Structure and Properties of Ionomers
Structure and Properties of Ionomers

Author: Michel Pineri

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 579

ISBN-13: 9400938292

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Ionomers, that is polymers containing a low concentration of charged units along the chain, have been the subject of increasing interest during the past twenty years. The presence of ionic groups in the poly mer changes some of its properties dramatically. Increases in the modu lus and the viscosity of several orders of magnitude have been observed, and changes in the glass transition of hundreds of degrees are possible. In addition, diffusion coefficients can be modified drastically. These changes are due primarily to the presence of reversible ionic cross links in these materials. Because of the low dielectric constant of most organic polymers, the ions or ionic dipoles tend to aggregate ; this aggregation process, however, is limited, because the ionic groups are covalently bonded to the organic chain. Host of the fundamental research done on these materials has been devoted to a determination of the extent of association, the structure of the aggregates, the limi ting factors, and the correlations between molecular and supermolecular structure and the resul ting properties.

Ion-Containing Polymers
Ion-Containing Polymers

Author: A. Eisenberg

Publisher: Elsevier

Published: 2012-12-02

Total Pages: 304

ISBN-13: 0323156754

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Ion-Containing Polymers: Physical Properties and Structure is Volume 2 of the series Polymer Physics. This book aims to fill in the gap in literature regarding the physical aspects of ion-containing polymers. A total of five chapters comprise this book. The Introduction (Chapter 1) generally deals with the application of ion-containing polymers, general classification, and the available works regarding the subject. Chapter 2 establishes the concepts of supermolecular structure and glass transitions in terms of the effects of ionic forces in polymers. These chapters provide the context in the discussion of viscoelastic properties of homopolymers and copolymers in Chapters 3 and 4. Finally, Chapter 5 tackles the configuration-dependent properties of ion-containing polymers. This volume will be of particular help to students in the field of physics and chemistry.

Macromolecular Chemistry-11
Macromolecular Chemistry-11

Author: H. Eisenberg

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 170

ISBN-13: 1483152146

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Macromolecular Chemistry — 11 is a collection of lectures presented at the International Symposium on Macromolecules (The Third Aharon Katzir-Katchalsky Conference) held in Jerusalem, Israel, on July 13-18, 1975. The papers explore a wide range of topics related to macromolecular chemistry, including polyelectrolytes, biologically active synthetic polymers, and spans of polymer chains. The use of polymers as chemical reagents is also considered. This book is comprised of 19 chapters and begins with an introduction to the close relation between polyelectrolytes and hydrophilic colloids. A survey of polyelectrolyte knowledge that has accumulated since about 1940 is also presented. The discussion then turns to biologically active synthetic polymers; polymers and other composites; theories of the condensed polymer state; polymer adsorption inferred from electrical double layer measurements; and mobility and conductivity of ions in and into polymeric solids. The structure and viscoelastic properties of ion-containing polymers in the solid state are also examined, along with the use of graphite insertion compounds as chemical reagents in organic chemistry. The results of research on chemical modification of cellulose are also presented. This monograph will be of interest to chemists.

Concise Polymeric Materials Encyclopedia
Concise Polymeric Materials Encyclopedia

Author: Joseph C. Salamone

Publisher: CRC Press

Published: 1998-08-28

Total Pages: 1778

ISBN-13: 9780849322266

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Concise Polymeric Materials Encyclopedia culls the most used, widely applicable articles from the Polymeric Materials Encyclopedia - more than 1,100 - and presents them to you in a condensed, well-ordered format. Featuring contributions from more than 1,800 scientists from all over the world, the book discusses a vast array of subjects related to the: synthesis, properties, and applications of polymeric materials development of modern catalysts in preparing new or modified polymers modification of existing polymers by chemical and physical processes biologically oriented polymers This comprehensive, easy-to-use resource on modern polymeric materials serves as an invaluable addition to reference collections in the polymer field.

Developments in Ionic Polymers—2
Developments in Ionic Polymers—2

Author: A.D. Wilson

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 364

ISBN-13: 9400941870

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Ionic polymers, like elephants, are easier to recognise than to define. Several methods of classification have been attempted but none is wholly satisfactory because of the extreme diversity of ionic polymers, which range from the organic, water-soluble polyelectrolytes, through hydrogels and ionomer carboxylate rubbers, to the almost infusible inorganic silicate minerals. For this reason, a general classification is not only difficult, but has minimal utility. However, there are some characteristics of these materials that should be highlighted. The role of counterions is the significant one. These ions, either singly or as clusters, take part in the formation of ionic bonds which have a varying structural role. Often they act as crosslinks, but in the halato-polymers the ionic bonds form an integral part of the polymer backbone itself. Conversely, in polymers contain ing covalent crosslinks, such as the ion-exchange resins, the coun terions have virtually no structural role to play, since they dwell in cage-like structures without affecting the crosslinking, and are readily exchanged. They are, perhaps, best described as ion-containing polymers rather than structural ionic polymers. Another crucial factor is the role of water in ionic polymers. The presence of ionic bonds means that there is a tendency for these materials to interact with water. Where the ionic polymer contains a high proportion of ionic units, it acts as a hydrogel and may be highly soluble. Such interactions with water decrease sharply as the ionic content is reduced, though even then water can act as a plasticiser.

Frontiers in Chemistry: Rising Stars
Frontiers in Chemistry: Rising Stars

Author: Steve Suib

Publisher: Frontiers Media SA

Published: 2020-04-17

Total Pages: 910

ISBN-13: 2889635805

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The Frontiers in Chemistry Editorial Office team are delighted to present the inaugural “Frontiers in Chemistry: Rising Stars” article collection, showcasing the high-quality work of internationally recognized researchers in the early stages of their independent careers. All Rising Star researchers featured within this collection were individually nominated by the Journal’s Chief Editors in recognition of their potential to influence the future directions in their respective fields. The work presented here highlights the diversity of research performed across the entire breadth of the chemical sciences, and presents advances in theory, experiment and methodology with applications to compelling problems. This Editorial features the corresponding author(s) of each paper published within this important collection, ordered by section alphabetically, highlighting them as the great researchers of the future. The Frontiers in Chemistry Editorial Office team would like to thank each researcher who contributed their work to this collection. We would also like to personally thank our Chief Editors for their exemplary leadership of this article collection; their strong support and passion for this important, community-driven collection has ensured its success and global impact. Laurent Mathey, PhD Journal Development Manager