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Reversible Addition-Fragmentation Chain-Transfer (Raft) Polymerization In Grafting Polymer Chains From Tio2 Nanoparticles, Joseph Lott
Theses
A phosphonate coupling molecule containing a vinyl double bond was synthesized and anchored onto the surface of TiO2 nanoparticles. Diffuse reflectance infra-red (DRIFT) spectroscopy confirmed the presence of the coupling molecule on the particulate surface while thermogravimetric analysis revealed the coupling molecule covered 28% of the surface. Methyl methacrylate was free radically polymerized through the immobilized vinyl bond on the surface in the presence of the reversible additionfragmentation chain-transfer (RAFT) agent 4-cyanopentanoic acid dithiobenzoate using 2,2'-azobisisobutylnitrile (AIBN) as an initiator. DRIFT measurements confirmed the presence of methacrylate groups on the surface. Differential scanning calorimetry detected a weak glass transition for …