• Title/Summary/Keyword: Amine additives

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Study on the Thin-walled carbon nanotubes (TWNTs)/Amine epoxy additive composite via supercritical fluid process (초임계 공정을 이용한 Thin-walled carbon nanotubes (TWNTs)/아민계 에폭시 첨가제의 복합체 제조)

  • Kim, Yong-Ryeol;Jeong, Hyeon-Taek
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.3
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    • pp.486-491
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    • 2014
  • We have been fabricated Thin-walled carbon nanotubes (TWNTs)/amine epoxy additives composite using Eco-friendly solvent system such as supercritical process and dry mixed process. TWNTs/amine epoxy additives composite has used as a curing agent for urethane based bisphenol A type epoxy resin. The thermo-mechanical property of the epoxy resin cured by TWNTs/amine epoxy additives composite is characterized by dynamic mechanical analysis(DMA) and dispersability of the nanotubes in the epoxy matrix is also confirmed by scanning electron microscope(SEM). As a results, the epoxy resin cured by TWNTs/amine epoxy additives composite with supercritical process shows enhanced dispersability of the TWNTs in the matrix and thermo-mechanical property when compare to dry mixed process.

EFFECTS OF AMINES ON COPPER ETCHING WITH H$_2$SO$_4$-$H_2O$$_2$ SYSTEMS

  • Kobayashi, Katsuyoshi;Minami, Naoki;Chiba, Atsushi
    • Journal of the Korean institute of surface engineering
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    • v.32 no.3
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    • pp.377-384
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    • 1999
  • The corrosion of copper in $H_2$$SO_4$ $-H_2$$O_2$ etching solutions with amines was investigated at various flow rates (v). Amine additives give a retardation of $H_2$$O_2$ decompositions, increases in both corrosion rates and etch factor, and a protection of etched copper surfaces. However n-alkylamine additives acted as corrosion inhibitors at v < 10cm/s, those acted as corrosion accelerators at v of 10-220cm/s. The maximum corrosion rate was obtained with about 0.1 molal concentration of additives. Steric effects of substituted groups suppressed the acceleration of copper corrosion. The increases in both corrosion rates and flow rates gave the increase in etch factor. Corrosion rates with n-alkylamine increased in the order of ethylamine < n-propylamine < n-butylamine, those with butylamine isomers tert- < sec- < iso- < n-butylamine, and those with amine additives of different number of substituted groups tri- < di- < mono-n-propylamine, respectively.

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Particle Shapes and Optical Property of Synthesized ZnO with Amine Additives (아민첨가제를 사용하여 합성된 ZnO의 입자형상 및 광학적 특성)

  • Hyeon, Hye-Hyeon;Hyun, Mi-Ho;Lee, Dong-Kyu
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.1
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    • pp.23-29
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    • 2016
  • Zinc oxide of hexagonal wurzite, is known as n-type semiconductor. It has a wide band gap energy of 3.37 eV and large exciton binding energy of 60 meV. It can be widely applied to gas sensors, laser diodes, dye-sensitized solar cells and degradation of dye waste. The use of microwave hydrothermal synthesis brings a rapid reaction rate, high yield, and energy saving. Amine additives control the different particle shapes because of the chelate effect and formation of hydroxide ion. In this study, zinc nitrate hexahydrate was used as zinc precursor. In addition, ethanolamine, ethylenediamine, diethylenetriamine, and hexamethylenetetramine are used as shape control agent. The pH value was controlled as 11 by NaOH. The shapes of zinc oxide are star-like, rod, flower-like, and circular cone. In order to analyze physical, chemical, and optical properties of ZnO with diverse amine additives, we used XRD, SEM, EDS, FT-IR, UV-Vis spectroscopy, and PL spectroscopy.

Investigation of anti-wear additives for synthetic esters; Amine salts of phosphonic acid

  • Hasegawa, T.;Minami, I.;Kidera, Y.;Hirao, K.;Memita, M.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.10b
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    • pp.269-270
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    • 2002
  • Antiwear(AW) properties of phoshphonic acid derivatives for trimethylolpropane (TMP) esters were investigated under boundary conditions. AW effect of dialkyl phosphonates depends on polarity of base fluid. They provide good AW performance in less polar TMP esters, whereas their AW effect is not sufficient in polar TMP esters. Amine salts of phosphonic acid were developed as new AW additiνe system for TMP esters. They provide excellent AW performance even in polar TMP esters.

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A study on the Property of Oxidation Stability in Biodiesel by the Additives (첨가제에 따른 바이오디젤 산화안정 특성 연구)

  • Kang, Hyung-Kyu;Song, Ho-Yong;Doe, Jin-Woo;Park, Soo-Youl;Na, Byung-Ki
    • Journal of the Korean Applied Science and Technology
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    • v.32 no.4
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    • pp.639-648
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    • 2015
  • Some materials of fatty acids in the biodiesel affect the physical/chemical properties like density, kinematic viscosity, total acid number and oxidation stability by forming an organic fatty acid in combination with oxygen in the air. To solve the problem of the oxidative stability of biodiesel, various kinds of antioxidant has added and analyze the characteristics of the physical/chemical property changes by the addition of antioxidant. Oxidation stability increased by the increase of additives content. The TBHQ among the seven kinds of the additives showed the best performance. Also, 4 kinds of additives like propyl gallate, butyl-amine and pyrogallo has showed above 10 hr of oxidation stability at the addition of 500 ppm. In case of pyrogallo, this is not appropriate as an additive to suitable quality standards of total acid number. TBHA, DTBHQ of hydroquinone was satisfied with the quality standard of oxidation stability but the target of this research(above 10 hr) did not satisfied with oxidation stability. Propyl gallate is also a suitable at the quality standards of total acid number but it was shown not to be an appropriate to the additives due to increasing the total acid number by increasing of the content of additives at the addition of 500 ppm.

