File Name: polyelectrolytes formation characterization and application .zip
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Chitosan and polyacrylic acid mixtures were prepared in different mole ratios and at different pH values and ionic strengths 0. Complex formation was detected by turbidity measurement and quantified by weighing the freeze dried pellet recovered by centrifugation. In the 3 to 6 pH range, the maximum complex formation occurred at different mole ratios. Quantitative analysis of the supernatant showed that pH affects the complex composition.
Abstract Polyelectrolytes are polymers of oppositely charged ions and their properties differ profoundly than their repeating units. Over recent years, much advancement has been made in the synthesis, characterization and application of polyelectrolytes and polyelectrolyte complexes PECs. There are two kinds of PECs structure: ladder-like structure and scrambled egg model. There are number of elements that influence the synthesis and stability of PEC. Polyelectrolyte complexes are classified based on the type of macromolecules and bonds involved in complexation.
By contrast, relatively less attention has been given to polymer—polymer complex formation with synthetic polyampholytes PA. In this review the complexation of polyampholytes with polyelectrolytes PE is considered from theoretical and application points of view. Formation of intra- and interpolyelectrolyte complexes of random, regular, block, dendritic polyampholytes are outlined. A separate subsection is devoted to amphoteric behavior of interpolyelectrolyte complexes. Formation of polyelectrolyte-polyampholyte complexes PPC is crucial from fundamental and practical points of view [ 1 , 2 , 3 , 4 , 5 ].
Academic and industrial research around polymer-based colloids is huge, driven both by the development of mature technologies, e. Edited by two world-renowned leaders in polymer science and engineering, this is a fundamental text for the field. Based on a specialised course by the editors, this book provides the reader with an invaluable single source of reference. The first section describes formation, explaining basic properties of emulsions and dispersion polymerization, microfluidic approaches to produce polymer-based colloids and formation via directed self-assembly. The next section details characterisation methodologies from microscopy and small angle scattering, to surface science and simulations. The final chapters close with applications, including Pickering emulsions and molecular engineering for materials development. A comprehensive guide to polymer colloids, with contributions by leaders in their respective areas, this book is a must-have for researchers and practitioners working across polymers, soft matter and chemical and molecular engineering.
Over the past several years, great advances have been made towards novel drug delivery systems. The phenomena of interpolymer interactions and formation of polyelectrolyte complexes have been the focus of intensive fundamental and applied research. Interpolyelectrolyte complexes combine unique physicochemical properties with high biocompatibility. Studies have been carried out on many different polymer blends and types. Such combinations may possess unique properties that are different from those of individual component. The present review emphasizes on the applicability of polyelectrolyte complexes in drug delivery technology.
Polyelectrolytes are polymers whose repeating units bear an electrolyte group. Polycations and polyanions are polyelectrolytes. These groups dissociate in aqueous solutions water , making the polymers charged. Polyelectrolyte properties are thus similar to both electrolytes salts and polymers high molecular weight compounds and are sometimes called polysalts. Like salts, their solutions are electrically conductive. Like polymers, their solutions are often viscous.
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