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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Block copolymers (BCPs) form nanoparticles with potential applications in drug delivery, sensors, and catalysis.
  • Disk-like BCP nanoparticles show promise for antitumor drug delivery but lack stimuli-responsive properties.
  • Existing nanodisks have limited applicability due to poor or unknown response to external stimuli.

Purpose of the Study:

  • To demonstrate that simple symmetric diblock copolymers can form equilibrium nanodisks.
  • To show these nanodisks can reversibly transform into various nanoparticle morphologies.
  • To explore the potential of these tunable nanoparticles for advanced applications.

Main Methods:

  • Self-consistent field theory (SCFT) calculations were employed.
  • An algorithm was designed to produce equilibrium nanoparticle morphology.
  • The effect of block-block and polymer-solvent incompatibility was investigated.

Main Results:

  • Equilibrium nanodisks were formed from symmetric diblock copolymers.
  • Nanodisks reversibly transformed into diverse structures: patchy, onion-like, striped ellipsoids, mixed morphology colloids, and spherical micelles.
  • Morphological transitions were sharp and tunable by adjusting incompatibility parameters.
  • Versatility was achieved at nanoparticle sizes around two lamellar periods.
  • Larger assemblies and complex structures like chain-like aggregates and multilayered disks were formed upon aggregation.

Conclusions:

  • Symmetric diblock copolymers can form highly tunable nanodisks.
  • These nanodisks serve as a versatile platform for stimuli-responsive nanoparticles.
  • The findings open avenues for next-generation nanophotonics and biomedical applications.