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http://dx.doi.org/10.5012/jkcs.2003.47.1.059

Synthesis and Characterization of Comb-Type Grafted Polymer Hydrogels with Low Temperature Sensitivity  

Taek Kyu Jung (Advanced Materials Division, KRICT)
Sung Soo Kim (Advanced Materials Division, KRICT)
Byung Cheol Shin (Advanced Materials Division, KRICT)
Publication Information
Journal of the Korean Chemical Society / v.47, no.1, 2003 , pp. 59-66 More about this Journal
Abstract
The comb-type grafted polymer hydrogels, which composed of N-isopropylacrylamide monomer and oligo(N-isopropylacrylamide-co-tert-butylacrylamide) [oligo(NIPAAm-co-t-BAM)], were synthesized by redox polymerization in 5~10% methanol aqueous solution using ammonium peroxodisulfate (APS) at 4 oC for 24h. The lower critical solution temperatures (LCSTs) of the comb-type grafted hydrogels were decreased with increase of t-BAM content in the grafted copolymer. We observed the effect of crosslinker and concentration of oligo(NIPAAm-co-t-BAM) on the shrinking/swelling ratio of hydrogels. Changes of shrinking/swelling ratio were decreased with increase of concentration of crosslinker. The increase of grafted oligo(NIPAAm-co-t-BAM) in the hydrogel shows an fast changes of shrinking/ swelling rate. The comb-type grafted hydrogels are expected to be valuable for the sensing materials of time-temperature labels(TTLs).
Keywords
N-isopropylacrylamide; Hydrogel; LCST; Cold Chain; Swelling;
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