• Title, Summary, Keyword: Adhesion Properties

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The epoxy coating interfacial adhesion and corrosion protection properties enhancement through deposition of cerium oxide nanofilm modified by graphene oxide

  • Parhizkar, Nafise;Ramezanzadeh, Bahram;Shahrabi, Taghi
    • Journal of Industrial and Engineering Chemistry
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    • v.64
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    • pp.402-419
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    • 2018
  • This paper aims at improving the cathodic disbonding, corrosion protection and adhesion properties of epoxy coating through steel substrate treatment by cerium nanofilm. For this purpose, the cerium film was modified by graphene oxide nanosheets, which are covalently functionalized with silane coupling agent. The performance of this coating was studied by electrochemical impedance spectroscopy, Pull-off adhesion and cathodic delamination tests and the morphology of the modified cerium film was investigated by field-emission scanning electron microscopy. Results revealed that modifying the cerium nanofilm led to the better adhesion strength, corrosion protection performance and lower cathodic delamination rate of epoxy coating.

The Study on the Properties of EPDM/NR Blends (EPDM/NR 블랜드의 물성에 관한 연구)

  • Go, Jin-Hwan;Park, Sung-Soo
    • Elastomers and Composites
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    • v.29 no.2
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    • pp.121-130
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    • 1994
  • The physical properties of rubber blend between natural rubber(NR) and ethylene propylene diene terpolymer(EPDM) were investigated as a study of EPDM composite materials. For EPDM/NR blends, the effects of ethylene and diene contents in EPDM, blend ratio, dicumyl peroxide(DCP) curing system on the physical properties, interfacial adhesion force and dynamic crack growth etc. were studied. EPDM/NR blends loaded with carbon black were prepared by mechanical mixing and cured by plate heating cure press. Crosslinking density was measured by swelling method with toluene. The physical properties of all blends were measured with Instron, fatigue to failure(FTF), Demattia flex cracking tester(DMFC), scanning electron microscopy (SEM), etc. As the ethylene and diene contents in EPDM increased, the physical properties, such as dynamic crack growth, adhesion to other component were increased too. Interfacial adhesion force of EPDM/NR blends to dissimilar layer was improved by the use of optimum peroxide curing system.

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Investigation on Adhesion Properties of Sandwich Composite Structures Considering on Surface Treatments

  • Park, Gwanglim;Oh, Kyungwon;Kong, Changduk;Park, Hyunbum
    • International Journal of Aerospace System Engineering
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    • v.1 no.1
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    • pp.16-20
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    • 2014
  • Recently, various kinds of study on light weight structure are performing in the world. The Al honeycomb sandwich structural type adopt for improvement of lightness and structural stability to major part structure of aircraft or spacecraft. Adhesion badness properties of adhesive and adhesion properties of fillet mainly studied about al honeycomb structure. But study for adhesive properties of sandwich construction with surface treatment of Aluminum alloy barely performed. In this study, adhesive film was used between Al and honeycomb core of honeycomb panel[1]. The study for adhesive properties of sandwich construction with surface treatment of AA 5052 skin was performed.

A review: role of interfacial adhesion between carbon blacks and elastomeric materials

  • Kang, Min-Joo;Heo, Young-Jung;Jin, Fan-Long;Park, Soo-Jin
    • Carbon letters
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    • v.18
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    • pp.1-10
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    • 2016
  • Carbon blacks (CBs) have been widely used as reinforcing materials in advanced rubber composites. The mechanical properties of CB-reinforced rubber composites are mostly controlled by the extent of interfacial adhesion between the CBs and the rubber. Surface treatments are generally performed on CBs to introduce chemical functional groups on its surface. In this study, we review the effects of various surface treatment methods for CBs. In addition, the preparation and properties of CB-reinforced rubber composites are discussed.

