Citation: Xiang-chao Pang, Bo Cheng, Shu-xun Cui. The Solvent Quality of Water for Poly(N-isopropylacrylamide) in the Collapsed State: Implications from Single-molecule Studies[J]. Chinese Journal of Polymer Science, ;2016, 34(5): 578-584. doi: 10.1007/s10118-016-1773-9 shu

The Solvent Quality of Water for Poly(N-isopropylacrylamide) in the Collapsed State: Implications from Single-molecule Studies

Xiang-chao Pang ^a,b ,
Bo Cheng ^a,c ,
Shu-xun Cui ^a,,

a.
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China
b.
Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, China
c.
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China

Corresponding author: Shu-xun Cui, cuishuxun@swjtu.edu.cn
Received Date: 2 November 2015
Revised Date: 16 November 2015
Accepted Date: 17 November 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China 21074102This work was financially supported by the National Natural Science Foundation of China 21222401

Both of temperature (in water) and composition (in the water/methanol mixed solvent) can induce the coil-to-globule transition of poly(N-isopropylacrylamide) (PNIPAM). The atomic force microscope (AFM) based single molecule force spectroscopy (SMFS) has been exploited to investigate the interactions between the polymer chain and solvent at the single-molecule level. It is found that the single-chain mechanics of PNIPAM show a remarkable dependence on the two external stimuli. A confusing experimental result is that all the force-extension (F-E) curves of unfolding an individual PNIPAM globule present a feature of elastic (monotonically increasing force) stretching but not plateau (constant force) stretching predicted by theory. In this article, we clarify that the presence of the interior solvent molecules in the single-chain globule is the origin of the discrepancy between the F-E curves obtained from theory and experiment. Although both of the external stimuli do tend to lower the solvent quality for PNIPAM, water and the water/methanol mixed solvent will never be the strongly poor solvent for PNIPAM, even at the worst condition.
- PNIPAM,
- Unfolding of the globule,
- Elastic stretching,
- Interior solvent
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