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Probing Polymer Chain Folding in Solution Using Second Harmonic Light Scattering.

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Summary

Periodically grafted amphiphilic copolymers (PGACs) transition to a zigzag folded chain in solution. This folding induces directional ordering of chromophoric dipoles, a key finding for materials science.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Periodically grafted amphiphilic copolymers (PGACs) exhibit a zigzag folded conformation in the solid state, leading to segregated backbone and pendant segments in lamellar structures.
  • The conformational transition of PGACs from random coils to zigzag folded chains in solution is an underexplored area with significant implications for materials self-assembly.

Purpose of the Study:

  • To investigate the conformational transition of PGACs from random coils to zigzag folded chains in solution.
  • To examine the induced directional ordering of chromophoric dipoles within these folded polymer chains.
  • To understand the role of segment-selective solvents in controlling polymer conformation and dipole alignment.

Main Methods:

  • Synthesis of PGACs via orthogonal click chemistry, sequentially grafting poly(ethylene glycol) (PEG) segments with and without a dipolar chromophore onto a polyester backbone.
  • Induction of polymer folding by adding a polar solvent (methanol) to a chloroform solution, causing selective desolvation of the hydrocarbon backbone.
  • Monitoring of chromophore alignment using second harmonic light scattering (SHLS) by measuring the intensity of frequency-doubled scattered light (I2ω).

Main Results:

  • SHLS intensity (I2ω) increased with methanol concentration, indicating folding and directional alignment of chromophoric dipoles in PGACs.
  • An analogous model chromophore showed invariant I2ω with solvent composition, confirming the folding-induced alignment in PGACs.
  • A model PGAC with chromophores on every repeat unit showed decreased I2ω, suggesting the formation of centrosymmetric folded chains with canceled dipoles.

Conclusions:

  • Segment-selective solvents can effectively induce zigzag chain folding in PGACs in solution.
  • This controlled folding leads to the elusive directional ordering of chromophoric dipoles, opening avenues for novel functional materials.
  • The study provides a new method for controlling polymer conformation and achieving dipole alignment in solution-phase systems.