Understanding the Conformational Interconversions of a Polymer Chain in a Liquid Environment at the Single-molecule Level

doi:10.1007/s40242-023-3087-0

Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (5): 840-844.doi: 10.1007/s40242-023-3087-0

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Understanding the Conformational Interconversions of a Polymer Chain in a Liquid Environment at the Single-molecule Level

SHAO Yue¹, WEI Junhao¹, BAO Yu¹, CAI Wanhao¹, QIAN Lu¹, CUI Shuxun¹

School of Chemistry, Key Lab of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P. R. China

Received:2023-04-05 Online:2023-10-01 Published:2023-09-26
Contact: BAO Yu, CUI Shuxun E-mail:baoyu@swjtu.edu.cn;cuishuxun@swjtu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (No.22273079), the Natural Science Foundation of Sichuan Province, China (No.2022NSFSC1204), and the Central Government Guiding Local Science and Technology Development Project of Sichuan Province, China (No.2022ZYD0043).

Abstract

Abstract: The conformational interconversions of polymer chains have been of great interest as a basic scientific issue. Single-molecule force spectroscopy (SMFS) is a powerful tool for molecular manipulation, which enables experimental studies on the single-chain behaviors of polymers. The SMFS results show that an individual polymer chain in a liquid environment may have similar properties to an ideal chain, which contradicts the traditional theoretical view. Herein, by taking into account the collisions of solvent molecules, the conformational interconversions of a single polymer chain in a liquid environment have been analyzed. The conformational interconversion frequency of a carbon-carbon bond of an alkane chain can be estimated by establishing the relationship between the internal rotation barriers of small molecules (monomers) and the corresponding macromolecules. Since the time scale of conformational interconversions of the polymer backbone is much shorter than that of SMFS experiments, most polymers with C-C backbones behave as ideal chains in liquid environments.

Key words: C-C bond, Internal rotation barrier, Conformational interconversion

SHAO Yue, WEI Junhao, BAO Yu, CAI Wanhao, QIAN Lu, CUI Shuxun. Understanding the Conformational Interconversions of a Polymer Chain in a Liquid Environment at the Single-molecule Level[J]. Chemical Research in Chinese Universities, 2023, 39(5): 840-844.

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Understanding the Conformational Interconversions of a Polymer Chain in a Liquid Environment at the Single-molecule Level

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