MMA/DVB emulsion surface graft polymerization initiated by UV light

Area of Science:

• Polymer Chemistry
• Materials Science
• Surface Science

Background:

• Surface modification of polymers is crucial for tailoring material properties.
• Graft polymerization offers a versatile method for surface functionalization.
• Photoinitiated grafting provides spatial control over surface modification.

Purpose of the Study:

• To graft methyl methacrylate/1,2-divinylbenzene (MMA/DVB) onto a polymeric substrate using UV light and benzophenone (BP) photoinitiation.
• To characterize the surface properties and graft layer formed.
• To propose a model for the surface graft polymerization process.

Main Methods:

• Graft polymerization of MMA/DVB emulsion onto a CPP substrate under UV irradiation with BP photoinitiator.
• Gravimetric analysis for monomer conversion, grafting efficiency, and yield.
• ATR-IR, AFM, and TEM for surface characterization and topography analysis.

Main Results:

• Successful grafting of MMA/DVB onto the CPP substrate with controlled graft layer thickness (0.09-1.5 microm).
• Monomer conversion ranged from 15-55%, with grafting efficiency around 80% and yield up to 5%.
• AFM revealed a graft layer composed of 30-50 nm nanoparticles covalently bonded to the substrate.

Conclusions:

• UV-initiated graft polymerization of MMA/DVB is an effective method for polymer surface modification.
• The resulting graft layer exhibits a unique nanoparticle structure.
• A surface graft polymerization model involving initiation, nucleation, and growth is proposed.