Papers by Author: Sun Wha Oh

Paper TitlePage

Authors: Hyo Sim Kang, Sun Wha Oh, Young Soo Kang
Abstract: We prepared various pyrazoline derivatives which possess dimethylamino-, ethoxy-, isopropyl-phenyl ring at the 5-position of pyrazoline. The nanoparticles of pyrazoline derivative ranging from tens to hundreds of nanometers by the reprecipitation method have been successfully prepared and their optical size-dependent properties have been investigated with UV-vis, fluorescence spectroscopy, DLS (Dynamic Light Scattering) and SEM. The size-dependent optical properties of pyrazoline organic nanoparticles have been observed in the order of dimethylamino- > ethoxy- > isopropyl- in electro-donating characters.
Authors: Song Lee, Byung Hyun Ahn, Sun Wha Oh, Young Soo Kang
Abstract: In this work, low density polyethylene (LDPE) was grafted with trifluoroacetic acid allyl ester using γ-ray irradiation from a Cobalt-60 source at different adsorbed doses. It was found that the grafting degree increases with the absorbed doses. The highest grafting degree was obtained at 100 kGy of absorbed dose and with 30 wt% of trifluoroacetic acid allyl ester. The grafting was identified with fourier transform infrared (FT-IR) using a calibration curve reported in literature. Thermal properties of the functional polymers were studied by thermogravimetric analysis (TGA) and the surface morphology was investigated by scanning electron microscope (SEM).
Showing 1 to 2 of 2 Paper Titles