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Frontal polymerization synthesis and characterization of temperature- and pH-sensitive hydrogels

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Abstract

The temperature- and pH-sensitive hydrogels, poly(N-isopropylacrylamide-co-acrylic acid) (P(NIPAM-co-AAc)), were synthesized via frontal polymerization (FP). The reaction components have been varied in order to find their influences on frontal parameters and copolymer features. The results showed that front velocity and front temperature were dependent on the initiator concentration, reactant dilution, and NIPMA/AAc molar ratio. In addition, the morphology and sensitive behavior of the FP hydrogels were mainly affected by monomers’ ratio. Namely, the pore size, swelling abilities, LCST, and response kinetics of copolymer hydrogels obviously increased with the increasing acrylic acid concentration; however, they slightly changed with varying of amounts of initiator and solvent. Finally, in comparison with the hydrogels prepared by conventional batch polymerization, the ones synthesized by frontal polymerization exhibited more homogeneous chain composition and improved microstructure and response ability.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (grant no. 50772013), the Foundation for University Key Teacher by the He’nan Educational Committee (no. 2011GGJS-168), and the Technology Foundation for Key Project of Science and Technology Department of He’nan of China (no. 122102310430).

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Authors and Affiliations

  1. Department of Chemistry and Chemical Engineering, Henan University of Urban Construction, Pingdingshan, Henan, 467000, China

    Qiao Feng

  2. Laboratory of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Qiao Feng, Qingzhi Yan & Changchun Ge

Authors
  1. Qiao Feng
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  2. Qingzhi Yan
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  3. Changchun Ge
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Correspondence to Qingzhi Yan.

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Feng, Q., Yan, Q. & Ge, C. Frontal polymerization synthesis and characterization of temperature- and pH-sensitive hydrogels. Colloid Polym Sci 291, 1163–1170 (2013). https://doi.org/10.1007/s00396-012-2844-2

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  • DOI: https://doi.org/10.1007/s00396-012-2844-2

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