• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.05b
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• pp.11-14
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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. The modifications produced on the silicone surface by oxygen plasma were accessed using ATR-FTIR, contact angle and AFM. Adhesion was obtained from T-peel tests of semiconductive layer having 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 the creation of O-H and C=O. It is observed that adhesion performance was determined by not surface energy but roughness level of silicone surface. It is found that ac dielectric strength was increased with improving the adhesion between the semiconductive and insulating interface.

• Journal of Adhesion and Interface
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• v.13 no.4
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• pp.182-187
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• 2012

In making emulsion-type pressure sensitive adhesive (PSA), environmentally friendly sorbitan nonionic surfactants having various chemical structures were prepared and used to find out the possibility of substituting the traditional nonyl-phenyl nonionic surfactant (NPE40) by comparing their adhesive properties. Results exhibited that the PSA used NSR10-series and Tween 60 showed better adhesive properties in initial ball tack, peel strength and holding power than those of NPE40. The reason for this is their particular chemical structure and the proper ratio of hydrophobic groups to the ethylene oxide groups.

• Korean Journal of Metals and Materials
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• v.47 no.11
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• pp.740-747
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• 2009

The purpose of this study is to identify the effect of electrolyte compositions on electrodeposited copper foil. First of all, the polyimide substrate was pretreated with plasma. Finally, copper foil was deposited on a Cu/Ni/Polyimide substrate using the electroplating technique. As the quantity of Cu increased, preferred orientations changed into (111). Increasing sulfuric acid, on the other hand, brought down the preferred orientation of (111). The lowest sheet resistance, surface roughness, and fine adhesion were detected when the ratio of $Cu^{2+}$ and $H_2SO_4$ is 50:50(g/l).

• Journal of Adhesion and Interface
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• v.10 no.3
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• pp.148-153
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• 2009

An atmospheric plasma pre-treatment method was applied to PU foam, Leather (Action), Rubber to improve its adhesion using solvent and water soluble type pressure sensitive adhesion in atmospheric plate type reactor. In order to investigate the optimum reaction condition of plasma treatment, type of reaction gas (nitrogen), rate of gas flow (30~100 mL/min), and reaction time (0~30 s) were examined in a plate plasma reactor. The result of the surface modification with respect to the treatment procedure was characterized by using SEM. Due to a de-crease of the contact angle of various materials, the greatest adhesion strength was achieved at optimum condition such as flow rate of 100 mL/min, reaction time of 10 second for an atmospheric plasma treatment of the PU foam, EVA foam, Leather (Action) and Rubber also resulted in the improvement of the adhesion.

• Journal of Adhesion and Interface
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• v.11 no.1
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• pp.35-40
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• 2010

In this study, solvent based polyurethane (PU) adhesives were prepared with the hydrocarbon resin and the acrylic modified hydrocarbon resin contents. The solvent based PU adhesive were increased with increasing tackifier concentration. The surface state of films showed good compatibility with increasing the PX-95 concentration but A-1100 series didn't present homogeneous phase more than 10 phr. Mechanical strength and peel strength were maximum at 5 phr tackifier concentration especially PX-95 series in solvent based PU adhesive.

• Journal of Conservation Science
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• v.22
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• pp.77-86
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• 2008

The pre-treatment for conservation must be needed for the exhumed historic sites. So, the study of conservation and restoration of historical sites has progressed favorably with using various polymers for solving upper problems. The problems which should be essentially solved for conservation of the exhumed historic sites are, however, using reinforcing agents that don't impair their original forms and sorting reinforcing agents on the lines of the historic sites' soil. These agents should be able to use without the effect of outer environments like marsh, winter time or temperature. In this work, we synthesized Epoxy resin and Epoxy hardener for the restoration of historical sites. These products have very good tension strength and adhesion strength and various physical properties that the users want. Particularly, these epoxy with high viscosity have good separation of between Epoxy final product and Urethane pre-surface.

