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Synthesis and characterization of thermo-sensitive poly (N-isopropylacrylamide) hydrogel with fast response rate

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Frontiers of Chemistry in China

Abstract

Thermo-sensitive poly (N-isopropylacrylamide) (PNIPA) hydrogel with fast response rate was prepared by polymerizing N-isopropylacrylamide (NIPA) in an aqueous hydroxyl-propyl-methyl cellulose solution. The volume phase transition temperature of PNIPA hydrogels was characterized by differential scanning calorimetry (DSC), and the surface morphology was observed by scanning electron microscopy (SEM). The swelling ratios of the hydrogels at different temperatures were measured. Furthermore, the deswelling kinetics of the hydrogels was also studied by measuring their water retention capacity. In comparison with a conventional PNIPA hydrogel prepared in water, the hydrogel synthesized in aqueous hydroxyl-propyl-methyl cellulose solution has higher swelling ratios at temperatures below the lower critical solution temperature and exhibits a much faster response rate to temperature changes. For example, the hydrogel made in aqueous hydroxyl-propyl-methyl cellulose solution lost 89% water within 1 min and about 93% water in 4 min, whereas the conventional hydrogel lost only about 66% water in 15 min from the deswelling measurement in similar conditions.

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Authors and Affiliations

  1. Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 501650, China

    Qin Aixiang, Lu Mangeng, Liu Qunfeng & Zhang Ping

  2. Department of Chemistry, Graduate School of Chinese Academy of Sciences, Beijing, 100039, China

    Qin Aixiang, Liu Qunfeng & Zhang Ping

Authors
  1. Qin Aixiang
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  2. Lu Mangeng
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  3. Liu Qunfeng
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  4. Zhang Ping
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Corresponding author

Correspondence to Lu Mangeng.

Additional information

Translated from Chinese Journal of Applied Chemistry, 2006, 23(6): 581–585 (in Chinese)

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Qin, A., Lu, M., Liu, Q. et al. Synthesis and characterization of thermo-sensitive poly (N-isopropylacrylamide) hydrogel with fast response rate. Front. Chem. China 2, 135–139 (2007). https://doi.org/10.1007/s11458-007-0028-2

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  • DOI: https://doi.org/10.1007/s11458-007-0028-2

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