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
Shu-xun Cui (崔树勋), E-mail: cuishuxun@swjtu.edu.cn
收稿:2015-11-02,
修回:2015-11-16,
录用:2015-11-17,
纸质出版:2016-05
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Xiang-chao Pang, Bo Cheng, Shu-xun Cui. The Solvent Quality of Water for Poly(
Xiang-chao Pang, Bo Cheng, Shu-xun Cui. The Solvent Quality of Water for Poly(
Xiang-chao Pang, Bo Cheng, Shu-xun Cui. The Solvent Quality of Water for Poly(
Xiang-chao Pang, Bo Cheng, Shu-xun Cui. The Solvent Quality of Water for Poly(
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.
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