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NBR / Polypyrrole 전도성 복합체의 제조와 전기적 성질
이완진,정미옥 한국공업화학회 2000 응용화학 Vol.4 No.1
The conducting composites were prepared by emulsion polymerization with poly(acrylonitrile-co-butadiene)(NBR) as a matrix and polypyrrole(PPY) as a conducting polymer. The film of composite was prepared by compression molding. The electrical conductivity was measured by 4 probes method with the amount of PPY and temperature. When the content of PPY was 25 wt%, the electrical conductivity of composite was increased up to 1.17 S/㎝. The percolation threshold showed in the vicinity of 15 wt% PPY content.
폴리에틸렌 / 육티탄산칼륨 휘스커 복합재료에 의한 축전지격리막의 제조에 관한 연구
이완진,고만석,최병렬,조일훈 ( Wan Jin Lee,Man Seok Ko,Byung Ryul Choi,Il Hoon Cho ) 한국공업화학회 1998 공업화학 Vol.9 No.2
초고분자량폴리에틸렌(UHMWPE), 고밀도폴리에틸렌(HDPE), process oil(mineral oil) 및 육티탄산칼륨 섬유로 구성되는 입자혼합물을 150℃에서 30분 동안 용융 혼합하고, 동일온도 및 5000 psi의 조건으로 압축성형을 하여 200㎛ 두께의 격리막 시험편을 제조한 후, process oil을 유기용매로 추출하여 PE층 사이에 미세공을 형성시켰다. 본 실험에서 시험편은 고분자와 process oil의 비율(PR)이 0.1 이하에서는 고무상이 되고 0.5 이상에서는 gel상으로 변하기 때문에, PR의 범위를 0.1-0.5 사이로 하였다. 시험편은 비극성 유기용매로 추출한 경우거의 98%의 process oil이 추출되었으며, PR이 증가함에 따라 무게감소율은 감소하였다. 인장강도는 PR이 0.426인 경우 31kg/㎠을 보였으며, 전해전기저항 값은 PR이 0.186 및 0.426에서 37 mΩ/㎠과 53 mΩ/㎠ 이었다. 질소 흡-탈착법에 의한 등온선은 모세관 응축영역을 나타내는 hysteresis를 가졌으며, PR=0.186인 경우 130 ㎡/g의 비교적 큰 표면적을 나타내었다. 이는 SEM의 분석 결과와 마찬가지로 PE배향층 사이에 육티탄산칼륨 섬유가 무작위로 잘 분산되었음을 보여주는 결과이며, host인 PE층 사이에 guest인 육티탄산칼륨 섬유가 층간되어 층상공을 형성한다고 추론할 수 있다. The mixtures of ultra-high molecular weight polyethylene (UHMWPE), high density polyethylene (HDPE), process oil (mineral oil) and potassium hexatitanate whisker were melted and mixed at 150℃ for 30 min, and prepared by compression molding to the specimen of separator of about 200㎛ thickness at the same temperature and 5000 psi. Thereafter the pores were formed by extracting process oil with organic solvents. In this study, the range of PR (the ratio polymer to process oil) was varied from 0.1 to 0.5 because the specimen turned into rubbery phase at which PR was below 0.1 whereas it changed into gel phase at which PR was above 0.5. When the specimen was treated with nonpolar organic solvents, process oil was extracted nearly 98%. Tensile strengh was 31 kg/㎠ at PR = 0.426, and resistance of specimen was 37 mΩ/㎠ at PR = 0.186, and 53 mΩ/㎠ at PR = 0.426. The N₂adsorption-desorption isotherm showed a hysteresis representing regions of capillary condensation, and the surface area at PR = 0.186 was relatively large as 130 ㎠/g. Potassium hexatitanate whisker was randomly dispersed in between PE layers. It might be that the whisker is intercalated through the PE thin layers oriented by compression.
이완진,고만석 한국공업화학회 1999 응용화학 Vol.3 No.1
In this study, the concentration of ozone measured at ozone generator was 0.5ppm, 1.2ppm, 2.7ppm. The phenol solutions of 5ppm were treated by above ozone concentration at 5min, 10min, 15min, 20min, 30min, Ihr and the phenol solution treated by ozone was measured by UV-visible spectrophotometer. The removal rate of phenol showed the maximum value of 98.6% in ozone concentration of 2.7ppm and ozone contact time of 1hr. This mean that removal rate of phenol increases with increase of ozone concentration and ozone contact time.
폴리아세탈 / 육티탄산 칼륨 휘스커 복합재료의 제조 및 기계적 성질에 관한 연구
이완진,고만석 한국공업화학회 1998 응용화학 Vol.2 No.1
The silane coupling agents, γ-amino-propyltriethoxy silane, were used to improve interfacial bonding between polymer and whisker in preparing for the composite. Potassium hexatitanate whisker which the surface was treated by the contents of silane coupling agent and polyacetal were melted and mixed for 30 min at 165℃, and the specimen was synthesized by injection molding. The composite which is blended with whisker of 30 wt% treated by silane coupling agent of 0.6 wt% was the maximum in mechanical properties. This means that the functional groups of silane coupling agent were enhanced wettability between polyacetal and whisker.