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Nakano S, Ogiso T, Kita R, et al. Thermoreversible gelation of isotactic-rich poly(N-isopropylacrylamide) in water. J Chem Phys. 2011;135(11):114903doi: 10.1063/1.3637943.
Nakano, S., Ogiso, T., Kita, R., Shinyashiki, N., Yagihara, S., Yoneyama, M., & Katsumoto, Y. (2011). Thermoreversible gelation of isotactic-rich poly(N-isopropylacrylamide) in water. The Journal of chemical physics, 135(11), 114903. https://doi.org/10.1063/1.3637943
Nakano, Shinya, et al. "Thermoreversible gelation of isotactic-rich poly(N-isopropylacrylamide) in water." The Journal of chemical physics vol. 135,11 (2011): 114903. doi: https://doi.org/10.1063/1.3637943
Nakano S, Ogiso T, Kita R, Shinyashiki N, Yagihara S, Yoneyama M, Katsumoto Y. Thermoreversible gelation of isotactic-rich poly(N-isopropylacrylamide) in water. J Chem Phys. 2011 Sep 21;135(11):114903. doi: 10.1063/1.3637943. PMID: 21950883.
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J Chem Phys. 2011 Sep 21;135(11):114903. doi: 10.1063/1.3637943.

Thermoreversible gelation of isotactic-rich poly(N-isopropylacrylamide) in water.

The Journal of chemical physics

Shinya Nakano, Takao Ogiso, Rio Kita, Naoki Shinyashiki, Shin Yagihara, Masaru Yoneyama, Yukiteru Katsumoto

Affiliations

  1. Department of Physics, Tokai University, Hiratsuka 259-1292, Japan.

PMID: 21950883 DOI: 10.1063/1.3637943

Abstract

We report the experimentally determined phase diagram for an aqueous solution of isotactic-rich poly(N-isopropylacrylamide) (PNiPAM) composed of the sol-gel transition curve and the cloud-point curve. The meso diad content of isotactic-rich PNiPAM is 64%, and it is soluble in water at low temperatures, but undergoes a sol-to-gel transition with increasing temperature in the investigated concentration range of 1.8 wt. %-6.0 wt. %. With a further increase in temperature, the system becomes turbid. The gel formation and clouding behavior are thermally reversible. This is the first observation of thermoreversible gelation under the cloud-point temperature for an aqueous solution of PNiPAM. On the basis of the determined phase diagram, we carried out light scattering experiments to characterize the sol-gel transition behavior as a function of temperature.

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