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Quantifying the Chain Folding in Polymer Single Crystals by Single-Molecule Force Spectroscopy.

Ziwen Ma1, Peng Yang1, Xiaoye Zhang1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.

ACS Macro Letters
|May 27, 2022
PubMed
Summary

We developed a new atomic force microscopy (AFM) method to precisely measure chain folding in polymers. This technique reveals high adjacent re-entry fold fractions, crucial for understanding polymer crystallization kinetics.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Chain folding is a fundamental aspect of polymer crystallization, influencing crystallization kinetics.
  • Experimental quantification of chain folding is challenging due to limitations in instrumental resolution.

Purpose of the Study:

  • To develop and validate a novel method for quantifying chain folding in polymer crystals.
  • To investigate the types of chain folding (adjacent vs. nonadjacent re-entry) with high spatial resolution.

Main Methods:

  • Utilized atomic force microscopy (AFM)-based single-molecule force spectroscopy.
  • Analyzed the fingerprint spectrum of force-induced chain motion to differentiate folding types.
  • Achieved subnanometer spatial resolution for chain folding analysis.

Main Results:

  • Quantified chain folding in solution-grown single crystals of polycaprolactone, poly-l-lactic acid, and polyamide 66.
  • Determined average adjacent re-entry fold fractions (⟨f⟩) between 91-95%.
  • Observed higher adjacent re-entry fold fractions compared to classical polymer characterization techniques.

Conclusions:

  • The developed single-molecule force spectroscopy method accurately quantifies chain folding.
  • The high adjacent re-entry fold fractions suggest efficient chain packing in these polymers.
  • This method is broadly applicable to various crystalline polymer systems.