EPDM 함량 변화에 따른 SBR/EPDM 블렌드 혼합물의 내오존성과 물리적 성질에 관한 연구

이종철 ( Jong Cheol Lee ),김태근 ( Tae Geun Kim ),황기섭 ( Ki Seob Hwang ),하기룡 ( Ki Ryong Ha ) 한국고무학회 2008 엘라스토머 및 콤포지트 Vol.43 No.1

Styrene-butadiene rubber(SBR)은 내마모성, 상용성, 방진성이 우수 하지만, SBR은 주쇄의 불포화기때문에 오존에 의해 쉽게 손상을 받고 탄화수소에 쉽게 팽윤되어 점탄성을 잃어버려 고무제품으로서의 수명을 단축시킨다. 따라서, 본 연구의 목적은 SBR 고무의 이러한 단점을 보완하기 위함이다. 내오존성과 기계적물성을 개선시키기 위해서 내오존성이 우수한 ethylene-propylene-diene terpolymer(EPDM)을 다양한 비율로 블렌드하고, 방진제품으로써의 적합성을 고려하기 위하여 다양한 분석기술을 사용하여 경도, 열분해 온도, 모폴러지, 유리전이온도, 내오존성, 정적 스프링정수를 측정하였다. 본 실험을 통하여 SBR과 EPDM 블렌드의 조성변화에 따른 특성을 연구한 결과, SBR에 대하여 EPDM 30% 블렌드시 상용성이 우수하고, 내오존성이 증가하는 것을 알 수 있었다. Styrene-butadiene rubber(SBR) has good abrasion resistance, miscibility, and anti-vibration property. however, it is easily damaged by ozone and swelled by hydrocarbon fluids because of unsaturation part in main chain, that causes loss of visco-elasticity and reduction of product`s life cycle. Therefore, object of this study is to cope with this problem. SBR is blended with various proportion of ethylene-propylene-diene terpolymer(EPDM), which has excellent ozone and oxygen resistance, to improve physical properties and ozone resistance, and diverse analytical techniques are used to measure morphology, glass transition temperature(Tg), ozone-resistance, degradation temperature, static spring constant, hardness for considering a suitability for anti-vibration industrial product. We found that the blend consisting of SBR 70% and EPDM 30% showed no crack after ozone test and good miscibility between SBR and EPDM from this study.

오존 산화가 DRAM 셀의 콘택 저항에 미치는 영향

최재승,이승욱,신봉조,박근형,이재봉 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.2

In this paper, the effects of the ozone oxidation of the landing polycrystalline silicon on the cell contact resistance of the DRAM device were studied. For this study, the ozone oxidation of the landing polycrystalline silicon layer was performed under various conditions, which was followed by the normal DRAM processes. Then, the cell contact resistance and $t_{WR}$ (write recovery time) of the devices were measured and analyzed. The experimental results showed that the cell contact resistance was more significantly increased for higher temperature of oxidation, longer time of oxidation, and higher concentration of ozone in the oxidation furnace. In addition, the TEM cross-sectional micrographs clearly showed that the oxide layer at the interface between the landing polycrystalline silicon layer and the plug polycrystalline silicon layer was increased by the ozone oxidation. Furthermore, the rate of the device failure due to too large write recovery time was also found to be well correlated with the increase of the cell contact resistance.

고도정수처리용 내오존 불소변성 우레탄 아크릴레이트 방수·방식재의 개발을 위한 기초적 연구

노상균(Noh Sang-Kyun),김성래(Kim Sung-Rea),신홍철(Shin Hong-Chol),김영근(Kim Young-Geun) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.8

In this study, as a basic study for developing water proof and anti-corrosive materials that can secure durability regarding ozone environment, summary of its result is as following. As the result of observation of surface before and after ozone treatment, in case of epoxy, urea, urethane and hybrid, which are existing waterproof and anti-corrosive materials, cracks by multiple gaps and splits on the surface were generated while in case of fluorine degeneration urethane acrylate, which is ozone-resistance, waterproof and anti-corrosive material, excellent result was appeared as the surface was relatively smooth. Reduction quantity of mass before and after ozone treatment was about 10% in case of epoxy, urea, urethane and hybrid, which are existing waterproof and anti-corrosive materials, as well as fluorine degeneration urethane acrylate, which is ozone-resistance, waterproof and anti-corrosive material. Therefore, it is believed that it can be utilized as excellent ozone-resistance, waterproof and anti-corrosive material in the future if its disadvantage is supplemented and corrected through additional researches on prevention of changes of color and for securing economic feasibility.

