Gels - By April Williams and Grant Serbousek Swelling of a...

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By: April Williams and Grant Serbousek
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Swelling of a Cross Swelling of a Cross - - linked linked Polymer Gel Polymer Gel
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G = H - T S Explanation of Gel Swelling Explanation of Gel Swelling Based on Thermodynamics and Based on Thermodynamics and Elastic Forces Elastic Forces z z z ξ parameter: µ : chemical potential ξ = (V m solvent /RT) * ( δ 1 δ 2 ) + β .
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Chemical Nature of Chemical Nature of Hydrophilic Polymers Hydrophilic Polymers Backbone Branches -O- -NH- -N= -OH -COONa NH 2 -- S O 3 Ex: PVA -(CH 2 -C)- H OH Ex: Poly[bis(methylamino)phosphazene] -(N=P(NHCH 3 ) 2 )-
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Hydrosorb: Hydrogel Product Hydrosorb: Hydrogel Product A reusable gel that stores water and slowly releases it back into the soil as the soil begins to dry HYDROSORB™ crystals can cut your watering frequency by up to 50% !
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Hydrosorb Product Hydrosorb Product Polyacrylamide: -(CH 2 -CH)- O-C-O-NH 2 Look at that volume expansion !!!
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Diapers: What makes them so Diapers: What makes them so absorbent?
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This note was uploaded on 12/24/2011 for the course MSE 4554 taught by Professor Staff during the Fall '08 term at Virginia Tech.

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Gels - By April Williams and Grant Serbousek Swelling of a...

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