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Tailoring the mechanical properties of polyacrylamide-based hydrogels

✍ Scribed by Bryan A. Baker; Rebecca L. Murff; Valeria T. Milam

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
431 KB
Volume
51
Category
Article
ISSN
0032-3861

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✦ Synopsis

Here, we studied the mechanical properties of polyacrylic acid-co-polyacrylamide (pAAc/pAAm) and polyacrylate-co-polyacrylamide (pNaAc/pAAm)-based hydrogels as a function of composition and total polymer content. While both polyacrylate and polyacrylic acid are weakly-charged polyelectrolytes with carboxylate side groups, they exhibit different behavior as copolymers with polyacrylamide. In swelling studies the highest degree of volumetric expansion occurs in the polyacrylate-rich hydrogels. Rheological measurements indicate that the shear storage modulus of the hydrogels typically increases with the percentage of polyacrylamide for a given polymer volume fraction; however, the simultaneous strengthening and embrittling effects of polyacrylamide as a copolymer are more dramatic for the pNaAc/pAAm hydrogels.

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