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Microporous, Thermosensitive Organic‐Inorganic Hybrid Hydrogel Prepared by Freezing
Author(s) -
Kato Norihiro
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200850705
Subject(s) - microporous material , chemical engineering , polymer , materials science , acrylamide , porosity , self healing hydrogels , microstructure , polymer chemistry , diffusion , composite material , copolymer , thermodynamics , physics , engineering
Thermally triggered shrinking rates of poly( N ‐isopropyl‐acrylamide) (PNIPA) ‐based organic‐inorganic hydrogel could be accelerated by applying the ice templating method. Freezing and subsequent rehydration of gels is an effective way to prepare the porous polymer network that leads to rapid expelling of pore water. The shrinking coefficients obtained by fitting Fick's law to the data increased two orders of magnitude as compared with the conventional gel before freezing. The microstructure of gels generated during freezing gels had advantage to expel the pore water rapidly probably due to the PNIPA aggregation through the hydrophobic interaction.