Role of hydrogen bonding in solubility of poly(N-isopropylacrylamide) brushes in sodium halide solutions

doi:10.1088/1674-1056/25/7/074703

Abstract By employing molecular theory, we systematically investigate the shift of solubility of poly(N-isopropylacrylamide) (PNIPAM) brushes in sodium halide solutions. After considering PNIPAM-water hydrogen bonds, water-anion hydrogen bonds, and PNIPAM-anion bonds and their explicit coupling to the PNIPAM conformations, we find that increasing temperature lowers the solubility of PNIPAM, and results in a collapse of the layer at high enough temperatures. The combination of the three types of bonds would yield a decrease in the solubility of PNIPAM following the Hofmeister series: NaCl >NaBr >NaI. PNIPAM-water hydrogen bonds are affected by water-anion hydrogen bonds and PNIPAM-anion bonds. The coupling of polymer conformations and the competition among the three types of bonds are essential for describing correctly a decrease in the solubility of PNIPAM brushes, which is determined by the free energy associated with the formation of the three types of bonds. Our results agree well with the experimental observations, and would be very important for understanding the shift of the lower critical solution temperature of PNIPAM brushes following the Hofmeister series.

Keywords: molecular theory PNIPAM brushes anion effect hydrogen bonds

Received: 05 September 2015
Revised: 13 February 2016
Accepted manuscript online:

PACS:	47.27.eb	(Statistical theories and models)
	05.65.+b	(Self-organized systems)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 21264016, 11464047, and 21364016) and the Joint Funds of Xinjiang Natural Science Foundation, China (Grant No. 2015211C298).

Corresponding Authors: Xin-Jun Zhao
E-mail: zhaoxinjunzxj@163.com

Cite this article:

Xin-Jun Zhao(赵新军), Zhi-Fu Gao(高志福) Role of hydrogen bonding in solubility of poly(N-isopropylacrylamide) brushes in sodium halide solutions 2016 Chin. Phys. B 25 074703

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Role of hydrogen bonding in solubility of poly(N-isopropylacrylamide) brushes in sodium halide solutions

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