By Lisa Brannon-Peppas
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 practise, characterization and commercialization of separation platforms, pharmaceutical and private care items corresponding to child diapers, female items, incontinence items and plenty of different comparable components. The polymeric fabrics used in those purposes are referred to as absorbent or superabsorbent fabrics as a result of their skill to swell quickly and to hold huge volumes of water, urine and different organic fluids. the purpose of this publication is to introduce the basics of polymer constitution and swelling as concerning polymers used for those superabsorbent fabrics. within the box of absorbence, specific consciousness is given to crosslinked buildings which swell to greater than fifty instances their preliminary weight in water or electrolytic recommendations. The ebook additionally offers descriptions of novel purposes of superabsorbent fabrics in addition to an in depth research of water delivery in crosslinked polymers
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Content material: entrance topic, web page iiiCopyright, web page ivPreface, Pages vii-xChapter 1 - Heterogeneous Catalysis – Chemistry in Two Dimensions, Pages 1-15Chapter 2 - Surfaces and Adsorption, Pages 17-45Chapter three - How Does a Catalyst paintings? , Pages 47-64Chapter four - Catalyst coaching, Pages 65-96Chapter five - Catalytic Reactors and the size of Catalytic Kinetics, Pages 97-121Chapter 6 - The Kinetics and Mechanisms of Catalytic Reactions, Pages 123-142Chapter 7 - Large-Scale Catalytic Reactors, Pages 143-169Chapter eight - a few Catalytic Reactions, Pages 171-217Index, Pages 219-222
Additional resources for Absorbent Polymer Technology
Polymerization was initiated by conventional free radical initiators, of the thermal dissociation or redox types, in a temperature range of 40 - 80°C. 5 mm diameter die to give 2 mm pieces which were air-dried at 180°C. Parks  described an absorbent polymer prepared by copolymerizing acrylic acid with a divinyl crosslinker such as tetraethyleneglycol diacrylate, at a concentration of about 10% in aqueous solution, with sodium persulfate as initiator at 60°C. The polymer was neutralized with sodium hydroxide and then mixed with a solution of divalent ion salt, such as zinc acetate dihydrate.
The polymerization was conducted as a suspension polymerization in an aromatic hydrocarbon with a minor amount of methanol. Initiation was by conventional redox systems such as persulfate/bisulfite. Patentable features were the use of the suspension type process and the use of a crosslinker. Masuda et al.  prepared absorbent resins by reacting starch with partially neutralized acrylic acid and a diacrylate ester crosslinking agent, using Ce4 * as a free radical initiator but without pre-complexation of the polysaccharide.
The absorption rate was also increased in this process. Polymers made from a variety of 42 processes including solution or suspension polymerization could be so treated to give the enhanced properties. CONCLUSION The important physical properties of absorbent polymers are dependent on the precise structure of the polymer network. Of key importance for use in personal care applications are the equilibrium swelling capacity, the rate of swelling and the modulus of the swollen gel. Molecular theories of rubber elasticity describe the relationship between the molecular structure of a crosslinked polymer and the amount of swelling and elastic modulus which result.
Absorbent Polymer Technology by Lisa Brannon-Peppas