By Lisa Brannon-Peppas
Lately, there was a veritable explosion of study 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 coaching, characterization and commercialization of separation structures, pharmaceutical and private care items reminiscent of baby diapers, female items, incontinence items and lots of different similar components. The polymeric fabrics used in those functions are referred to as absorbent or superabsorbent fabrics due to their skill to swell swiftly and to keep 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 recognition is given to crosslinked constructions which swell to greater than fifty instances their preliminary weight in water or electrolytic strategies. The booklet additionally presents descriptions of novel purposes of superabsorbent fabrics in addition to a close research of water shipping in crosslinked polymers
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Additional resources for Absorbent Polymer Technology
In this method, starch was pre-reacted with the eerie ion. Then uncomplexed metal ion was removed from the starch by filtration of the aqueous phase. The complexed starch-Ce4* was then reacted with monomer. Higher efficiencies of grafting were observed using this technique. However, the results also showed that only a small part of the starch was involved in the graft polymer formation. This lead to the hypothesis that the graft polymer is formed by termination of growing homopolymer chains at activated starch sites.
Tsubakimoto, T. Shimomura and Y Irie, U. K. patent GB 2,119,384 A, 1983. H. Yamasaki, T. Kobayashi and Y Sumida, U. S. patent 4,497,930, 1985. A. G. Mikos, C. G. Takoudis and N. A. Peppas, Polymer, 28 (1987) 998. H. Yamasaki, Y Sumida and S. Harada, U. S. patent 4,459,396, 1984. J. FloryandJ. , Chem. , 11 (1943)521. A. A. M. A. Mktchian, Eur. Polym. , 11 (1975) 153. 45 PREPARATION AND CHARACTERIZATION OF CROSSLINKED NETWORKS HYDROPHILIC L. O. Box 708, Greenfield, IN 46140, USA SUMMARY In preparing and evaluating polymers for use as absorbent materials, it is critical to know those parameters which will govern the nature of the final polymer.
Practical graft polymerizations attempt to initiate the polymerization using a redox reaction of an oxidant with oxidizable groups of the polysaccharide. The oxidant is usually the oxidized form of a metal ion, of which several are discussed in the next section. Many of the metal ion systems investigated also initiate polymerization in the absence of the polysaccharide and so contribute to homopolymerization of the monomer with reduction in the amount of graft copolymer. Another complication is the generally observed termination of propagating chains with metal ion.
Absorbent Polymer Technology by Lisa Brannon-Peppas