• Title/Summary/Keyword: Blended study

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A Study on Flammability and Mechanical Properties of HDPE/EPDM/Boron Carbide/Triphenyl Phosphate Blends with Compatibilizer (HDPE/EPDM/Boron Carbide/Triphenyl Phosphate 블렌드의 상용화제 첨가에 따른 난연성 및 기계적 물성 연구)

  • Shin, Bum-Sik;Jung, Seung-Tae;Jeun, Joon-Pyo;Kim, Hyun-Bin;Oh, Seung-Hwan;Kang, Phil-Hyun
    • Polymer(Korea)
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    • v.36 no.5
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    • pp.549-554
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    • 2012
  • It was known that triphenyl phosphate wasn't homogeneously dispersed in HDPE/EPDM/boron carbide blends, which caused the decrease in mechanical properties. HDPE, EPDM, boron carbide, and triphenyl phosphate were blended with PE-g-MAH(polyethylene-graft-maleic anhydride) as a compatiblizer for improving the miscibility of triphenyl phosphate. Tensile strength of HDPE/EPDM/boron carbide blends decreased with increasing the contents of triphenyl phosphate for flammability. However, the mechanical properties of HDPE/EPDM/boron carbide/triphenyl phosphate blends increased by the addition of compatiblizer because triphenyl phosphate was homogeneously mixed in the blend system. The homogeneous dispersibility of triphenyl phosphate was confirmed by using scanning electron microscopy (SEM). Increased thermal stability and flammability derived from high miscibility of triphenyl phosphate were confirmed by the results of thermogravimetric analysis (TGA) and limiting oxygen index (LOI). A self-extinguishing HDPE/EPDM/boron carbide/triphenyl phosphate blend was successfully fabricated with more than 21% LOI.

Improvement of Low-temperature Fluidity of Biodiesel from Vegetable Oils and Animal Fats Using Urea for Reduction of Total Saturated FAME (요소 이용 포화도 저감을 통한 동.식물성 바이오디젤의 저온유동성 개선)

  • Lee, Yong-Hwa;Kim, Kwang-Soo;Jang, Young-Seok;Shin, Jung-Ah;Lee, Ki-Teak;Choi, In-Hu
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.1
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    • pp.113-119
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    • 2014
  • The compositions of saturated and unsaturated fatty acids in biodiesel feedstocks are important factors for biodiesel properties including low-temperature fluidity and oxidative stability. This study was conducted to improve low-temperature fluidity of biodiesel by reducing total saturated FAME (fatty acid methyl ester) in animal fat biodiesel fuels via urea-based fractionation and by mixing plant biodiesel fuels (rapeseed-FAME, waste cooking oil-FAME, soybean-FAME, and camellia-FAME) with enriched-polyunsaturated FAME derived from animal fat biodiesel. Our results showed that the reduction of total saturated FAME in animal fat biodiesel lowered CFPP (Cold Filter Plugging Point) to $-15^{\circ}C$. Mixing plant biodiesel fuels with the enriched-polyunsaturated FAME derived from animal fat biodiesel lowered CFPP of blended biodiesel fuels to $-10{\sim}-18^{\circ}C$.

Carbon-capture Performance of foam Concrete Using Stainless Steel Slag (스테인리스 스틸 AOD 슬래그를 이용한 폼 콘크리트의 탄소포집 성능)

  • Kim, Byung Jun;Yoo, Sung Won;Choi, Young Cheol
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.4
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    • pp.18-25
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    • 2020
  • The purpose of this study is to investigate the mechanical and carbon-capture properties of foam concrete containing stainless steel argon oxygen decarbonization(AOD) slag. AOD slag was used as a binder, and foam concrete having a foaming ratio of 69 ± 0.5 % and a slurry density of 573.2 to 578.6 kg / ㎥ was produced. In order to examine the effect of carbonation, blended specimen was cured by two types : normal curing and CO2 curing. As a result of the experiment, the specimens incorporating AOD slag showed higher compressive strength than Plain after CO2 curing. According to the analysis of the image of foam concrete, it was confirmed that the ST30 has a lower total pore volume and average pore size than plain, resulting in high compressive strength. The SEM analysis confirmed the formation of calcite by carbonation of AOD slag. Through the thermogravimetric analysis, the increase of CO2 uptake was confirmed by the incorporation of AOD slag. Foam concrete has a higher porosity than normal concrete, so it is expected that carbon-capture performance can be improved by using a AOD slag.

