Developments in Ionic Polymers-2

Name: Developments in Ionic Polymers-2
Brand: Springer
SKU: 9789401083607
Price: 52.84 EUR
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Автор: A.D. Wilson, rosser

Език:

Корици: С меки корици

Издател: Springer

Наличност: Външен склад

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Ionic polymers, like elephants, are easier to recognise than to define. Several methods of classific...

Информация за книгата

Автор

A.D. Wilson, rosser

Език

Английски език

Корици

Книга - С меки корици

Издадена

2011

страници

356

EAN

9789401083607

ISBN

9401083606

Enbook ID

02185463

Издател

Springer

Теглоt

544

Размери

152 x 229 x 21

Пълно описание

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.

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Developments in Ionic Polymers-2

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