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초음파 분산을 이용한 Epoxy-Organoclay 나노콤포지트 구조적 그리고 유전특성에 관한 연구
朴材俊(Jae-Jun Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.9
The effect of the organoclay_10A nanoparticles on the DSC and Structural and Dielectrics Propertiest(1㎐-1㎒) for epoxy/Organoclay_10A Nanocomposites has been studied. Dielectric properties of epoxy-Organoclay nanocomposites were investigated at 1, 3, 5, 7, 9 filler concentration by weight. Epoxy nanocomposites samples were prepared with good dispersion of layered silicate using power ultrasonic method in the particles. As structural analysis, the interlayer spacing have decreased with filled nanoparticles contents increase using power ultrasonic dispersion. The maximum increase interlayered spacing was observed to decease for above 5wt% clay loading. The other hand, as decrease with concentration filler of the layered silicate were increased dispersion degree of nanoparticles in the matrix. The interesting dielectric properties for epoxy based nanocomposites systems are attributed to the large volume fraction of interfacesin the bulk of the material and the ensuring interactions between the charged nanoparticle surface and the epoxy chains.
에폭시수지의 고전압 전원주파수 변화에 따른 장시간 전기적 트리잉 열화 특성연구
박재준(Park Jae-Jun) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
Electrical tree structure is one of the most important influencing factors for electrical treeing characteristics in polymers. In this paper, we focused on the structure characteristics of electrical treeing in epoxy resins (original) insulation under different high-frequency voltages (60, 500, 1000 ㎐). Effects of voltage frequency on the ac electrical treeing phenomena in an epoxy resins were carried out in needle-plate electrode arrangement. To measure the treeing initiation and propagation, and the breakdown rate, constant AC of 10 ㎸ with three different voltage frequencies (60, 500 and 1,000 ㎐) was applied to the specimen in needle-plate electrode specimen at 30 ℃ of insulating oil bath. At 60 ㎐, the treeing initiation time was 360 min and the propagation rate was 6.85×10-4㎜/min, and the morphology was dense branch type. As the voltage frequency increased, the treeing initiation time decreased and the propagation rate increased. At 1,000 ㎐, the treeing initiation time was 0 min and the propagation rate was 7.81×10-2㎜/min, and the morphology was dense bush type.
에폭시/마이크로/나노알루미나 콤포지트의 부분방전 저항성특성
박재준(Jae-Jun Park) 대한전기학회 2016 전기학회논문지 Vol.65 No.6
Neat Epoxy, nano alumina composites, micro alumina composites and multi-nano alumina composites were prepared and experiment were performed to measure their partial discharge resistant characteristics. The partial discharge resistance obtained for the microcomposites, nanocomposites and multi-nanocomposites are compared with those of unfilled epoxy and with GDE amount for surface modifier. It was observed that compare multi-nano alumina composites to micro alumina composites, the partial discharge resistance to degradation gets improved considerably. The improvement in the degradation resistance is attributed to the interface intension between the nano alumina composites and GDE , micro alumina and epoxy neat.
박재준(Jae-Jun Park),조대령(Dae-Ryung Cho),엄지용(Ji-Yong Um),윤여욱(Yo-Wook Yun),백관현(Kwan Hyun Baek) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
물리적 분산기법으로 초음파와 균질기를 동시에 적용한 분산기법을 이용하여 에폭시 기반 층상나노실리케이트를 충진한 에폭시나노콤포지트 제조하였다. 유리천이온도 특성으로 무충진 에폭시수지와 층상실리케이트가 충진된 나노콤포지트의 비교에서 9.2℃가 상승되는 결과를 얻었다. 고온부인 130℃ 환경온도에서 장시간 트리잉 절연파괴측정에서 무충진에폭시 수지에 비하여 나노콤포지트가 절연파괴시간이 13.39배 늦은 시간에 파괴되었고, 트리진전속도의 경우 나노콤포지트가 13.9배 늦은 지연속도를 나타내었다.
가속된 열적 스트레스에 의한 PAI / Nano Silica 하이브리드 코일의 절연수명 추정
박재준(Jae-Jun Park) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
In this paper, four types of insulation coils were fabricated by adding various kinds of glycols to improve the flexibility and adhesion of insulating coils in varnish dispersed with PAI / Nano Silica_15wt%. The applied voltage and frequency were 1.5 kV / 20 kHz for accelerated life evaluation. Through the 6th temperature stress level, the cause of the insulation breakdown of the coil was ignored and only the breakdown time was measured. The Arrhenius model was chosen based on the theoretical relationship between chemical reaction rate and temperature for estimating the insulation life of the coil due to accelerated thermal stress. Three types of distributions (Weibull, Lognormal, Exponential) were selected as the relationship between thermal stress model and distribution. The average insulation lifetime was estimated under the temperature stress of four types of insulation coils through the relationship between one kind of model and three kinds of distributions.
액상실리콘고무/나노 실리콘카바이드 복합체의 부분방전 저항성 특성
박재준(Jae-Jun Park) 대한전기학회 2021 전기학회논문지 Vol.70 No.4
For the development of HVDC cable connector, Nano SiC was corroded in H₂O₂ to form Si-OH . On the basis of SiR, Nano SiC was chemically treated with vinylsilazane. Samples were prepared by homogeneously dispersing the modified Nano SiC in silicon according to the doping level content (0, 1, 3, 5, 7, 9 wt%). It is to develop a controllable material with nonlinear conductivity that can homogenize electrical stress in HVDC cable connectors. In addition, in order to develop a material with strong partial discharge resistance and thermal conductivity, high voltage stress was applied for 500 hours in a 5kV/720Hz environment. As a result, the erosion depth of the surface was measured. Heat conduction was measured and evaluated to investigate the effect of high voltage stress on heat conduction.
저농도 알칼리-요소 전처리가 SwBKP의 고해특성에 미치는 영향
박재준(Jae-Jun Park),최경화(Kyoung-Hwa Choi),조병욱(Byoung-Uk Cho) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5
Effects of low concentration alkali-cosolvent swelling pre-treatment on beating characteristics of softwood bleached kraft pulp (SwBKP) fibers was investigated. Urea was applied as a cosolvent. When the pulp was swollen at a low concentration below 2% (based on the oven-dried pulp), the weight loss was below 1%. NaOH treatment below 2% concentration could improve the swelling of SwBKP. Addition of urea with NaOH solution promoted the swelling. In addition, low concentration NaOH-urea pre-treatment reduced the beating time to reach a certain level of beating degree. Lowest freeness level was obtained when SwBKP was treated with 1% NaOH while highest fibrillation level was obtained at 2% NaOH and 1% urea. It could be concluded that grinding efficiency could be improved by the low concentration alkali-cosolvent swelling while optimization for the pre-treatment is necessary.