Amphiphilic core-shell nanocarriers based on hyperbranched poly(ester amide)-star-PCL: synthesis, characterization,...

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Biodegradable polymers are crucial for biomedical applications.
• Star-shaped polymers offer unique architectures for advanced materials.
• Hyperbranched polymers can serve as complex macroinitiators.

Purpose of the Study:

• To synthesize amphiphilic biodegradable star polymers.
• To characterize their structure and self-assembly behavior.
• To evaluate their potential as nanocarriers for drug delivery.

Main Methods:

• Ring-opening polymerization of epsilon-caprolactone (CL) using a hyperbranched poly(ester amide) (PEA) macroinitiator.
• Characterization using 1H NMR, FTIR, and SEC with triple detectors.
• Dynamic light scattering (DLS) to confirm micellar structure.
• Host-guest studies with water-soluble dyes to assess loading efficiency.

Main Results:

• Successful synthesis of star polymers with controlled PCL arm lengths.
• Confirmation of star architecture and high initiation efficiency.
• Formation of inverted unimolecular micelles with a hydrophilic PEA core and hydrophobic PCL shell.
• Efficient transport of polar dyes (Congo red, methyl orange, bromophenol blue) from aqueous to organic phases (up to 22.6 dyes/polymer).

Conclusions:

• The synthesized star polymers self-assemble into reverse unimolecular micelles.
• These micelles demonstrate high efficiency in transporting polar molecules.
• The star polymers show significant potential as nanocarriers for drug delivery applications.