Amphiphilic tri- and tetra-block co-polymers combining versatile functionality with facile assembly into...

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomaterials Engineering

Background:

• Synthetic polymers are crucial for biomaterials, requiring easy synthesis from available building blocks.
• Biomaterials need to be biocompatible and adaptable for diverse physical properties and functionalization.
• Current methods often lack versatility in creating complex polymer architectures for advanced applications.

Purpose of the Study:

• To develop a versatile and metal-free synthesis platform for amphiphilic block copolymers.
• To create adaptable biomaterials with controlled architectures and functionalities for sensing or therapy.
• To demonstrate the utility of these polymers in forming nanoparticles and their biocompatibility.

Main Methods:

• Ring-opening polymerization (ROP) of lactide and functionalized cyclic carbonates using diazabicyclo[5.4.0]undec-5-ene (DBU) catalyst.
• Utilized PEGylated macroinitiators and a labile-ester methacrylate initiator for controlled polymer synthesis.
• Employed tandem reactions, including thiol-ene click and RAFT polymerization, for further polymer modification.

Main Results:

• Successfully synthesized amphiphilic tri- and tetra-block copolymers with controlled monomer incorporation, molar masses, and functionalities.
• Demonstrated high fidelity of hydroxyl end groups and successful secondary ROP chain extension.
• Achieved facile deprotection of side-chain amines for drug conjugation and formation of micellar nanoparticles.
• Non-cationic polymers exhibited good biocompatibility with MCF-7 breast cancer cells.

Conclusions:

• A rapid and facile metal-free ROP route enables the synthesis of highly adaptable amphiphilic block copolymers.
• These polymers offer tunable properties and functionalities for diverse biomaterial applications, including drug delivery.
• The developed platform shows significant promise for creating next-generation biomaterials with enhanced therapeutic potential.