Study for Lubricating Properties of Norbornene-Based Bottle-Brush Polymers Synthesized by ROMP and RAFT
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Bottle-brush polymers are widely used for the studies of hydration lubrication due to their unique mechanical and rheological properties. By mimicking lubricin we synthesized bottle-brush polymers using two polymerization methods: ring opening metathesis polymerization (ROMP) and reversible addition fragmentation chain transfer (RAFT) polymerization. To do so, norbornene and chain transfer agent (CTA) containing monomers (cationic, anionic, or zwitterionic) were used for ROMP and RAFT, respectively. The reactions were carried out by tuning Grubb’s catalyst generation, the concentration of Grubb’s catalyst, the amount of initiator, and solvents. The molecular weight of the synthesized polymer was measured by a GPC and calculated percent conversion using NMR. The lubricating properties of the synthesized brush polymers affected by bottle-brush architecture and hydrate state were examined by a ball on disk.