Absorbent Polymer Technology - download pdf or read online

By Lisa Brannon-Peppas

ISBN-10: 0444886540

ISBN-13: 9780444886545

In recent times, there was a veritable explosion of analysis and improvement in consumer-oriented fields that make the most of polymeric fabrics which take up quite a lot of water. those fields surround the education, characterization and commercialization of separation structures, pharmaceutical and private care items reminiscent of baby diapers, female items, incontinence items and lots of different comparable parts. The polymeric fabrics used in those purposes are referred to as absorbent or superabsorbent fabrics due to their skill to swell quickly and to preserve huge volumes of water, urine and different organic fluids. the purpose of this ebook is to introduce the basics of polymer constitution and swelling as concerning polymers used for those superabsorbent fabrics. within the box of absorbence, specific cognizance is given to crosslinked constructions which swell to greater than fifty instances their preliminary weight in water or electrolytic options. The publication additionally presents descriptions of novel purposes of superabsorbent fabrics in addition to an in depth research of water shipping in crosslinked polymers

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SWELLING BEHAVIOR An integral part of the physical behavior of hydrogels is their swelling behavior in water, since upon preparation, they must be brought in contact with water to yield the final, solvated, network structure. Figure 3 indicates two of the possible processes of swelling. place in solvent t>2= 1, dry state i) 2 s< 1, swollen state place in solvent ^2=\r<1 as prepared, with solvent present v2 s < i) < 1, swollen state Figure 3. Swelling procedures from dry and partially swollen states.

For example, depending on their charges [8], they may be classified as: • • • • neutral hydrogels; anionic hydrogels; cationic hydrogels; and ampholytic hydrogels. According to their mechanical and structural characteristics [9], they may be classified as: • affine networks; and • phantom networks. Depending upon the method of preparation, they may be classified as: • homopolymer networks; • copolymer networks; • multipolymer networks; and • interpenetrating polymeric networks [10]. The fourth classification is based on physical structural features of the system [11].

Equations 1 to 5 provide the fundamental relationships between swelling capacity, modulus and the crosslink density. For superabsorbent polymers a plot of modulus versus swelling capacity demonstrates this relationship, Figure 1. O Figure 1. Swelling modulus versus swelling capacity (Brandt, et al. [21]). 959) Swelling Capacity From the equations given above from the Flory-Erman theory, and assuming a randomly crosslinked, four-functional network typical of the commercial superabsorbent polymers, an equation can be derived for the swelling capacity in terms of the key polymerization parameters.

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Absorbent Polymer Technology by Lisa Brannon-Peppas

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