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김기엽 한국전기전자재료학회 1992 電氣電子材料學會誌 Vol.5 No.2
무독성 혼합안정제인 Zn/Ca-stearate의 방사선 안정화 효과를 증진시키기 위해서 안정화 조제로 알코올들을 PVC에 배합하여 방사선 조사하였을 때 PVC의 색차변화를 측정하여 이들 안정화 조제의 방사선 안정화 효과를 비교 검토하였다. 2가알코올에 의한 PVC 안정화 효과는 2가알코올의 주쇄길이에 비례하여 나타나고 있으나 sorbitol을 제외한 다가알코올에 의한 PVC 안정화 효과는 거의 없는 것으로 나타났다. 이들 알코올에 의한 PVC의 방사선 안정화는 2가알코올이 PVC에서 발생된 고분자 라디칼에 대한 라디칼 포착제로서 작용하기 때문인 것으로 판단된다.
『동유학안東儒學案』을 통해 본 조선 유학사 서술의 두 가지 양상: 1940년대 편찬된 『동유학안』 2종을 중심으로
김기엽 (재)한국연구원 2023 한국연구 Vol.- No.13
The Dongyuhakan(『東儒學案』) is one of the Hakan(學案) that covers Confucian scholars and their theories since Th ree Kingdoms Period. Th ere are two version of it, compiled during the Japanese colonial era, one by Ha Kyeomjin(河謙鎭) and the other by Kwon Ohwan(權五煥). The two Dongyuhakans show signifi cant diff erence in their composition and narrative styles. The Dongyuhakans compiled by Ha and Kwon relatively focused more on the description of Yeongnam School than Giho School, since the compilers both had ties with Yeongnam School. Ha, however, categorized the works based on the schools, sorted the works that express the theories and academic characteristics, and briefl y described the origins of each school in the introduction part of each Hakan. In contrary, Kwon categorized the works based on family name of the clans and organized nationwide scholars. In Dongyuhakan Volume 1, Kwon extracted and compiled the assessment of scholars and their quotations from various historical records. Other volumes, however, list the scholars representing each clan and their descendants. Th ese volumes also showed a characteristic as a roster by briefl y describing the name, pen name, career, kinship, etc, under the names of each clan’s scholars in the columnella. Th is study holds signifi cance in newly discovering and introducing Dongyuhakan of Kwon, which has not been studied before, and compared and contrasted the narrative styles of two Dongyuhakans to fi gure out the two formative narrative styles of the Joseon Confucianism during the Japanese colonial era.
방사선가교에 의한 열수축성 PVC 튜브의 제조에 관한 연구
김기엽 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.4
열수축성 튜브 제조에 적합한 조성을 얻기 위하여 PVC의 방사선가교에 대하여 검토하였다. 중합도가 각각 다른 PVC에 가소제, 가교제를 변화시켜 배합한 혼합물을 방사선 가교시켰을 때 가교도는 가교제, 가소제, 중합도 및 조사선량이 증가됨에 따라 증가되었다. 가교제로서는 삼관능성 단량체가 높은 가교효율을 나타내었다. 가교 PVC 필름의 열수축성은 연신배율과 수축 온도를 높여줌으로써 증가되었으나 가교제 및 가소제의 증가량에 의한 열수축성의 증가는 나타내지 않았고 저중합도 PVC의 열수축성은 극히 저조하였다.
^(60)Co γ-선 조사에 따른 클로로프렌 고무의 열적 특성
김기엽,이청,류부형 한국안전학회 2003 한국안전학회지 Vol.18 No.4
The thermal properties of chloroprene rubber (CR) with ^(60)Co γ-ray irradiation has been investigated. The prepared CR was irradiated up to 1000kGy radiation dose by Co^(60) γ-ray and the radiation degradation of CR was investigated by thermogravimetric analysis and differential scanning calorimetry. Dynamic mechanical properties measurement and FT-1R observation are carried out as well. From these analyses results, the glass transition temperature(T_(g)), decomposition onset temperature(DOT), oxidative induction time(OIT), the peak temperature of loss modulus and mechanical tan δ values were compared for the radiation degradation level of CR. The tendency between T_(g) and peak temperature of loss modulus and mechanical tan a agreed well with radiation doses. Decomposition temperature, OIT and DOT showed the same tendencies as increasing radiation doses. It was verified that these analyses are available to estimate the degradation level of CR
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.