✦ LIBER ✦

Porous Semi-Interpenetrating Hydrogel Networks Based on Dextran and Polyacrylamide With Superfast Responsiveness

✍ Scribed by Maria Valentina Dinu; Maria Marinela Perju; Ecaterina Stela Drăgan

Book ID: 102939438
Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 899 KB
Volume: 212
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.201000519

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✦ Synopsis

Abstract

AAm was free‐radical polymerized at various temperatures in the presence of N,N'__‐__methylenebisacrylamide as a cross‐linker and dextran resulting in novel Dx/PAAm semi‐IPNs. The structure and morphology of networks were investigated by means of FTIR, DSC, and ESEM. In comparison to the PAAm network, the interior network structures of the novel semi‐IPNs prepared at −18 °C exhibit a heterogeneous morphology consisting of pores of sizes about 80 µm, while those formed at +5 and +25 °C have pores with sizes about 3 µm. The Dx/PAAm semi‐IPNs exhibited higher swelling ratios, than those without Dx, irrespective of the gel preparation temperature. Moreover, Dx/PAAm semi‐IPN hydrogels formed at −18 °C attain the equilibrium state in water within 15 s. magnified image

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