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portada structure formation in solution: ionic polymers and colloidal particles
Type
Physical Book
Author
Publisher
Year
2005
Language
English
Pages
350
Format
Hardcover
Dimensions
23.4x15.6x2.1 cm
Weight
0.68 kg.
ISBN
3540252711
ISBN13
9783540252719
Categories

structure formation in solution: ionic polymers and colloidal particles

Norio Ise (Author) · Ikuo Sogami (Author) · Springer · Hardcover

structure formation in solution: ionic polymers and colloidal particles - Ise, Norio ; Sogami, Ikuo

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Synopsis "structure formation in solution: ionic polymers and colloidal particles"

1. 1 Macroionic Systems and the Scope of the Book Inthepresentmonograph, wewilldiscussionicpolymersolutionsandcolloidal dispersions. When these substances are dissolved into a solvent, they produce ionicspecies havinglargemolecularweightsandtheir counterions. We knowa variety of naturally occurring ionic polymers and chemically synthesizedc- pounds. Examples of the former are nucleic acids and some proteins, which playanimportantroleinbiologicalsystems. Examplesofsyntheticionicpo- mers are polyacrylic acid (PAA), polystyrenesulfonic acid (PSS) and poly- lylamine (PAAm). PAAisahighpolymer, inwhichmacrylicacidmoleculesCH =CH(COOH) 2 arelinearlypolymerizedby covalent bonds. Thenumber mis calledthe degree 3 of polymerization and is usually of the order of 10 . When PAA is dissolved in a dissociating solvent like water, anionic macroions and counterions are produced. In the following scheme, the counterions are protons but they may + be metal cations such as Na: ? ? ? ? ?CH ? CH? ?CH ? CH? 2 2 + ? ? ? ? + mH ? COOH COO m m PAA PAA anion Counterions. PAAm is a cationic polymer and dissociates into PAAm cations and anionic counterions as shown below: ? ? ? ? ?CH ? CH? ?CH ? CH? 2 2 ? ? ? ? ? +mHCl ? +mCl + CH ?NH CH ?NH 2 2 2 3 m m PAAm PAAm cation Counterions. 2 1 Introduction + ? In the case of NaCl, it dissociates into Na and Cl, which both have low molecular weights. On the other hand, PAA anions and PAAm cations have 3 highmolecularweights. Ifmis10, onepolymerion(macroion)hasananalyt- 3 + icalchargenumberZ of10, whichisexceedinglylargerthan1forNa .

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