with an analysis of the key factors that can affect principally the mechanism of thermal oxidation of polymer mixtures, determines the role of the phase morphology, structure of components, and the interface layer (or boundary) in the kinetics of oxidation of heterophase system by an example of mixtures of polyolefines. Along with the kinetics of oxidation of heterophase systems, problems of investigation of their structural parameters in the oxidized state are considered. With this aim, the material presented in the book concerns not only the mechanism of oxidation of polymer mixtures but also homopolymers of diverse morphology and model systems.

Thermal Stability of Engineering Heterochain Thermoresistant Polymers

Thermal Stability of Engineering Heterochain Thermoresistant Polymers
Title Thermal Stability of Engineering Heterochain Thermoresistant Polymers PDF eBook
Author Kalugina
Publisher CRC Press
Pages 289
Release 2004-08-31
Genre Technology & Engineering
ISBN 906764417X

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This book presents investigation results of thermal transformations in thermoresistant polymers: polysulfones, polyester-imides, aliphatic-aromatic polyimides and polyamides, liquid-crystal aromatic co-polyesters, polyphenylquinoxalines at temperatures of materials and articles processing and operation. An important result of investigations is the determination of thermooxidative degradation regularities for aliphatic-aromatic heterochain polymers and description of the degradation mechanism. The applied aspect of this work is the approach to stabilization of thermoresistant polymers and composite materials derived from them using additives and analysis of the mechanism of high-temperature inhibited oxidation. The book presents results which have been obtained through many years of research until recently, mostly obtained by scientists of G.S. Petrov Research Institute of Polymeric Materials (Moscow, Russia) – one of the leading Institutes in this branch - which have not been available in international scientific publications before.