Adhesion and Electrical Performance by Roughness on Semiconductive-Insulation Interface Layer of Silicone Rubber (거칠기에 따른 반도전-절연 계면층에서 접착특성과 절연성능)

  • Lee, Ki-Taek;Hwang, Sun-Mook;Hong, Joo-Il;Huh, Chang-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.78-81
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    • 2004
  • In this paper, the effect of adhesion properties of semiconductive-insulating interface layer of silicone rubber on electrical properties was investigated. Surface structure and adhesion of semiconductive silicon rubber by surface asperity was obtained from SEM and T-peel test. In addition, ac breakdown test was carried out for elucidating the change of electrical property by roughness treatment. From the results, Adhesive strength of semiconductive-insulation interface was increased with surface asperity. Dielectric breakdown strength by surface asperity decreased than initial Specimen, but increased from Sand Paper #1200. According to the adhesional strength data unevenness and void formed on the silicone rubber interface expand the surface area and result in improvement of adhesion. Before treatment Sand Paper #1200, dielectric breakdown strength was decreased by unevenness and void which are causing to have electric field mitigation small. After the treatment, the effect of adhesion increased dielectric breakdown strength. It is found that ac dielectric breakdown strength was increased with improving the adhesion between the semiconductive and insulating interface.

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Adhesion Property of Cu on Low-k : Ti Glue Layer, Boron Dopant, N2plasma effects (Ti glue layer, Boron dopant, N2plasma 처리들이 Cu와 low-k 접착력에 미치는 효과)

  • Lee, Seob;Lee, Jae-gab
    • Korean Journal of Materials Research
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    • v.13 no.5
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    • pp.338-342
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    • 2003
  • Adhesion between Cu and low-k films has been investigated. Low-k films deposited using a mixture of hexamethyldisilane(HMDS) and Para-xylene had a dielectric constant as low as 2.7, showing the thermally stable properties up to $400^{\circ}C$. In this study, Ti glue layer, boron dopant, and $N_2$plasma treatment were used to improve adhesion property of between Cu and low-k films. Ti glue layer slightly improved adhesion property. After $N_2$plasma treatment, the adhesion property was significantly improved due to the increased roughness and the formation of new binding states between Ti and plasma-treated PPpX : HMDS. However, $300^{\circ}C$ annealing of $N_2$plasma treated sample caused the diffusion of Cu into the PPpX : HMDS, degrading the low-k properties. In the case of Cu(B)/Ti/PPpX : HMDS, the adhesion was remarkably increased. This enhanced adhesion was attributed to formation of Ti-boride at the Cu-Ti interface. It is because the formed Ti-boride prevented the diffusion of Cu into the PPpX : HMDS and the Cu-Ti reaction at the Ti interface.

Effect of Adhesion layer on the Optical Scattering Properties of Plasmonic Au Nanodisc (접착층을 고려한 플라즈모닉 금 나노 디스크의 광산란 특성)

  • Kim, Jooyoung;Cho, Kyuman;Lee, Kyeong-Seok
    • Korean Journal of Metals and Materials
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    • v.46 no.7
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    • pp.464-470
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    • 2008
  • Metallic nanostructures have great potential for bio-chemical sensor applications due to the excitation of localized surface plasmon and its sensitive response to environmental change. Unlike the commonly explored absorption-based sensing, the optical scattering provides single particle detection scheme. For the localized surface plasmon resonance spectroscopy, the metallic nanostructures with controlled shape and size have been usually fabricated on adhesion-layer pre-coated transparent glass substrates. In this study, we calculated the optical scattering properties of plasmonic Au nanodisc using a discrete dipole approximation method and analyzed the effect of adhesion layer on them. Our result also indicates that there is a trade-off between the surface plasmon damping and the capability of supporting nanostructures in determining the optimal thickness of adhesion layer. Marginal thickness of Ti adhesion layer for supporting Au nanostructures fabricated on a silica glass substrate was experimentally analyzed by an adhesion strength test using a nano-indentation technique.

