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李德出 단국대학교 1977 論文集 Vol.11 No.-
In high voltage insulation, the dielectric Breakdown of polymeric material is initiated of ten by the gaseous partial discharge at the surface or in the void. It is important from these view points to clearify the electric conduction of polymer not only on the MIM structure but also on the specimen on the naked surface of which gaseous ion are accumulated. The electric usually decreased with time a minute after The supply of ions. From the results of experiment, it is clear that the higher the potential difference and the higher the temperature, the electric current approached to the constant value within the shorter time. And electric charges accumulating on polyethylene surface diminish exponentially with time when the field is low. and the electric current is governed by the trap filled space charged limited current with the limited quantity of injected carriers.
진공증착중합법에 의해 제조된 PMDA / 4,4'-DDE 폴리이미드의 내열 특성
김형권,이은학,우호환,김종석,이덕출 (사단법인)韓國火災 ·消防學會 1996 한국화재소방학회논문지 Vol.10 No.3
The Polyimide thin films based on PMDA and 4,4'-DDE were fabricated by VDPM, and their heat resistance characteristics were invastigated by TGA(Thermogaravimetry Analyzer). It was found that deposition rate decreased with increasing substrate temperature and the thin films were not fabricated over the substrate temperature of 70℃. T_TG of 5% weight loss temperature is 565℃, 397℃ and 210℃ at the substrate temperature of 20℃, 40℃ and 70℃, respectively. It is realized that the endurace temperature for 20,000 hour of thin films fabricated at 20℃ and 40℃ is 230℃ and 200℃, respectively.