The solvent quality of water for poly(N-isopropylacrylamide) in the collapsed state: Implications from single-molecule studies

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• 作者：Xiang-chao Pang ; Bo Cheng ; Shu-xun Cui 崔树剿/a>
• 关键词：PNIPAM ; Unfolding of the globule ; Elastic stretching ; Interior solvent
• 刊名：Chinese Journal of Polymer Science
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：34
• 期：5
• 页码：578-584
• 全文大小：550 KB
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• 作者单位：Xiang-chao Pang (1) (2)
  Bo Cheng (1) (3)
  Shu-xun Cui 崔树勋 (1)
  
  1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu, 610031, China
  2. Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, 518055, China
  3. School of Mechanical and Power Engineering, North University of China, Taiyuan, 030051, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Condensed Matter Physics
  Industrial Chemistry and Chemical Engineering
  Polymer Sciences
  Characterization and Evaluation of Materials
  
• 出版者：Chinese Chemical Society and Institute of Chemistry, CAS, co-published with Springer
• ISSN：1439-6203

文摘

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.