Effects of Inorganic-organic Additives on CO2 Adsorption of Activated Carbon (활성탄의 이산화탄소 흡착에 미치는 유무기계 첨가제의 영향)

  • Jo, Dong-Hyun;Cho, Ki-Sook;Park, Cheong-Gi;Kim, Sung-Hyun
    • Korean Chemical Engineering Research
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    • v.50 no.5
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    • pp.885-889
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    • 2012
  • In this study, amine and metal oxide additives were investigated to improve $CO_2$ adsorption capacity of activated carbons (ACs). The characteristics of surface modified ACs were studied by X-ray photoelectron spectroscopy (XPS), $N_2$ adsorption, X-ray diffraction (XRD), and BET. Amine surface treatment decreased specific surface area and pore volume of ACs, but increased alkalinity by the incorporated nitrogen functional groups. Adsorption capacities of amine functionalized ACs was larger than original ACs, because basic group which can react with $CO_2$ was grafted on the ACs surface. Presence of copper oxides on ACs also enhances the carbon dioxide adsorption. The copper oxides could increase the adsorption rate of carbon dioxides due to the acid-base interaction (or electron acceptor-donor interaction). It was found that copper oxide loading was a promising method to improve the $CO_2$ adsorption capacity of ACs.

Study on Soft Etching Material Development to Improve Peel Strength between Surface of Copper and Solder Resist Ink (구리 표면과 Solder Resist Ink 사이의 밀착력 향상 위한 Soft Etching제 개발을 위한 연구)

  • Kang, Yun-Jae;Hong, Min-Eui;Kim, Duk-Hyun
    • Applied Chemistry for Engineering
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    • v.20 no.2
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    • pp.172-176
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    • 2009
  • In this research, we defined the basic structure of soft etching material as $H_2SO_4/H_2O_2$, and used additives as inhibitor, surfactant, and stabilizer. By analyzing influence to surface roughness and change of etching rate related to type and density of additives, we research to develop soft etching material having the same adhesiveness as existing etching material. As a result of research, it is estimated that after densities of $H_2O_2$ and $H_2SO_4$ are 3%, 4% respectively, 500 ppm of amine type 5-Azol, as inhibitor, and 600 ppm of PEI, as surfactant, and 10 ppm of phosphoric acid, as stabilizer, are added, is the most reasonable surface roughness and etching rate. As result of solder test, it is estimated that solder resist ink did not peel away or curl up and have reliable adhesiveness.

The Effect of Ice Adhesion according to Functional Group and Chemical Structure of Additive (화합물 작용기와 화학구조에 따른 수용액의 빙부착 억제 효과)

  • Chung, Dong-Yeol;Peck, Jong-Hyeon;Kang, Chae-Dong;Hong, Hi-Ki
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.8
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    • pp.607-614
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    • 2007
  • This paper investigated that the functional group and chemical structure of additives affect ice adhesion in aqueous solutions cooling with stirring. In order to compare the effect on the ice adhesion in aqueous solutions, the functional group like carboxyl (-COOH), hydroxyl(-OH) or amine($-NH_{2}$) one were compared each other. Among the functional group, the strength of the hydrogen bonding force order is amine, hydroxyl and carboxyl one. It supports that ethylene diamine 7 mass% solution including amine group was effective to suppress the ice adhesion, though it is corrosive. Also, the ice adhesion were effectively resisted and formed lots of ice slurries in cooling experiment of 7 mass% solution of 1, 2-and 1, 3-propanediol which is different molecular structure but equal molecular weight each other.

Adsorption of Carbon Dioxide onto Tetraethylenepentamine Impregnated PMMA Sorbents with Different Pore Structure

  • Jo, Dong Hyun;Park, Cheonggi;Jung, Hyunchul;Kim, Sung Hyun
    • Korean Chemical Engineering Research
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    • v.53 no.3
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    • pp.382-390
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    • 2015
  • Poly(methyl methacrylate) (PMMA) supports and amine additives were investigated to adsorb $CO_2$. PMMA supports were fabricated by using different ratio of pore forming agents (porogen) to control the BET specific surface area, pore volume and distribution. Toluene and xylene are used for porogens. Supported amine sorbents were prepared by wet impregnation of tetraethylenepentamine (TEPA) on PMMA supports. So we could identify the effect of the pore structure of supports and the quantity of impregnated TEPA on the adsorption capacity. The increased amount of toluene as pore foaming agent resulted in the decreased average pore diameter and the increased BET surface area. Polymer supports with huge different pore distribution could be fabricated by controlling the ratio of porogen. After impregnation, the support with micropore structure is supposed the pore blocking and filling effect so that it has low $CO_2$ capacity and kinetics due to the difficulty of diffusing. Macropore structure indicates fast adsorption capacity and low influence of amine loading. In case of support with mesopore, it has high performance of adsorption capacity and kinetics. So high surface area and meso-/macro- pore structure is suitable for $CO_2$ capture.