Abstract
A novel pH- and temperature-responsive poly (N-isopropyl acrylamide/itaconic acid/acrylamide)(NIPAM/IA/AM) hydrogel was synthesized by inverse microemulsion polymerization and crosslinker effects on its swelling and gel properties were investigated. Water absorbency and salt solution absorbency increased with crosslinker amount increased to 0.2 wt%, and then decreased, while pH-sensitivity decreased and gel strength, temperature-and shear- resistance increased with increased crosslinker amount. The average particle size of the NIPAM/IA/AM hydrogels synthesized at crosslinker amount of 0.2 and 0.4 wt%, increased from 0.45 and 0.38 μm to 11.86 and 9.88 μm, respectively, with swelling time from 1 to 15 h. The NIPAM/IA/AM hydrogel demonstrated shear-thinning behavior and increased gel strength from 25 to 35 °C.
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Acknowledgments
The authors gratefully acknowledge the financial support of PetroChina Innovation Foundation, China (Grant No. 2012D-5006-0212), Sichuan Provincial Science and Technology Pillar Program, China (Grant No. 2013GZ0149), Opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, China (Grant No. SKLGP2012K004) and the Sichuan Youth Science and Technology Innovation Research Team Funding Scheme, China (Grant No. 2013TD0005).
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Wan, T., Xiong, J., Zhao, Q. et al. Crosslinker effects on swelling and gel properties of pH- and temperature-responsive poly (NIPAM/IA/AM) hydrogels. Polym. Bull. 73, 1447–1458 (2016). https://doi.org/10.1007/s00289-015-1557-3
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DOI: https://doi.org/10.1007/s00289-015-1557-3