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Porous Semi‐Interpenetrating Hydrogel Networks Based on Dextran and Polyacrylamide With Superfast Responsiveness
Author(s) -
Dinu Maria Valentina,
Perju Maria Marinela,
Drăgan Ecaterina Stela
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000519
Subject(s) - self healing hydrogels , polyacrylamide , polymer chemistry , swelling , morphology (biology) , radical polymerization , dextran , environmental scanning electron microscope , interpenetrating polymer network , chemical engineering , materials science , fourier transform infrared spectroscopy , polymerization , porosity , network structure , polymer , chemistry , composite material , scanning electron microscope , organic chemistry , genetics , machine learning , computer science , engineering , biology
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.