Study on the Complex Interaction betweetn Poly(vinyl alcohol) and Iodine Complex by Single-molecule Force Spectroscopy

Xin-xin Bao; Lu Qian; Xiao-bo Huang; Song Zhang; Jian Wang; Yu Bao; Shu-xun Cui

doi:10.11777/j.issn1000-3304.2023.23067

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Study on the Complex Interaction betweetn Poly(vinyl alcohol) and Iodine Complex by Single-molecule Force Spectroscopy

Research Article | 更新时间：2023-08-21

- Study on the Complex Interaction betweetn Poly(vinyl alcohol) and Iodine Complex by Single-molecule Force Spectroscopy
  增强出版
- ACTA POLYMERICA SINICA Vol. 54, Issue 9, Pages: 1355-1362(2023)
- 作者机构：
  
  材料先进技术教育部重点实验室西南交通大学化学学院成都 610031
- 作者简介：
  
  Yu Bao, E-mail: baoyu@swjtu.edu.cn
  Shu-xun Cui, E-mail: cuishuxun@swjtu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2023.23067
  CLC：
- Published：20 September 2023，
  
  Published Online：04 June 2023，
  
  Received：22 March 2023，
  
  Accepted：28 April 2023
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包鑫鑫,钱露,黄晓波等.聚乙烯醇-碘复合物相互作用的单分子力谱研究[J].高分子学报,2023,54(09):1355-1362.

Bao Xin-xin,Qian Lu,Huang Xiao-bo,et al.Study on the Complex Interaction betweetn Poly(vinyl alcohol) and Iodine Complex by Single-molecule Force Spectroscopy[J].ACTA POLYMERICA SINICA,2023,54(09):1355-1362.
包鑫鑫,钱露,黄晓波等.聚乙烯醇-碘复合物相互作用的单分子力谱研究[J].高分子学报,2023,54(09):1355-1362. DOI： 10.11777/j.issn1000-3304.2023.23067.

Bao Xin-xin,Qian Lu,Huang Xiao-bo,et al.Study on the Complex Interaction betweetn Poly(vinyl alcohol) and Iodine Complex by Single-molecule Force Spectroscopy[J].ACTA POLYMERICA SINICA,2023,54(09):1355-1362. DOI： 10.11777/j.issn1000-3304.2023.23067.

摘要

为了更加深入地研究聚乙烯醇(PVA)-碘复合物的最可能结构，利用单分子力谱技术对PVA与碘、直链淀粉与碘的相互作用进行了对照研究. 实验结果显示PVA与碘离子之间并不存在类似于直链淀粉与碘离子的特殊单分子力谱信号，即：PVA与碘不能形成螺旋结构，单链模型不是PVA与碘相互作用的主要方式. 本工作为进一步研究PVA-碘复合物的多链模型奠定了基础.

Abstract

The poly(vinyl alcohol)(PVA)‍-iodine complex has been widely used in industry due to its unique optical dichroism. The properties of PVA-iodine composites are closely related to their interaction modes and strength. However

due to the complexity of the studied systems

there is still no consensus on the exact structure of the PVA-iodine complex. According to the number of PVA chains in the complex model

the existing models can be divided into the single-chain model and multi-chain model. The single-chain model is proposed based on the helical structure model of the amylose-iodine complex. Thus

to investigate the most probable structure of the PVA-iodine complex

the interactions between PVA-iodine and amylose-iodine have been investigated by single-molecule force spectroscopy in deionized (DI) water and KI/I

solution

respectively. When the single amylose chain is stretched in DI water

the sugar ring will undergo a chair-boat conformational transition

showing a shoulder plateau on the force-extension (

) curves. When it is stretched in KI/I

solution

a long plateau (~40 pN) will appear except the shoulder plateau

which corresponds to the unwinding of the helical structure in the amylose-iodine complex. However

the

curves of PVA obtained in the KI/I

solution only contain a single peak and do not exhibit a long plateau similar to that of amylose in the KI/I

solution. Moreover

the

curves of PVA obtained in DI water and KI/I

solutions with different concentrations can be superposed well after normalization. The experimental results show that the interaction between PVA and iodine ions is different from that between amylose and iodine ions. In other words

the PVA-iodine complex does not exist in a helical structure

and the single-chain model is not suitable to describe the interaction between PVA and iodine. This study lays the foundation for further study of the multi-chain model of the PVA-iodine complex.

关键词

聚乙烯醇-碘复合物直链淀粉-碘复合物单分子力谱螺旋结构

Keywords

PVA-iodine complexAmylose-iodine complexSingle-molecule force spectroscopyHelical structure

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