Seoul National University · 工学
Professor Jae Ryoun Youn's research lab specializes in the development and processing of advanced polymeric materials, with a focus on microcellular foams, polymer nanocomposites, and functional aerogels. The lab investigates the fundamental mechanisms of bubble nucleation and growth in polymer matrices, rheological behavior of nanocomposites, and structural stabilization of graphene-based aerogels for energy and environmental applications. Key research directions include enhancing mechanical properties, processability, and functional performance of lightweight, high-strength materials through innovative processing techniques and nanostructuring strategies.
Figures are computed from collected data and may differ slightly.
Abstract A new method of producing microcellular polyester composites is developed. The microcellular foam which is produced by supersaturating the polyester resin with nitrogen is cured by dielectric heating. The lightweight composite contains about 10 μm size bubbles. By substituting the microcells for the particulate fillers of the conventional composites, the weight of the composite is reduced by 30 to 40 percent. A theoretical analysis based on classical nucleation theory is applied to pred
Abstract Melt rheology and processability of exfoliated polypropylene (PP)/layered silicate nanocomposites were investigated. The nanocomposites were prepared by melt compounding process in the presence or absence of a PP‐based maleic anhydride compatibilizer. PP/layered silicate nanocomposites showed typical rheological properties of exfoliated nanocomposites such as nonterminal solid‐like plateau behavior at low frequency region in oscillatory shear flow, higher steady shear viscosity at low s
Abstract Processing of microcellular foam was studied for polyurethane. Assuming that the bubble growth is controlled by diffusion, theoretical prediction was carried out numerically to understand the bubble growth mechanism in the cavity during mold filling. Final bubble sizes were also predicted by considering the gelation time and the diffusion boundary. Viscosity change of the mixed polyurethane resin during polymerization reaction was predicted by considering reaction kinetics. The gelation
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