A Study on Resistance of Chloride Ion Penetration in Ground Granulated Blast-Furnace Slag Concrete (고로슬래그 미분말 콘크리트의 염화물 침투 저항성에 관한 연구)

  • Song, Ha-Won;Kwon, Seung-Jun;Lee, Suk-Won;Byun, Keun-Joo
    • Journal of the Korea Concrete Institute
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    • v.15 no.3
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    • pp.400-408
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    • 2003
  • Chloride ion inside concrete destroys the so-called passive film surrounding reinforcing bars inside concrete so that the so-called salt attack accelerates corrosion which is the most critical factor for durability as well as structural safety of reinforced concrete structures. Recently, as a solution of the salt attack, the ground granulated blast-furnace slag(GGBFS) have been used as binder or blended cement more extensively. In this paper, characteristics of chloride ion diffusion for the GGBFS concrete, which is known to possess better resistance to damage due to the chloride ion penetration than ordinary portland cement(OPC) concrete possesses, are analyzed and a chloride ion diffusion model for the GGBFS concrete is proposed by modifying an existing diffusion model for the OPC concrete. The proposed model is verified by comparing diffusion analysis results using the model accelerated chloride penetration test results for concrete specimens as well as field test results for an RC bridge pier. Then, an optimal resistance condition to chloride penetration for the GGBFS concrete is obtained according to degrees of fineness and replacement ratios of the GGBFS concrete. The result shows that the GGBFS concrete has better resistance to chloride ion penetration than OPC concrete has and the resistance is more affected by the replacement ratio than the degree of fineness of the GGBFS.

Electrochemical Template Synthesis of Conducting Polymer Microstructures at Addressed Positions (템플레이트의 국소 위치에 형성된 전도성 고분자 미세구조물의 전기화학 합성)

  • Lee Seung Hyoun;Suh Su-Jeong;Yun Geum-Hee;Son Yongkeun
    • Journal of the Korean Electrochemical Society
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    • v.7 no.2
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    • pp.100-107
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    • 2004
  • The nano or micro sized structures of conducting polymer had been prepared by synthesizing the desired polymer within the pores of template of nano or micro porous membrane filter. In this study, we had tried to fabricate conducting polymer microstructures on an electrode by using electrochemical deposition adopting template synthesis. Our attention was focused on two different things, attaching template on the electrode and fabricating microstructures only at limited areas of the electrode. A conducting polymer, PEDiTT (poly 3,4-ethylenedithi-athiophene) solution was blended with PVA(polyvinyl alcohol) solution and used as an conducting adhesive. After attaching template membrane, the electrode were immersed in 0.5M pyrrole in 0.1M KCI solution, and electrochemical polymerization was performed. The growth process of the microstructures studied by SEM. The electrochemical fabrication of conducting polymer was performed by using two-electrode system. A large working electrode and a micro scale disc electrode were used for the confined area synthesis. Polymerization potential was 4V in an electrolytic solution made of KCI in deionized water. The optimum polymerization conditions were, i.e. (4V/100sec) for $250{\mu}m$ electrode and (6V/30 sec) for $10{\mu}m$ electrode.

Change of Hydrolysis Rate on Hydrogenated Palm Kernel Oil and Shea Butter Blendings Using In Vitro Digestion System (In Vitro Digestion에서 팜핵경화유와 시어버터 혼합 비율에 따른 가수분해율 변화)

  • Lee, Hyeon-Hwa;Shin, Jung-Ah;Lee, Ki-Teak
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.46 no.10
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    • pp.1205-1215
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    • 2017
  • In this study, the hydrolysis rate of palm kernel oil (HPKO) and shea butter were compared by in vitro digestion to develop low-digestible fats. HPKO exhibited a higher hydrolysis rate than shea butter. The initial rate and ${\Phi}max$ value of HPKO were 0.315 mM/s and 78.0%, while the corresponding values for shea butter were 0.117 mM/s and 41.4%. When the two fats were blended at various ratios, the hydrolysis rate, in terms of the ${\Phi}max$ value, was similar to that of shea butter until 2:8 (HPKO : shea butter, w/w). After the analysis of triacylglycerol species and the positional fatty acid composition, the factors that affected the hydrolysis rate were determined. The results suggest that the low hydrolysis rate of shea butter would be due mostly to the stearic acid located at the sn-1,3 positions of triacylglycerol molecules. These properties of shea butter are expected to be the nutritional benefits as a low-digestible fat in foods.

Basic Analysis on Fractal Characteristics of Cement Paste Incorporating Ground Granulated Blast Furnace Slag (고로슬래그 미분말 혼입 시멘트 페이스트의 프랙탈 특성에 관한 기초적 분석)

  • Kim, Jiyoung;Choi, Young Cheol;Choi, Seongcheol
    • Journal of the Korea Concrete Institute
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    • v.29 no.1
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    • pp.101-107
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    • 2017
  • This study aimed to conduct the basic analysis on the fractal characteristics of cementitious materials. The pore structure of cement paste incorporating ground granulated blast furnace slag (GGBFS) was measured using mercury intrusion porosimetry (MIP) and the fractal characteristics were investigated using different models. Because the pore structure of GGBFS-blended cement paste is an irregular system in the various range from nanometer to millimeter, the characteristics of pore region in the different scale may not be adequately described when the fractal dimension was calculated over the whole scale range. While Zhang and Li model enabled analyzing the fraction dimension of pore structure over the three divided scale ranges of micro, small capillary and macro regions, Ji el al. model refined analysis on the fractal characteristics of micro pore region consisting of micro I region corresponding to gel pores and micro II region corresponding to small capillary pores. As the pore size decreased, both models suggested that the pore surface of micro region became more irregular than macro region and the complexity of pores increased.

