Aggregation behaviour of peptide-polymer conjugates containing linear peptide backbones and multiple polymer side...

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Supramolecular Chemistry

Background:

• Peptide-polymer conjugates are advanced materials with tunable properties.
• Controlled synthesis of these conjugates is crucial for developing novel functional materials.

Purpose of the Study:

• To synthesize peptide-polymer conjugates using alkoxyamine-functionalized peptides as initiators.
• To investigate the controlled polymerization and self-assembly behavior of these hybrid materials.

Main Methods:

• Synthesis of peptides with alternating alkoxyamine-conjugated lysine and glycine residues via solution phase peptide coupling.
• Nitroxide-mediated polymerization (NMP) of styrene and N-isopropylacrylamide (NIPAM) using peptide initiators.
• Characterization of polymer conjugates using gel permeation chromatography (GPC), dynamic light scattering (DLS), and atomic force microscopy (AFM).

Main Results:

• Peptide-polymer conjugates with well-defined linear peptide backbones and controlled numbers of polymer side chains were successfully synthesized.
• Highly controlled polymerization of styrene and NIPAM was achieved, with molecular weight and polydispersity index (PDI) determined by GPC.
• The conjugates exhibited diverse aggregation topologies, including honeycomb structures for peptide-polystyrene and varied patterns for peptide-poly-N-isopropylacrylamide, depending on composition and polymer chain characteristics.

Conclusions:

• Alkoxyamine-functionalized peptides serve as effective initiators for controlled NMP, enabling the synthesis of well-defined peptide-polymer conjugates.
• The self-assembly behavior of these hybrid materials is highly dependent on the polymer side chains, leading to distinct supramolecular structures.
• These findings open avenues for designing sophisticated peptide-polymer architectures for various applications.