Effect of Crosslinking Agent on Adhesion Properties of UV Curable 2-EHA/AA Pressure Sensitive Adhesive (UV경화형 2-EHA/AA 점착제의 점착특성에 대한 경화제의 영향)

  • Kim, Ho-Gyum;Min, Kyung-Eun
    • Polymer(Korea)
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    • v.39 no.2
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    • pp.281-286
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    • 2015
  • UV-cured acrylic copolymer pressure sensitive adhesive (PSA) having different amounts of crosslinking agents were prepared and adhesion properties were investigated. 0.01 wt% of MMT clay was dispersed in 2-ethylhexyl acrylate (2-EHA)/acrylic acid (AA) monomer mixture containing 0, 0.05, 0.1 and 0.3 wt% 1,6-hexandiol diacrylate (HDDA) for crosslinking. It was investigated that the curing behavior and surface chemistry of PSAs were merely affected by the presence of MMT clays. On the other hand, adhesive properties were influenced by the MMT addition; a cohesive failure was restrained due to improved molecular elasticity even in uncrosslinked acrylic PSAs. However, it was also appeared that combination of 0.3 wt% crosslinking agent and MMT loading might result in the damage of adhesion properties of PSAs possibly due to the lack of chain flexibility. In our studies, it is suggested that the 2-EHA/AA PSAs incorporating 0.01 wt% of MMT and crosslinked with 0.05 wt% of HDDA exhibited the balanced adhesion properties without severe cohesive failure during strip.

A Study on the Nonlinear Viscoelastic Properties of PBXs (복합화약의 비선형 점탄성 특성 연구)

  • Shim Jung-Seob;Kim Hyoun-Soo;Lee Keun-Deuk;Kim Jeong-Kook
    • Journal of the Korea Institute of Military Science and Technology
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    • v.7 no.2
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    • pp.100-108
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    • 2004
  • Nitramine-polymer composites suffer from a problem known as dewetting. Dewetting adversely affects the performance and the sensitivity characteristics of an explosive composition. Voids, which are generated between explosive particles and binder on dewetting, act as initiation sites. For a PBXs as well as propellants, where good adhesion and mechanical properties are of great importance, dewetting therefore must be prevented by strong adhesion between the filler and the binder. The surface energy of materials is measured by Wilhelmy plate and wicking method. The interfacial energy between the filler and the binder is calculated from the disperse phase and the polar phase of surface energy. Time dependent compressive properties of composite explosives have been determined by stress-strain curves obtained at different strain rates and temperatures. The interfacial state of the PBX was observed through SEM. It was found from the result that the interface between the explosive and the binder becomes better adhesion with decreasing interfacial tension and increasing work of adhesion. The result clearly shows that the castable PBX has good adhesion more than the pressable PBX.

Effect of Paraffin Oil on the Low Temperature Adhesion Properties of CR/SBS Modified Asphalt Sealants (CR/SBS 개질 아스팔트 실란트의 저온접착특성에서 파라핀 오일 첨가에 의한 효과)

  • Kim, Doo Byung;Lee, Dae Woo;Kim, Jong-Seok
    • Korean Chemical Engineering Research
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    • v.50 no.1
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    • pp.6-10
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    • 2012
  • The main objective of this work was studying the influence of paraffin oil(PO) on the adhesion properties at low temperature in styrene-butadiene-styrene(SBS) copolymer and crumb rubber(CR) modified asphalt. The temperature susceptibility of SBS/CR asphalt and PO/SBS/CR/asphalt blends were measured by penetration and softening point. Adhesion properties at low temperature and dispersion of modifiers in PO/SBS/CR/asphalt blends were evaluated by universal test machine and florescence microscopy, respectively. The adhesion properties of PO/SBS/CR/asphalt blends at low temperature increased in the proportion of SBS contents with both 5 and 10 wt % of paraffin oil. Results showed that the maximum tensile adhesion strength and toughness energy at $-20^{\circ}C$ were obtained when PO and SBS contents were 10 wt % and 6 wt %, respectively. The addition of PO is effective for enhancing the flexibility of SBS/CR/asphalt blends and leads to the increase of toughness at low temperature.