Combining RAFT Dispersion Polymerization and Surface-Initiated ATRP for Surface Engineering of Polymeric Microspheres

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Developing methods for creating uniform polymeric microspheres with controlled surface functionality is crucial for advanced applications.
• Existing polymerization techniques often face limitations in achieving precise control over both particle size and surface chemistry simultaneously.

Purpose of the Study:

• To develop an orthogonal polymerization strategy integrating RAFT and ATRP for the synthesis of monodisperse, surface-functional polymeric microspheres.
• To demonstrate the versatility of this approach in creating complex graft copolymer architectures and functional surfaces.

Main Methods:

• Utilized photoinitiated RAFT dispersion polymerization of methyl methacrylate (MMA) using ATRP initiator-functionalized macro-RAFT agents.
• Performed subsequent surface-initiated ATRP to graft various polymer chains (PDMAEMA, PNIPAM, PDMA, PPEGMA) onto the microsphere surface.
• Incorporated trithiocarbonate comonomers for orthogonal surface-initiated RAFT polymerizations to create graft copolymers.

Main Results:

• Successfully synthesized uniform PMMA microspheres with surface-bound ATRP initiators.
• Achieved grafting of diverse polymer chains via surface-initiated ATRP without compromising particle uniformity.
• Demonstrated the creation of graft copolymer architectures through sequential orthogonal polymerizations.

Conclusions:

• The modular ATRP-RAFT approach provides precise control over microsphere morphology and surface chemistry.
• This versatile platform enables the construction of functional polymeric microspheres for diverse applications.
• The developed method offers a powerful tool for advanced polymer material design.