불소계 변성 폴리우레아의 합성 및 오존저항 특성

김성래 ( Sung Rae Kim ),박지용 ( Ji Yong Park ),이종대 ( Jong Dae Lee ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2

본 연구에서는 내 오존성을 향상시키기 위해 PFPE-diol을 도입하여 불소계 변성 폴리우레아를 합성하였다. 불소 함량에 따라 변성 폴리 우레아(PFDIA-10C, PFDIA-20C, PFDIA-30C)를 제조하였으며 각각의 폴리우레아는 불소를 10wt%~30wt% 포함하였다. 제조된 도막의 오존처리 전 후 질량변화를 조사하였고, 도막의 경도, 내마모성, 인장성능 그리고 신장율 등의 물성을 분석하였다. 또한 내 오존성 테스트(10ppm, 336h)후에 광학현미경을 통해 도막표면을 관찰한 결과 PFPE-diol의 함량이 20wt% 이상 일 때 균열, 탈색 그리고 질량감소량에서 양호한 결과를 보여주어 도막의 내 오존성이 향상되었음을 알 수 있었다. FT-IR 분석을 통해 PFDIA 합성물의 O-H 피크가 불소 함량 증가함에 따라 감소하는 것을 확인하였다. The fluorine-containing modified polyurea was synthesized using the PTPE-diol to improve the ozoneresistance. Three types (PFDIA-10C, PFDIA-20C, PFDIA-30C) of the modified polyurea containing the fluorine content from 10wt% to 30wt% were prepared. After ozone treatment on the prepared films, the weight loss of film was investigated and analyzed the film properties such as hardness, wear resistance, tensile stress, elongation, etc. Also, the film surfaces were observed by the optical microscopy after ozone-resistance tests at 10ppm for 336h. It was shown that the defects such as the cracking, the bleaching and the mass loss were reduced and the ozone-resistance of films were improved when the contents of PFPE-diol are more than 20wt%. It was found that the intensity of O-H peak in PFDIA compounds confirmed by FT-IR was decreased as fluorine contents were increasing.

고분자재의 물성에 미치는 환경인자의 영향 : 오일 및 오존반응시간 Oil and Ozone Reaction Time

박찬영 한국환경과학회 2000 한국환경과학회지 Vol.9 No.6

The purpose of this experiment is to prepare ethylene propylene diene terpolymer(EPDM)/acrylonitrile butadiene rubber(NBR) blend which represents good environmental resistant properties including favorable oil and ozone resistance. With incorporation of EPDM, NBR and other ingredients, the rubber and chemical additives were mixed by mechanical method such as Banbury mixer and open 2-roll mill. Then rubber vulcanizates were manufactured by hot press and mechanical properties, oil and ozone resistance of the test specimens were measured. The oil resistance and ozone resistance of EPDM and NBR, respectively, is remarkably improved by blending EPDM with NBR. The optimum results of oil and ozone resistant characteristics were obtained at EPDM/NBR(=25/75 wt%) composition ratio.

공기역학적 저항 모수화에 따른 오존의 건성침적속도 비교

이화운,문난경,노순아 한국환경과학회 2002 한국환경과학회지 Vol.11 No.7

The aerodynamic resistance(R_a) to vertical transfer in the surface boundary layer can be formulated in terms of the friction velocity, height of observation, vertical heat flux and surface roughness. Unlike previous studies which focused on the role of R_c, present study perform additional tests using a variety of R_a, formulae. Several R_a formulations available in the literature, suitable for unstable conditions, were tested for their influence on the dry deposition velocity. The canopy resistance(R_c) determines the shape of the diurnal pattern, while a small amplitude diurnal cycle in V_d was attributed to the aerodynamic resistance. The aerodynamic resistance is the major contributor to the formation of spikes in nighttime and R_a is relatively important at night because the canopy resistance is smaller. All formulations show similar diurnal cycle and yield good agreement with the observations. Although present V_d formulations are suitable for numerical air quality models, the research must continue for further improvements in resistance parametrizations.

Degradation of chlorotetracycline and bacterial disinfection in livestock wastewater by ozone-based advanced oxidation

Hyejung Lee,이기세,Eunyoung Lee,이창희 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3

The simultaneous removal of antibiotics and antibiotic-resistant bacteria by ozone-based advanced oxidation technology (AOT) was investigated for the treatment of anaerobic digestion effluent of piggery wastewater. Chlorotetracycline (CTC) and CTC-resistant bacteria were selected as targets since CTC has been the most used antibiotics in livestock industries in Korea. The performance of four different combinations of oxidation agents was investigated, showing the order of removal rate as O3 < O3/H2O2 < O3/UV < O3/UV/H2O2 for wastewater. Applications of O3/UV/H2O2 and O3/UV degraded almost all CTC within 15 and 20 min, respectively. Only 30% of CTC was degraded even in 40 min by O3 alone and O3/H2O2 degraded 65% of CTC in 40 min. The combination of ozone/H2O2 did not contribute significantly to CTC degradation, but the influence of UV was substantial when coupled with ozone. CTC was partially degraded during oxidation although main HPLC peak was completely vanished. The resulting intermediates of partially oxidized CTC possessed no more antibiotic capability, suggesting that CTC transformed into nontoxic organic constituents. For disinfection, ozone alone was not effective for disinfection; less than 2-log reduction was achieved in 1 h. UV was more superior in reducing bacterial population, showing more than 4-log reduction in 20 min and 5-log reduction in 40 min. UV was also effective in reducing both total and CTC-resistant bacterial population, and the contribution ratio of UV to ozone was about 3:1 in logarithmic scale. The application of O3/UV together further enhanced the disinfection performance compared to UV alone.

