Research Interests

We are focusing on the generation of new polymer materials based on the development of polymerization reactions, which is consist of the following two undergoing projects:

1. Controlled Synthesis of Polyolefins Using Transition-metal Catalyst

Selective syntheses of polyolefins with various primary structure (Figure 1) will only be achieved by controlled polymerizations. Recently we found that fluorenylamidotitanium complex 1 is an effective catalyst for the living polymerization of propyrene, norbornene and other higher olefins (Figure 2). Catalyst 1 can also be applied for the syntheses of high molecular weight random/block copolymers of these olefins and comonomer content can be controlled.

Figure 1. Primary Structure of Olefin Copolymers
(Random, Block, Alternate, Graft Copolymers).
Figure 2. Polymerization of Norborene Using Titanium Catalyst 1.

2. Synthesis of New Biodegradeble Polymers Initiated by Metal Complexes

Biodegradeble polymers are used as medical devices such as surgical materials or supporting polymer of drug-delivery system. We are developing new biodegradeble materials with additional properties (i.e. high melting point, elasticity, or tensile strength) by copolymerization of lactide, other cyclic esters, and isocyanates.

Figure 3. SEM Images of Biodegradeble Polymer in Activated Sludge
(Left: before degradation, Right: after 14 days).