Chang Y. Ryu

Professor, Director of NY State Center for Polymer Synthesis, Chemistry and Chemical Biology

Career Highlights: Upon earning his Ph.D. with Tim Lodge at the University of Minnesota in 1998 , Dr. Ryu served as a postdoctoral researcher with Ed Kramer and Glenn Fredrickson at the University of California , Santa Barbara for two years. He joined Rensselaer in November, 2000 as an Assistant Professor of chemistry,and was promoted to an Associate Professor with tenure in 2006 and a Professor in 2013. He has won the NSF CAREER Award (2005), Mettler-Toledo Thermal Analysis Education Grant (2001), the Arthur K. Doolittle Award from the American Chemical Society Division of Polymeric Materials Science and Engineering (1998), and Korea Foundation for Advanced Studies Scholarship (1993 – 1998).

Research Areas: Macromolecular Separation and Adsorption: Our group is studying macromolecular separation and adsorption using high performance liquid chromatography (HPLC). We study polymer separation by HPLC and explore its unique applications for rigorous analysis and purification of polymers, block copolymers and functional oligomers. We also pursue a molecular level understanding of polymer/copolymer adsorption in confined geometries in order to gain insights on macromolecular interactions during HPLC. We are mainly interested in separating (co)polymers and oligomers that are synthetically very challenging to obtain as pure samples and/or can have technological implications in nanoscale self-assembly, electro-optical applications, and carbon nanotube fabrication. Block Copolymer Self-Assembly in Solution and Thin Films: We are interested in developing a polymer research program in structure-property relationships of multiphase polymer systems, where their performance and applications are closely related to the mesoscopic morphologies. The central theme of my research effort will be the design, synthesis, and characterization of model polymers and the study of their structure-property relationships as in bulk and thin films. We will combine the polymer separation technique using HPLC to obtain pure block copolymers and study their self-assembly in solution and thin films. The ultimate aim will be to guide the rational design of polymeric materials, thus gaining a fundamental understanding in the correlation between properties and structures in multiphase polymers. Sustainable Polymer Materials: One of the major challenges in macromolecular chemistry of this century will be to develop practical and scalable approaches to the replacement of petroleum-derived monomers and polymers with sustainable offset materials from biomass. Vegetable oils, triglyceride esters, can be chemically converted to epoxy thermoset monomers by oxidizing the unsaturated double bonds into epoxy groups. We have prepared epoxidized vegetable oils (EVOs) by a "green" oxidation method using H2O2 and W-based interfacial catalyst to introduce epoxy groups to vegetable oils, and used these EVO monomers for preparing epoxy thermosets via the photo and thermal cationic polymerization. 

Education

Education: Ph.D., Chemical Engineering, University of Minnesota, 1998 B.S., M.S., Chemical Technology, Seoul National University, 1990, 1992

Research Focus
  • Sustainable Polymer Materials
  • Block Copolymer Self-assembly
  • Structure-property-relationships of polymeric materials
  • Polymer HPLC and Large Scale Purification
  • Viscoelasticity, polymer thermal characterization
  • Electron Microscopy & Surface analysis/modification
Select Works
  • H. J. Park, G. M. Treich, Z. D. Helming, J. E. Morgan, C. Y. Ryu, H. S. Hwang, G. Y. Jung, “Micellar packing of Pluronic block copolymer solutions: polymeric impurity effects” Macromol. Res. 2015, 23, 13-20.
  • A. D. Mohanty, C. Y. Ryu, Y. S. Kim, C. Bae, “Stable elastomeric anionic exchange membranes based on quaternary ammonium-tethered polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene triblock copolymers” Macromolecules 2015, 48, 7085-7095.
  • Y. Chang, A. D. Mohanty, S. B. Smedley, K. Abu-Hakmeh, Y. H. Lee, J. E. Morgan, M. A. Hickner, S. S. Jang, C. Y. Ryu, C. Bae, “Effect of superacidic side chain structures on high conductivity aromatic polymer fuel cell membranes” Macromolecules 2015, 48, 7117-7126.
  • S. Y. Park, J. Chun, J. Y. Jeon, P. C. Lee, Y. Hwang, B. G. Song, R. Ramos, C. Y. Ryu, B. Y. Lee, “Branched poly(1,4-butylene carbonate-co-terephthalate)s: LDPE-like semicrystalline thermoplastics” J. Polym. Sci.: Polym. Chem. Ed. 2015, 53, 914-923.
  • Hee Sung Hwang, Gi Won Shin, Aaron Cohen, Chang Y. Ryu and Gyoo Y. Jung* “Sieving Properties of End Group-Halogenated Pluronic Polymer Matrix in DNA Separation Under Nondenaturing CE Analysis” Electrophoresis 35(20), 2946-2950 (2014)
  • Matthew T. Ravalli and Chang Y. Ryu* “Viscoelastic Relaxation of Block Copolymers” Encyclopedia of Polymeric Nanomaterials (Springer Berlin Heidelberg) DOI 10.1007/978-3-642-36199-9_82-1, pp 1-4 (2014)
  • H. J. Park, C. Y. Ryu, J. V. Crivello*,”Photoinitiated Cationic Polymerization of Limonene 1,2-Oxide and -Pinene Oxide” J. Polym Sci.: Polym. Chem. Ed. 2013, 51,109-117.
  • H. J. Park and C. Y. Ryu*, “Scalable PEO-PPO-PEO Triblock Copolymer Purification From Pluronics Through Competitive Adsorption” Polymer 2012, 53, 5052-5059.