Silica Filler Addition Effect on the Ion Conductivity of PEO Composite Electrolytes Blended with Poly(ethylene imine) (폴리에틸렌 이민과 혼합된 PEO 복합체 전해질의 이온 전도도에 미치는 실리카 필러 첨가 효과)

  • Kim, Juhyun;Kim, Kwang Man;Lee, Young-Gi;Jung, Yongju;Kim, Seok
    • Korean Chemical Engineering Research
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    • v.49 no.4
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    • pp.465-469
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    • 2011
  • In this study, poly(ethyleneoxide) and poly(ethylene imine) polymer blends containing fumed silica fillers were studied in order to enhance the ion conductivity and interfacial properties. Lithium perchlorate ($LiClO_4$) as a salt, and silica($SiO_2$) as the inorganic filler were introduced into the polymer composite electrolyte composites and the composites were examined to evaluate their ionic conductivity for a possibility test of electrolyte application. As the diameter of semicircle in an impedance test became smaller, ionic conductivity of composite electrolytes had been enhanced by addition of 20 wt% silica filler. However, the conductivity was not greatly changed over 20 wt% content because the silica was sufficiently saturated in the polymer electrolytes. Diffraction peaks of PEO became weaker with the addition of inorganic fillers using XRD analysis. It showed that a crystallinity was proportionally reduced by increasing filler contents. The morphology of composite electrolyte films has been investigated by SEM. The heterogeneous morphology which silica was evenly dispersed by the strong adhesion of PEI was shown at higher contents of silica.

Study on deodorizing polyethylene film made from waste shell powder (패각 폐자원을 재활용한 악취제거기능을 갖는 폴리에틸렌 필름에 대한 연구)

  • Chun Byoung Chul;Chung Yong-Chan;Chong Mi Hwa;Park Jung-Hwan;Kweon Oh-Cheul
    • Resources Recycling
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    • v.12 no.1
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    • pp.48-54
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    • 2003
  • Odor-removing polyethylene film utilizing waste shell powder (annual production: 250,000 ton) was prepared. Odor removal was designed to work by cation or cationic surfactant adsorbed onto the shell surface by ion-exchange: cationic surfactants (DTAB (n-dodecyltrimethylammonium bromide), CTAB (n-cetyltrimethylammonium bromide) and DHAB (n-dihexade-cyldimethylammonium bromide), and cations $Ce^{3+}$ , $Mg^{2+}$ and $Al^{3+}$) were used. Surface-modified waste shell powder was com-pounded with LDPE to produce 20 wt% shell masterbatch (MB), and the MB was again blended with LDPE to get shell-containing LDPE films with 3,5, 10 wt% of shell (width: 40 cm, thickness: 40 $\mu\textrm{m}$). Mechanical properties of the various shell-LDPE films maintained more than 80 % of that of pure LDPE film. Both shell film modified with cationic surfactant and one without shell surface-modification showed excellent odor-removing ability.

Preparation of Composite Nafion/polyphenylene Oxide(PPO) with Hetropoly Acid(HPA) Membranes for Direct Methanol Fuel Cells (헤테로폴리산을 포함한 직접 메탄올 연료전지용 나피온/폴리페닐렌옥사이드 복합막의 제조)

  • Kim, Donghyun;Sauk, Junho;Kim, Hwayong;Lee, Kab Soo;Sung, Joon Yong
    • Korean Chemical Engineering Research
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    • v.44 no.2
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    • pp.187-192
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    • 2006
  • The preparation and characterization of new polymer composite membranes containing polyphenylene oxide (PPO) thin films with hetropoly acid (HPA) are presented. PPO thin films with phosphotungstic acid (PWA) or phosphomolybdic acid (PMA) have been prepared by using the solvent mixture. The PWA and PPO can be blended using the solvent mixture, because PPO and PWA are not soluble in the same solvent. In this study, methanol was used as a solvent dissolving PWA and chloroform was used as a solvent dissolving PPO. PPO-PWA solutions were cast onto a glass plate with uniform thickness. The composite membranes were prepared by casting Nafion mixture on porous PPO-PWA films. The morphology and structure of these PPO-PWA films were observed with scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The composite membranes were characterized by measuring their ion conductivity and methanol permeability. The performance was evaluated with composite membranes as electrolytes in fuel cell conditions. The methanol cross-over of composite membranes containing PPO-PWA barrier films in the DMFC reduced by 66%.