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Wear-resistant Flexible Polymer for Side-by-side Slot-die Coating
Yong-Cheol Jeong(정용철) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Flexible but still hard coating materials have been paid attention for applications in flexible electronic devices, as efforts to substitute glasses. However, there have been little approaches to find out control parameters determining their flexibility and hardness. Here, we present reaction-controlled ladder-like polymers with improved flexibility and hardness. In this study, the effects of various reaction conditions on the molecular weight of the polymer are investigated in terms of reaction time, and absence of byproducts, accompanying the analysis of mechanical properties of the corresponding films using nanoindentation. We also fabricated a rigid-soft-rigid (RSR) cover window of heterogeneous surface coating with a home-made slot-die coater. Finally, we demonstrate that the bending cycle reliability was also improved in terms of warpage with less irreversible deformation upon the folding test.
정용철(Jeong Yong-Cheol),배준현(Bae Jun-Hyun),이준석(Lee Jun-Seok),강영종(Kang Young-Jong) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
There are many railway structures which were designed without considering aseismic capacity. In special, masonry structures constructed long time ago should be reviewed about their resistance to earthquake. In this paper, technique to evaluate the capacity of masonry railway bridge is tried to develop by means of FEM analysis. In general FEM analysis program, 3-D solid element is used for masonry structures and response spectrum analysis procedure is tried. In addition, 3-D solid element has material properties equivalent to mortar-brick composite body. Used FEM program is ABAQUS-CAE.