Yong Kiel Sung
Dongguk University
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Featured researches published by Yong Kiel Sung.
Materials Letters | 2004
Farid El-Tantawy; Yong Kiel Sung
Abstract In this paper, a new composite for ultrasonic attenuation backing has been successfully fabricated from porous epoxy resin containing titanium (Ti), silane coupling agent and plasticizer composites. The effect of Ti particles on the network structure and mechanical properties of epoxy resin has been analyzed in detail. The ultrasonic parameters in epoxy composites have been measured by a conventional pulse-echo-overlap technique at a frequency of 1–5 MHz. The effect of Ti content and temperature on the longitudinal sound velocity and attenuation of epoxy resin composites were investigated. Precise in situ observations of the acoustic properties such as attenuation and acoustic impedance of epoxy composites are expected to be useful for ultrasonic transducer systems for new as well as for backing application with high attenuation.
Macromolecular Research | 2002
Yong Kiel Sung; Farid El-Tantawy
The electrical conductivity during vulcanization process was measured as a function of time for the system of TiC loaded styrene-butadiene rubber (SBR) composites. The phenomenon of negative and positive temperature coefficients of conductivity and its conduction mechanism were also studied for the SBR polymeric composites. The current-voltage characteristics of the polymeric composites were non-linear in high voltage and showed a switching effect. The effects of temperature on the thermal conductivity and effective dielectric constant were measured. The measured parameters were found to be dependent on TiC concentration. The electromagnetic wave shielding (EMS) of the SBR-TiC polymeric composite was also examined. The SBR filled with TiC could be expected to be promising novel smart polymeric composites for self-electrical heating, temperature sensor, time delay switching, and electromagnetic wave shielding effectiveness.
Macromolecular Research | 2005
Farid El-Tantawy; Nadia Abdel Aal; Yong Kiel Sung
The network structure of Ni-coated carbon black (NCB) composites filled with phenolic resin was investigated by means of using scanning electron microscopy, viscosity, interfacial tension, shrinkability, Flory-Huggins interaction parameters, and swelling index. The electrical properties of the composites have been characterized by measurement of the specific conductivity as a function of temperature. Additionally, the variation of conductivity with temperature for the composites has been reported and analyzed in terms of the dilution volume fraction, relative volume expansion, and barrier heights energy. The thermal stability of phenolic-NCB composites has been also studied by means of the voltage cycle processes. The experimental data of EMI wave shielding were analyzed and compared with theoretical calculations. The mechanical properties such as tensile strength, tensile modulus, hardness and elongation at break (EB) of NCB-phenolic resin composites were also investigated.
Molecular Therapy | 2000
Sang Oh Han; Ram I. Mahato; Yong Kiel Sung; Sung Wan Kim
European Polymer Journal | 2004
Farid El-Tantawy; K.M. Abdel-Kader; F. Kaneko; Yong Kiel Sung
Journal of Applied Polymer Science | 1995
Dae Kyung Song; Yong Kiel Sung
Journal of Applied Polymer Science | 1994
Yong Joo Kim; Yong Kiel Sung; Ai Zhi Piao; David W. Grainger; Teruo Okano; Sung Wan Kim
Materials Letters | 2004
Farid El-Tantawy; N. Abdel Aal; A.A. El-Daly; A.M. Abdel-Daiem; A. Bakry; Yong Kiel Sung
Macromolecular Research | 2000
Yong Kiel Sung; Sung Wan Kim
Korea Polymer Journal | 1993
Yong Kiel Sung; Young Jin Kim; David W. Grainger; Teruo Okano; Sung Wan Kim