• Title, Summary, Keyword: Adhesion Properties

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Adhesion and Electrical Performance by Plasma Treatment of Semiconductive Silicone Rubber (반도전성 실리콘 고무의 플라즈마 표면처리에 따른 접착특성과 절연성능)

  • Hwang, Sun-Mook;Lee, Ki-Taek;Hong, Joo-Il;Huh, Chang-Su
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.5
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    • pp.450-456
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    • 2005
  • In this paper, the effect of adhesion properties of semiconductive-insulating interface layer of silicone rubber on electrical properties was investigated. The modifications produced on the silicone surface by oxygen plasma were accessed using ATR-FTIR, contact angle and Surface Roughness Tester. Adhesion was obtained from T-peel tests of semiconductive layer haying different treatment durations. In addition, ac breakdown test was carried out for elucidating the change of electrical property with duration of plasma treatment. From the results, the treatment in the oxygen plasma produced a noticeable increase in surface energy, which can be mainly ascribed to the creation of O-H and C=O. It is observed that adhesion performance was determined by surface energy and roughness level of silicone surface. It is found that at dielectric strength was increased with improving the adhesion between the semiconductive and insulating interface.

Interfacial Phenomena of Lignocellulose Fiber/Thermoplastic Polymer Composites (리그노셀룰로오스 섬유/열가소성 고분자 복합재의 계면 현상)

  • Son, Jungil;Yang, Han-Seung;Kim, Hyun-Joong
    • Journal of Adhesion and Interface
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    • v.3 no.4
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    • pp.44-52
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    • 2002
  • Composite materials are created by combining two or more component to achieve desired properties which could not be obtained with the separate components. The use of reinforcing fillers, which can reduce material costs and improve certain properties, is increasing in thermoplastic polymer composites. Currently, various inorganic fillers such as talc, mica, clay, glass fiber and calcium carbonate are being incorporated into thermoplastic composites. Nevertheless, lignocellulose fibers have drawn attention due to their abundant availability, low cost and renewable nature. In recent, interest has grown in composites made from lignocellulose fiber in thermoplastic polymer matrices, particularly for low cost/high volume applications. In addition to high specific properties, lignocellulose fibers offer a number of benefits for lignocellulose fiber/thermoplastic polymer composites. These include low hardness, which minimize abrasion of the equipment during processing, relatively low density, biodegradability, and low cost on a unit-volume basis. In spite of the advantage mentioned above, the use of lignocellulose fibers in thermoplastic polymer composites has been plagued by difficulties in obtaining good dispersion and strong interfacial adhesion because lignocellulose fiber is hydrophilic and thermoplastic polymer is hydrophobic. The application of lignocellulose fibers as reinforcements in composite materials requires, just as for glass-fiber reinforced composites, a strong adhesion between the fiber and the matrix regardless of whether a traditional polymer matrix, a biodegradable polymer matrix or cement is used. Further this article gives a survey about physical and chemical treatment methods which improve the fiber matrix adhesion, their results and effects on the physical properties of composites. Coupling agents in lignocellulose fiber and polymer composites play a very important role in improving the compatibility and adhesion between polar lignocellulose fiber and non-polar polymeric matrices. In this article, we also review various kinds of coupling agent and interfacial mechanism or phenomena between lignocellulose fiber and thermoplastic polymer.

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Influence of Processing Conditions on the Physical Properties of Crumb Rubber Modified Asphalts (폐타이어 고무분말 개질 아스팔트의 물리적 특성에 대한 공정조건의 영향)

  • O, Kwang-Joong;Kim, Jong-Seok
    • International Journal of Highway Engineering
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    • v.10 no.3
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    • pp.239-246
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    • 2008
  • In this study, the influence of reaction temperatures, mixing time and flexible modifier for crumb rubber modified asphalt(CRMA) as processing conditions were investigated. The temperature susceptibility and adhesion properties of neat and modified asphalts at low temperature measured using the penetration and tensile adhesion test. It was found that processing temperatures and flexible modifier were important factors for tensile adhesion strength and toughness energy at low temperature. The CRMA in the higher processing temperature and flexible modifier exhibited improved tensile adhesion properties which indicated the flexible structure of neat and modified asphalt binder. In general, the improvements of the physical properties in the CRMAs were due to the improvements of miscibility between CR and asphalt binder. It was found that the adhesion properties of the flexible agent modified CRMA were higher than CRMA were related to the flexible agent tend to penetrate into CR particles and asphalt binder.

