Abstract
Poly(NIPAM-co-AAC) (P(NI-AC)) was synthesized by changing the polymerization conditions using poly(N-isopropylacrylamide) (NIPAM) as temperature-responsive polymer and acrylic acid (AAC). Thermosensing color indicators, that changes color depending on the external temperature, were fabricated using P(NI-AC), a pH indicator, and agar. The pH of the P(NI-AC) aqueous solution increased above the lower critical solution temperature (LCST, 34°C), and a gradual pH rise and the shrinkage of aggregate diameter continued up to 70 °C under conditions with high AAC polymerization ratio. The LCST of P(NI-AC) aqueous solution with glucose decreased, and the discoloration temperature range of the thermosensing color indicator with glucose shifted to lower temperature side from 37 to 30°C. The LCST of polymer synthesized with NIPAM, AAC, and N,N-dimethylacrylamide (DMA) increased, and the discoloration temperature range of the thermosensing color indicator shifted to higher temperature side from 39 to 50°C. These results indicated that the discoloration temperature range was successfully adjusted by as much as 20 °C.
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