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에탄올 (혹은 알콜) 가스 농도를 측정하기 위해 다공질 실리콘 층을 이용한 멤브레인 알콜 센서를 제조하였다. 에탄올은 실리콘 웨이퍼에 대해 침투성이 강하여 수용액 내에서 실리콘 웨이퍼를 가공할 때 반응을 촉진시키는 물질로서 자주 사용된다. 본 연구에서는 25%의 불화수소용액에서 만든 다공질 실리콘 층을 알코올 감지막으로 한 알코올센서를 제작하여 0%에서 0.5%의 알코올 농도범위에 대해 감지 특성을 측정하였다. 그 결과, 알코올 농도가 증가할 때 다공질 실리콘 층의 전기 전도가 증가하게 되어 측정된 전기저항은 알콜농도에 반비례하는 관계가 관측되었다. 응답 특성은 상용화가 가능할 정도로 양호한 응답속도 및 선형성을 보였다. Porous silicon gas sensors with membrane structure are fabricated to measure vaporous ethanol (called alcohol) concentration. Since ethanol is very strongly permeable into the silicon wafer, it is often used to aid chemical reaction when the silicon wafer is reacted under some aqueous solution. In this work, sensing properties were measured for the alcohol concentration from zero to 0.5 percent with the porous silicon layer formed in 25% HF solution. As the result, the measured resistance was observed to be inversely related to alcohol concentration due to the increase of the electrical conductivity by adsorption into porous silicon surface. The sensors showed good response time and linearity which they can be probably commercialized.
Polymer nanocomposites represent a rational alternative to conventionally filled polymers. Because of their nano-scale dispersion, nanocomposites exhibit markedly improved properties when compared with the pure polymers or conventional composites. The performance of unsaturated polyester resin (UP) has relatively poor mechanical properties, thermal stability, and flame retardant properties. The unsaturated polyester nanocomposites with difference amount (wt%=5,10,15) of fillers (MWCNTs, Si-aerogel, Carbon Black, MMT, Modified organic nanoclay) were prepared by resin transfer molding(RTM) method. The thermal properties of nanocomposites were analyzed using TGA and flame retardancy. As a result, modified organic nanoclay loaded UP showed decomposition temperature was dramatically increased compere to other fillers used.
Ethylene-propylene-diene-monomer (EPDM) rubber has been studied to replace fluorine rubber used in vehicle gasket. Nano-clay can be used to improve properties by incorporating low contents in the polymer matrix compared with traditional fillers. In this study, Nano-clay/ EPDM nanocomposite were prepared with peroxide curing system. Carbon black, Nano-clay, Talc, and Zinc stearate were used for reinforcement as filler. Some EPDM modified with Maleic anhydride (MAH) for mixes well with certain Nano-clay to nanocomposite. The experimental results from X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that EPDM intercalated the Nanoclay galleries. Mechanical properties were measured by tensile strength and elongation. Durability was characterized by measuring the recovered thickness after 25% compressed at a temperature of 120°C and at a 336 hr (2 weeks).
In recent years, Ethylene-propylene-diene-monomer (EPDM) rubber has been studied to replace fluorine rubber used in vehicle gasket. Nanoclay can be used to improve properties by incorporating low contents in the polymer matrix compared with traditional fillers. These characteristics include strength and storage modulus, heat resistance, thermal stability, gas barrier properties etc. In this study, three kinds of nanoclay/EPDM nanocomposite were prepared with peroxide curing system. Used nanoclay is as follows: Na+ MMT, Cloisite 15A, Cloisite 20A. The experimental results from X-ray diffraction (XRD) and transmission electron microscopy (TEM), atomic force microscopy (AFM) showed that EPDM intercalated the nanoclay galleries. And the rheological properties of EPDM/nanoclay nanocomposites were analyzed by Oscillation disk rheometer (ODR), Moving die Rheometer (MDR) and Capillary rheometer. Mechanical properties were measured by tensile strength and elongation.
Natural rubber has been used in various fields such as adhesive, insulating, and footwear. Carbon black is mainly used as a reinforcing filler in tires and other rubber products. The natural rubber which is reinforced by carbon black leads to increase of the mechanical properties, i.e. elastic modulus and tensile strength, as well as a sharp increase of the hysteresis. In this study, the thermal and mechanical properties of carbon black filled natural rubber (NR) at various aging temperature were investigated. The changes of thermal and mechanical properties were measured as a function of temperature and the relationship was examined. TGA was used to measure the thermal decomposition and to predict of the carbon black content. And DMA and Tensile test were used to measure the changes of mechanical properties such as tensile strength and tan delta. The tensile strength was decreased with increasing aging temperature.
Recently the automotive industry has been required new materials research due to environmental pollution and energy resource depletion. Especially, Vehicle companies are pursuing in through lightweight materials on the fuel efficiency increase and the competitiveness improvement about environmental regulation. Metal materials can be used instead of Plastics that have excellent properties as automotive weight reduction materials. In this study, Weight reduction materials were prepared using Functionalized AESO Rensin and Nano-clay nanocomposite. The AESO/Nano-clay nanocomposites were compounded with various Nano-clay products. TGA were used to measure the changes of thermal stability behavior. DMA were used to measure the mechanical properties as a function of temperature and the relationship was examined. And XRD was used to analyze the structure of AESO/Nano-clay composites. FE-SEM was used to determine the dispersion phase and compatibility of polymer nanocomposites matrix.
The Acrylated Epoxidized Soybean Oil (AESO) has been used in various fields such as coating agent, plasticizers, adhesive paint, electronic circuit board, construction materials, printing. AESO have a disadvantage to thermal properties. In order to increase of thermal properties, used Fumed silica (FS). In this study, thermal decomposition behavior of AESO/FS composites using fumed silica were investigated. The AESO/FS composites were compounded with various fumed silica content (5, 10, 15, 20 wt%). TGA and DMA were used to measure the changes of thermal decomposition behavior and mechanical properties as a function of temperature and the relationship was examined. And XRD was used to analyze the structure of AESO/FS composites. FE-SEM was used to determine the dispersion phase and compatibility of polymer composites matrix. The mass loss was decreased and the glass transition temperature was increased with increasing fumed silica contents.