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Novel synthesis of thermosensitive porous hydrogels
Author(s) -
Gotoh Takehiko,
Nakatani Yuko,
Sakohara Shuji
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980801)69:5<895::aid-app8>3.0.co;2-h
Subject(s) - swelling , self healing hydrogels , lower critical solution temperature , monomer , polymerization , polymer chemistry , materials science , chemical engineering , copolymer , scanning electron microscope , radical polymerization , porosity , composite material , polymer , engineering
The simplified method for the synthesis of thermosensitive porous hydrogels by a radical polymerization was presented and their swelling properties were examined experimentally. N,N ‐Diethylacrylamide (DEAAm) or N ‐isopropylacrylamide (NIPAm) as primary monomers and N,N ′‐methylenebisacrylamide (BIS) as a crosslinker were used. They were polymerized in water at various temperatures above the lower critical solution temperature (LCST) of poly‐DEAAm (ca. 32°C) or poly‐NIPAm (ca. 31°C) by using N,N,N′,N ′‐,tetramethylethylenediamine (TEMED) and ammonium peroxsodisulfate (APS) as the polymerization accelerator and initiator, respectively. From the observation by a scanning electron microscope, it was found that these gels consisted of aggregated microgel particles, namely, a porous structure. The gels swelled below their LCSTs, and the swelling degree increased with lowering temperature. Furthermore, the gels swelled or shrank very fast in response to the change in temperature, and the shrinking rate was larger than the swelling rate. Such swelling properties and mechanical properties depended on the porous structure of the gels such as the size of the microgels and the pore volume, which largely changed with the synthesis temperature and the component of the primary monomer. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 895–906, 1998