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Pusan National University, Republic of Korea
Biodegaradable nanoporous microspheres by RAFT polymerization
Triblock copolymers based on polycaprolactone (PCL) and photodegradable poly(methyl vinyl ketone) (PMVK) were synthesized and characterized. First, PCL based triblock copolymer was synthesized by RAFT polymerization followed by the fabrication of microsphere by emulsion method.Nanoporous microspheres based on PMVK-b-PCL-b-PMVK block copolymers were fabricated by photodegradating PMVK blocks by UV irradiation and evaluated their surfaces and internal structures by electron microscopies.Fabricated microspheres had uniform size particles with approximately 5 um in diameter, and those from block copolymers had a nanoporous structures after UV exposure, while PCL microspheres had kept smooth surfaces. Spherical microspheres were gradually changed to disk-shaped forms as UV irradiation time increased, owing to collapsing of PMVK blocks by UV irradiation.
Dr. Ildoo Chung is currently the professor and department head of Department of Polymer Science and Engineering at Pusan National University, Korea. After he received his Ph. D. degree at Pusan National University in 2000, he completed his postdoctoral training in Department of Chemistry at University of Tennessee, and in Department of Biomedical Engineering at University of Alabama at Birmingham, USA. He is now serving editor-in-chief of Journal of Adhesion and Interface, and member of board of directors in the Polymer Society of Korea, the Korea Society of Adhesion and Interface, Korea Polyurethane Society, and Asian Cyclodextrin Conference. From 2012 to 2013, he was in Department of Chemistry at University of Tennessee as a visiting associate professor. He had over 70 peer-reviewed publications and over 230 presentations in national and international conferences. His research interests are focused on advanced polymeric biomaterials such as drug delivery system, hard/soft tissue compatible polymers, photocurable 3D printing polymer, biodegradable polymer and composite system.
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