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Analysis of surface interaction between filler and binder of PBXs (복합화약 원료들간의 표면특성 해석)

  • 심정섭
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.1
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    • pp.207-215
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    • 2001
  • Plastic bonded explosive(PBX) is mainly composed of the nitramine-ploymer compositions. PBX is characterized by high velocity and pressure of detonation, low vulnerability and good thermal stability. Many important applications of PBX require the good adhesion between nitramine crystals and the binder. For PBXs as well as propellants, where good mechanical properties are of great importance, dewetting therefore must be prevented by strong adhesion between filler-binder. Adhesion depends on surface characteristics of filler and binder. In order to design for better adhesion, an understanding of the surface properties of explosive and binder is required. The surface free energies are calculated from contact angle values by the method of Kaelble. Critical surface tension of solids are calculated by Zisman plot. Critical surface tension is a useful parameter for characterizing the wettability of solid surface. In this study, HMX and 3 kinds of copolymers are selected, since they are widely used in many plastic bonded explosives. The technical objective of this investigation is to predict the interaction between filler and binder from their surface free energies.

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Influence of processing parameters for adhesion strength of TiAlN films prepared by Arc Ion Plating

  • Ju, Yun-Gon;Fang, W.;Jo, Dong-Yul;Yun, Jae-Hong;Zhang, S.H.
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • pp.136-137
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    • 2007
  • Wear resistant TiAlN thin film has been widely deposited on the surface of cutting and forming tools by using Arc Ion Plating. TiAlN films are deposited by the processes designed by the Taguchi L18 experimental design. The L18 experimental design is applied to achieve surface properties and adhesion. The deposition parameters are working pressure, substrate temperature, bias voltage, arc power and pre-sputtering bias voltage and time. The most influential parameters on surface properties and adhesion are substrate bias voltage, working nitrogen pressure and arc power. The optimal coating processes are obtained for surface properties and adhesion.

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Preparation and Characterization of Anionic Emulsified Asphalt with Enhanced Adhesion Properties

  • Lee, Eun-Kyoung
    • Elastomers and Composites
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    • v.50 no.4
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    • pp.304-313
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    • 2015
  • In this study, the anionic emulsified asphalt was prepared by dispersing asphalt particles evenly into water with combination of anionic and nonionic surfactants. Effects of NaOH and $CaCl_2$ on the phase stability of the emulsified asphalt were also investigated through zeta potential value and rheology behavior; the emulsified asphalt added with NaOH and $CaCl_2$ showed higher zeta potential value than that the asphalt with addition of only anionic and nonionic surfactants. In addition, with regard to shear thinning behaviors, it was found that pH of the emulsified anionic asphalt and $Ca^{2+}$, counter ion, affected the phase stability. SBR (styrene-butadiene-rubber) latex, EPD (water dispersed Epoxy), PU (polyurethane) and RI-10S, SBS (styrene-butadiene-styrene)-based property improvement additive, were used and studied to enhance the adhesion properties with the aggregates. RI-10S, however, was found to be only compatible with the anionic emulsified asphalt; the coating rate, adhesion and compression strength were increased with the RI-10S content.