Degradation of chlorotetracycline and bacterial disinfection in livestock wastewater by ozone-based advanced oxidation

Lee, H.,Lee, E.,Lee, C.H.,Lee, K. Korean Society of Industrial and Engineering Chemi 2011 Journal of industrial and engineering chemistry Vol.17 No.3

The simultaneous removal of antibiotics and antibiotic-resistant bacteria by ozone-based advanced oxidation technology (AOT) was investigated for the treatment of anaerobic digestion effluent of piggery wastewater. Chlorotetracycline (CTC) and CTC-resistant bacteria were selected as targets since CTC has been the most used antibiotics in livestock industries in Korea. The performance of four different combinations of oxidation agents was investigated, showing the order of removal rate as O<SUB>3</SUB><O<SUB>3</SUB>/H<SUB>2</SUB>O<SUB>2</SUB><O<SUB>3</SUB>/UV<O<SUB>3</SUB>/UV/H<SUB>2</SUB>O<SUB>2</SUB> for wastewater. Applications of O<SUB>3</SUB>/UV/H<SUB>2</SUB>O<SUB>2</SUB> and O<SUB>3</SUB>/UV degraded almost all CTC within 15 and 20min, respectively. Only 30% of CTC was degraded even in 40min by O<SUB>3</SUB> alone and O<SUB>3</SUB>/H<SUB>2</SUB>O<SUB>2</SUB> degraded 65% of CTC in 40min. The combination of ozone/H<SUB>2</SUB>O<SUB>2</SUB> did not contribute significantly to CTC degradation, but the influence of UV was substantial when coupled with ozone. CTC was partially degraded during oxidation although main HPLC peak was completely vanished. The resulting intermediates of partially oxidized CTC possessed no more antibiotic capability, suggesting that CTC transformed into nontoxic organic constituents. For disinfection, ozone alone was not effective for disinfection; less than 2-log reduction was achieved in 1h. UV was more superior in reducing bacterial population, showing more than 4-log reduction in 20min and 5-log reduction in 40min. UV was also effective in reducing both total and CTC-resistant bacterial population, and the contribution ratio of UV to ozone was about 3:1 in logarithmic scale. The application of O<SUB>3</SUB>/UV together further enhanced the disinfection performance compared to UV alone.

Ozone-Crack Resistance of Rubber Composite at Static and Dynamic Condition

장동호,이현화,손봉영,조성효 한국고분자학회 2004 한국고분자학회 학술대회 연구논문 초록집 Vol.29 No.2

고도정수처리용 콘크리트 금속용사 피막의 내오존성 및 오존처리 후 부착강도 평가에 관한 실험적 연구

박진호,장현오,이한승 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 논문집 Vol.22 No.4

The introduction of advanced water treatment facilities has increased as the conventional purification method cannot remove the substance clearly. However, the internal waterproofing and Anticorrosion materials of the advanced water treatment facility using ozone deteriorate due to the oxidation power of ozone and affects the concrete, which causes a decrease in durability. This study is to evaluate the ozone resistance according to the type of spray metal and the surface treatment method of the coating, and the bond strength after ozone treatment in order to develope a finishing method to prevent deterioration of concrete structure of water treatment facility using metal spraying method as a way to construct metal panel with excellent ozone resistance and chemical resistance by an easier way than the previous. The Experimental results show that spray metal Ti has superior ozone resistance even after spraying. It is considered to be the most suitable method for ozone resistance and bond performance by finishing using Teflon sealing as surface treatment method. 기존의 정수처리 방법으로는 제거되지 않는 물질이 발생함에 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 오존을 이용한 고도정수처리 시설의 내부 방수·방식재는 오존의 산화력에 의해 열화되며 콘크리트까지 영향을 미쳐 내구성 저하의 원인이 된다. 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 및 피막의 표면처리 방법에 따른 내오존성 평가를 실시하였으며, 오존처리 후의 부착강도를 평가하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타났으며 표면처리 방법으로는 테프론계 봉공처리제를 사용하여 마감하는 것이 내오존성 및 부착성능 확보에 가장 적합한 방법이라 판단된다.