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김기엽,류부형,강성화,이청,임기조,Kim, Ki-Yup,Ryu, Boo-Hyung,Kang, Seong-Hwa,Lee, Chung,Lim, Kee-Joe 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.11
Radiation effects on dielectric properties of low density polyethylene(LDPE) were investigated using the various measurements of FT-IR, gel content and elongation at break. FT-IR spectra showed that polar groups were comprised in LDPE due to radiation treatment. It was also confirmed that the formation of polar groups on LDPE caused the increased dielectric properties such as permittivity and tan $\delta$. However, in this study, any evidence of decreasing permittivity was not found although the morphological change of LDPE could be identified from the increasing gel content and the decreasing elongation.
열화에 따른 Polyetheretherketone의 유전완화특성
김기엽,이청,류부형,임기조,Kim, Ki-Yup,Lee, Chung,Ryu, Boo-Hyung,Lim, Kee-Joe 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.4
The dielectric properties of Y-ray irradiated and thermally aged polyetheretherketone (PEEK) have been investigated. Results of the temperature dependency of dielectric properties indicated that the glass transition temperature of aged PEEK increased as radiative and thermal ageing. The frequency dependency of dielectric properties implied that the magnitude of radiation and thermal induced dipoles, ions increased as radiative and thermal ageing. The values of relaxation intensity calculated using Cole-Cole's circular arc can be useful for evaluation of degradation level of PEEK.
Poly ( vinyl sulfone ) - Li 계 고분자 전해질의 전기적 특성
박수길,박종은,이홍기,손원근,임기조,이주성 ( Soo Gil Park,Jong Eun Park,Hong Ki Lee,Won Gun Son,Chang Jin Lee,Kee Joe Lim,Ju Sung Lee ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Polymer solid electrolytes have been interested in polymer secondary battery system because of it`s many advantages such as energy density, light weight, wide range of operation temperature, low cost and easy handling. In this study we used polyvinylsulfate, LiClO₄, and LiPF_6 to apply polymer lithium battery. The crystallinity of PVS decreased with the addition of lithium salts and plasticizer, especially LiClO₄ and PC showed more effectiye than LiPF_6 and EC. TGA of polymer electrolyte increased with lithuim salt concentration whereas melting temperature(Tm) decreased less than 46℃.