Characterization of Adhesion of Bifidobacterium sp. BGN4 to Human Enterocyte-Like Caco-2 Cells

  • Kim, In-Hee;Park, Myung-Soo;Ji, Geun-Eog
    • Journal of Microbiology and Biotechnology
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    • v.13 no.2
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    • pp.276-281
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    • 2003
  • The adhesion of probiotic bacteria to the intestinal mucosa is one of the desirable properties for their colonization in the intestinal tract, where these bacteria constantly compete with other bacteria. The adhesion of different strains of bifidobacteria to Caco-2 cells was compared. Among the strains examined, BGN-4 showed the highest adhesion level and the greatest cell surface hydrophobicity (CSH). No close relationship was found between the adhesion and CSH of the strains. Upon protease and heat treatment, the adhesion of the BGN-4 to the Caco-2 cells decreased significantly. The cells grown at $42^{\circ}C$ showed a lower CSH and self-aggregation levels than cells grown at $37^{\circ}C$. The treatment of EGTA did not have any effect on the adhesion. The degree of adhesion did not differ among the experimental groups in which galactose, mannose, or fucose were added in the adhesion assay mixture. The results suggest that the adhesion of the Bifidobacterium to the epithelial cells may be affected by the composition and structure of the cell membrane and interacting surfaces.

Effect of Substrate Roughness on the Adhesion of TiN Deposition by PACVD (플라즈마 화학증착법에 있어 모재의 표면조도가 TiN 박막층의 밀착력에 미치는 영향에 관하여)

  • Kang, H.Y.;Kim, M.I.
    • Journal of the Korean Society for Heat Treatment
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    • v.4 no.2
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    • pp.27-37
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    • 1991
  • The adhesion strength of TiN films to substrate(STC 3) steel has been studied using the scratch adhesion test. Before deposition, the substrates were mechanically polished and TiN films were deposited at different substrate temperature($480^{\circ}C-540^{\circ}C$). The chemical properties of TiN films were investigated by RBS, and EDS, and the physical properties were investigated by micro-hardness tester, SEM, and X-ray diffractometer. According to results of this study, the adhesion strength of TiN films increase with increasing the deposition temperature. The roughness of the polished substrates surface were measured with a profilometer. It was observed that, as a general rule, the adhesion strength of deposited TiN films increase with decreasing the substrates surface roughness.

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Improvement of Adhesion Strength of DLC Films on Nitrided Layer Prepared by Linear Ion Source

  • Shin, Chang-Seouk;Kim, Wang-Ryeol;Park, Min-Seok;Jung, Uoo-Chang;Chung, Won-Sub
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.177-179
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    • 2011
  • The purpose of this study is to enhance an adhesion between substrate and Diamond-like Carbon (DLC) film. DLC has many outstanding properties such as low friction, high wear resistance and corrosion resistance. However, it is difficult to achieve enough adhesion because of weak bonding between DLC film and the substrate. For improvement adhesion, a layer between DLC film and the substrate was prepared by dual post plasma. DLC film was deposited on nitrided layer by linear ion source. The composed compound layer between substrate and DLC film was investigated by Glow Discharge Spectrometer (GDS) and Scanning Electron Microscope (SEM). The synthesized bonding structure of DLC film was analyzed using a micro raman spectrometer. Mechanical properties were measured by nano-indentation. In order to clarify the mechanism for improvement in adhesive strength, it was observed by scratch test.

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Adhesion Strength and Other Mechanical Properties of SBR Modified Concrete

  • Chmielewska, Bogumila
    • International Journal of Concrete Structures and Materials
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    • v.2 no.1
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    • pp.3-8
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    • 2008
  • Polymer-cement composites are known repair materials. The aim of this work is to investigate the influence of various amount of dispersion of carboxylated styrene-butadience copolymer on the selected mechanical properties of polymer-cement concrete (PCC) and on its adhesion to ordinary concrete. The compressive, flexural and tensile strengths as well as frost resistance and fracture resistance of the composites are tested. Adhesion strength of PCC to ordinary concrete, as one of most important performance of good repair material is evaluated and analyzed using three test methods. The results obtained in standard pull-off test are compared with the two other tests. The first one, which is an adaptation of WST (wedge splitting test) characterizes crack propagation in the plane of bond created during repair. In the second test the resistance to shear is a measure of adhesion strength.