• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 학술대회 논문집 전문대학교육위원
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• pp.75-78
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• 2002

In this paper, we investigated the change of wettability, surface potential decay and surface resistivity caused by thermal-treated and plasma-treated FRP respectively for finding out the influence of electrical characteristics on the surface of polymer composites. For the change of wettability, the contact angle of thermal-treated specimen with the high temperature of 200$^{\circ}C$ increased. But that of plasma-treated specimen decreased. The characteristic of surface potential decay shows the tendency of the remarkable decrease on plasma-treated specimens, but no difference on thermal-treated specimen compared with untreated one. Also, for the surface resistivity, it shows the same trend compared with the change of contact angle. We can conclude that the degradation phenomena of epoxy surface are dominated by the induction of hydrophilicity and hydrophobicity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1587-1589
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• 2000

In this paper the weight loss, surface potential decay, surface resistivity and dielectric constant are measured to investigate the surface properties, insulation characteristic changes of PET film according to the discharge treatment. As a result of the test, up to the 10[min] the surface potential decay and surface resistivity have increased. Also, from the result of dielectric constant has decreased. On the other hand, the insulation characteristic of PET film have decreased after 10[min] in the discharge treatment.

• 한국전기전자재료학회논문지
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• 제13권5호
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• pp.411-419
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• 2000

In this paper we have investigated the surface degradation by ultraviolet-irradiation in high-temperature vulcanized silicone rubber. Through the measurement of surface potential decay by corona-charging and of contact angle it is found that the change of surface electrostatic properties and the decrease of contact angle under UV-radiation. For the changes in micro-morphological and chemical structure of the UV-treated silicone rubber we utilized several analytical techniques such as SEM, ATR-FTIR,XPS. From this study it is shown that the chemical reactions(scissoring of side chain(S-$CH_3$) cross-linking and branching) occur on the surface of silicone rubber during the UV-irradiation. Also we obtained the results of the loss of low molecular weight chain by cross-linking and oxidation reaction.

• 한국진공학회지
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• 제9권3호
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• pp.279-284
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• 2000

본 연구는 옥외용 epoxy/glass fiber의 열화과정을 분석하기 위하여 FRP 적층판을 고온과 수에 노출시켰다. 열화과정은 접촉각, 표면전위감쇠, 표면저항률의 비교에 의해 평가하였다. 젖음성의 변화는 열처리 시료에서 $200^{\circ}C$까지 접촉각이 증가하였지만 수분처리 시료는 감소하였다. 표면전위감쇠 특성은 수분처리 시료에서는 감소하지만, 열처리 시료는 미 처리와 비교해서 증가하였다. 또한, 표면저항률은 접촉각의 변화와 같은 경향을 보이고 있다.

• 한국안전학회지
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• 제13권3호
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• pp.88-95
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• 1998

In this paper, we investigated the change of wettability, surface potential decay and dielectric properties caused by ultraviolet-treated, thermal-treated and discharge-treated FRP(fiber reinforced plastics) respectively for finding out the influence of dry treatments effected to electrical characteristics on the surface of polymer composites. For the change of wettability, the contact angle of thermal-treated specimen with the high temperature of $200^{\circ}C$ increased. But that of UV-treated and discharge- treated specimen decreased. The characteristic of surface potential decay shows the tendency of the remarkable decrease on UV-treated and discharge-treated specimens, but no difference on thermal-treated specimen compared with untreated one. Also, for the dielectric properties, it shows the increase at large on the treated specimens and especially, the remarkable increase on thermal-treated one.

• 자원리싸이클링
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• 제18권4호
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• pp.44-51
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• 2009

양극과 철근과의 사이에 이온의 흐름이 원활하도록 전도성이 우수한 탄소리본전극과 표면코팅을 실기한 후 무공해, 반영구적인 무한태양전기를 전류로 공급한 전기방식에 의한 콘크리트 중의 철근 부식 방지 효과를 알아보기 위하여 복극량, 철근의 복극전위 및 부식속도를 측정하였다. 실험결과 방식을 실시한 모든 대상 시험체가 NACE의 복극량 기준 100 mV 기준을 만족하였으며, 방식을 실시한 경우 복극전위와 부식속도가 안정적인 범위에 있음을 알 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1682-1684
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• 2004

In this study, the surface properties of PET film were analyzed after plasma surface treatment. After plasma treatment of surface roughness and XPS were evaluated to analyze the chemical property, while the surface potential decay and surface resistivity was measured to analyze the electrical characteristic. When plasma discharge treatment was conducted for less than 10 minutes, the electrical insulating property was found to be improved through evaporation of low molecular weight materials and cleaning of surface. However, when the treatment was conducted for more than 10 minutes, the insulating property was decreased due to excessive discharge energy. Analysis of chemical characteristics showed that 10-minute treatment resulted in increase of C-O and O=C-O. However, when treated for more than 10 minutes, they were relatively decreased.

• 대한전자공학회논문지SD
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• 제41권12호
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• pp.1-6
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• 2004

본 연구는 PCB 기판용 FRP 재료의 열화현상을 규명하기 위하여 열 및 방전에 의한 열화를 각각 모의하여 표면에서의 화학적, 정전적 상관관계를 조사하였다. 열 처리에 따른 시료의 특성변화는 $200^{\circ}C$ 까지는 표면의 소수화로 인하여 접촉각 및 표면전위가 증가하였다. XPS에 의한 분석결과 열처리에 따라 표면측쇄상 산소기의 이탈과 탄소쇄의 불포화 이중결합의 증가로 처리시료에서는 소수성이 증가하였다. 또한 열처리로 인해 착색현상이 발생되었고, 이러한 현상은 ether기에 의해 발생된다는 것을 확인하였다. 방전 처리된 시료의 접촉각 및 표면전위는 표면에 카르복실기 라디칼을 포함하는 다량의 측쇄화가 집중적으로 발생되어 처리시간에 따라 급격한 친수화가 진행되었다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권5호
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• pp.373-378
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• 1999

In order to analyse the degradation mechanism of polymer materials for outdoor condition, FRP laminate was exposed to high temperature and ultraviolet rays. Then, thedegradation process was evaluated by comparing contact angle, surface potential decay, and polarity effect respectively. Especially, the analysis of surface degradation phenomena by corona charging method showed the exact correlation with the result of chemical properties. Therefore we can confirm that the application of corona charging method on the identification of degradation process is very useful. If this method is usedin degradation studies on the polymer surface, it will be more effective on the surface analysis of polymer insulators. With corona charging method and chemical spectrum analysis, it was possible concretely to define degradation process on the polymer surface exposed at the situation of different environmental conditions.

• 대한전기학회논문지
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• 제33권1호
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• pp.21-27
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• 1984

Both of the isother mally and thermally stimulated surface potential decay characteristics(SPDC) have been investigated not only in corona charged polysulfone(PSF) which is one of heat resistant polymer, but also in corona charged polyethyleneterephthalate(PET) and polyfluoroethylene propylene(Teflon FEP) under the same experimental condition. PSF and PET shows similar SPDC in the high teperature region. Also the effect of polarity on SPDC observed from PSF and Teflon FEP shows almost the same phenomenon. From these results, we suggest that the mechanism on SPDC of PSF could be explained as the bulk conductivity from the characteristic analysis concerning PET and electron affivity from characteristic analysis concerning Teflon FEP.