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Articles by Jae-Hak Choi
Total Records ( 2 ) for Jae-Hak Choi
  Joon-Yong Sohn , Jong Su Im , Sung-Jin Gwon , Jae-Hak Choi , Junhwa Shin and Young-Chang Nho
  In this study, polyethylene separators were modified by dip coating of polyethylene (PE) separators in poly(vinylidene fluoride-co-hexafluoropropylene)/poly(ethylene glycol) dimethacrylate (PVDF-HFP/PEGDMA) mixtures at different humidity levels (0–50%), followed by electron beam irradiation. Micro-porous structures of the coating layer were generated by performing dip-coating process at high humidity levels (i.e. phase inversion process) and were found to be affected by the PEGDMA content and humidity level. The thermal shrinkage of the prepared separators significantly decreased with increasing EB absorption dose due to the formation of crosslinked networks of the PVDF-HFP/PEGDMA-coated PE separators. It was also observed that the separators prepared under high humidity condition showed a higher liquid electrolyte uptake and the ionic conductivity than the original PE separators.
  Jae-Hak Choi , Chan-Hee Jung , Dong-Ki Kim , Dong-Hack Suh , Young-Chang Nho , Phil-Hyun Kang and Ramakrishnan Ganesan
  Multifunctional polyhedral oligomeric silsesquioxane (POSS)-reinforced polypropylene (PP) nanocomposites were prepared by a simple and economical radiation processing, which has a great potential for the preparation of high-performance materials. The tensile strength of PP/POSS nanocomposites increased with an increasing POSS content up to 5 wt% and with an increasing absorption dose up to 50 kGy. The tensile strength of irradiated PP/POSS nanocomposites decreased at high absorption dose due to the main chain scission of PP by radiation. The PP/POSS nanocomposites showed improved thermal stability due to the formation of crosslinked network between PP and POSS by radiation.
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