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Direct Assembly of Micrometer-Long Polymeric Cylinders in Water via Supramolecular Sticker Engineering.

Sébastien Berruée1, Jean-Michel Guigner2, Cécile Huin1,3

  • 1Institut Parisien de Chimie Moléculaire (IPCM), Sorbonne Université, CNRS, Paris, France.

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Summary

This study presents a direct, solvent-free method for creating well-organized polymer nanocylinders in water using functionalized poly(N,N-dimethylacrylamide) (PMDAc). The addition of tri(ethylene glycol) (TEG) units improved nanocylinder assembly and stability.

Keywords:
RAFT polymerizationanisotropic nanostructuresperylene diimide (PDI)self‐assemblysupramolecular structure‐directing unit (SSDU)

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Developing functional nanomaterials often requires organic solvents and complex processing.
  • Controlling the morphology of self-assembled polymers is crucial for advanced applications.

Purpose of the Study:

  • To develop a direct, solvent-free method for producing well-organized polymer nanocylinders in water.
  • To investigate the role of perylene diimide (PDI) functionalization and tri(ethylene glycol) (TEG) units in polymer self-assembly.
  • To achieve precise morphological control over nanomaterial formation.

Main Methods:

  • RAFT polymerization was used to synthesize poly(N,N-dimethylacrylamide) (PMDAc) functionalized with perylene diimide (PDI) at one chain end.
  • Two types of PDI RAFT agents were studied: one with and one without tri(ethylene glycol) (TEG) units.
  • The self-assembly behavior of the resulting PDI-PMDAc conjugates in water was analyzed using fluorescence spectroscopy and morphological observations.

Main Results:

  • PDI-PMDAc conjugates spontaneously self-assembled into micrometer-long nanocylinders in water, driven by H-aggregate π-π interactions.
  • The presence of TEG units prevented the aggregation and formation of ill-defined structures observed in the TEG-free system.
  • Polymer chains with a degree of polymerization (DPn) below 24 and TEG units self-assembled into well-organized micrometer-long nanocylinders.
  • Heating accelerated self-assembly and increased solution viscosity, with fluorescence indicating enhanced PDI H-aggregate organization in cylinders.

Conclusions:

  • A sustainable, solvent-free method for producing well-organized polymer nanocylinders was established.
  • Tri(ethylene glycol) functionalization is key for controlling the morphology and stability of PDI-PMDAc nanocylinders in aqueous media.
  • This approach offers precise morphological control for developing advanced functional nanomaterials.