Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (4): 20210863.doi: 10.7503/cjcu20210863

• Polymer Chemistry • Previous Articles     Next Articles

Quantifying the Degree of Weakening Effect of Nonpolar Organic Solvent on the Strength of Intramolecular Hydrogen Bonding by Single-molecule Force Spectroscopy

ZHANG Yong, XU Jun, BAO Yu(), CUI Shuxun()   

  1. Key Lab of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China
  • Received:2021-12-27 Online:2022-04-10 Published:2022-02-12
  • Contact: BAO Yu,CUI Shuxun E-mail:baoyu@swjtu.edu.cn;cuishuxun@swjtu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21604013);the Fundamental Research Funds for the Central Universities, China(2682020ZT105)

Abstract:

The influence degree of nonpolar organic solvents on the strength of intramolecular hydrogen bonding (H-bond) have been quantitatively studied by taking three kinds of polyvinyl alcohol(PVA) with different alcoholysis degrees as the model system in this paper. The single-molecule force spectroscopy(SMFS) results show that the strengths of intramolecular H-bonds in three kinds of PVA in nonpolar organic solvents are ca.48% of those in vacuum. These findings indicate that the nonpolar organic solvent has a significant weakening effect on the intramole-cular H-bond, which can weaken its strength by ca.50%. This study suggests that the influence of liquid environments on the strengths of non-covalent interactions and the single-chain elasticities of polymers should be reconsi-dered.

Key words: Intramolecular hydrogen bonding, Single-molecule force spectroscopy, Vacuum, Nonpolar organic solvent, Poly(vinyl alcohol)

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