• Journal of Adhesion and Interface
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• v.10 no.1
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• pp.1-10
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• 2009

The waterborne acrylic pressure-sensitive adhesive in the basis of butylacylate (BA) and 2-Ethylhexylacrylate (2-EHA) was synthesized and the methyl methacrylate (MMA) have been used to give the rigidity perfroamce. The polymreric latex was synthesized using butyl acrylate (BA), 2-ethylhexyl acrylate (EHA), methyl methacrylate (MMA) and each 1, 2, 3% of various functional monomers. The dimethyl-2-imidazlidon acrylate and 2-acrylamido-2-methyl-1-propanesulfonate was used in order to increase the wetting properties of acrylic emulsion. To study of properties of functional monomer, The polymreric latex was synthesized various functional monomers each 1, 2, 3%. The 2-acrylamido-2-methyl-1-propanesulfonate showed the best properties. Latex with acrylic acid and dimethyl-2-imidazlidon acrylate had good peel strength, holding power, but it showed that they didn't separate from adhered cleanly by weak cohesion strength. The adhesion performance was increased by increasing amount of 2-acrylamido-2-methyl-1-propanesulfonate however latexes with upper 7% 2-acrylamido-2-methyl-1-propanesulfonate showed that the properties of PSA decreased.

• Elastomers and Composites
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• v.52 no.2
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• pp.136-142
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• 2017

Using various compositions of thermally conductive inorganic fillers with boron nitride (BN) and aluminum oxide ($Al_2O_3$), solventless UV-curable thermally conductive acrylic pressure sensitive adhesives (PSAs) were prepared. The base of the PSAs consists of 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, and isobornyl acrylate.The compositions of the thermally conductive inorganic fillers were 10, 15, 20, and 25 phr in case of BN, and 20:0, 15:5, 10:10, 5:15, and 0:20 phr in case of $BN/Al_2O_3$. The adhesion properties like peel strength, shear strength, and probe tack, and the thermal conductivity of the prepared PSAs were investigated with different thermally conductive inorganic filler contents. There were no significant changes in photo-polymerization behavior with increasing BN or $BN/Al_2O_3$ content. Meanwhile, the conversion rate and transmittance of the PSAs decreased and their thermal stabilities increased with increasing BN content. Their adhesion properties were also independent of the BN or $BN/Al_2O_3$ content. The dispersibility of BN in the acrylic PSAs was better than that of $Al_2O_3$ and it ranked the thermal conductivity in the following order: BN > $BN/Al_2O_3$ > $Al_2O_3$.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.4
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• pp.395-403
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• 2012

This is direct bonding many of the metal bumps between FPCB and HPCB substrate. By using an ultrasonic horn mounted on an ultrasonic bonding machine, it is possible to bond gold pads onto the FPCB and HPCB at room temperature without an adhesive like ACA or NCA and high heat and solder. This ultrasonic bonding technology minimizes damage to the material. The process conditions evaluated for obtaining a greater bonding strength than 0.6 kgf, which is commercially required, were 40 kHz of frequency; 0.6MPa of bonding pressure; and 0.5, 1.0, 1.5, and 2.0 s of bonding time. The peel off test was performed for evaluating bonding strength, which was found to be more than 0.80 kgf.

• Journal of Adhesion and Interface
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• v.12 no.4
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• pp.125-132
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• 2011

As the enhancement of indoor air quality is increasingly compelling the use of natural materials without any emission, this study reports the preparation and performance of natural garlic adhesives for wallpaper. The natural garlic adhesives were successfully prepared by the extraction of the clove of raw garlic with water to isolate carbohydrates and proteins. Properties of the prepared garlic adhesives such as the non volatile solids content, viscosity, density, and pH were 62%, 2,789 mPa.s, $1.3g/cm^3$, and 6.6, respectively. The non-volatile solids content has a great impact on the adhesion performance of the prepared garlic adhesives, which was adequate about 60%. Bonding strength of prepared garlic adhesives was greater than the requirement of a Korean standard for wallpaper. In addition, the garlic adhesives showed antibacterial activity inheriting from the garlic. It is expected that the prepared garlic adhesives could be used as safe and natural adhesives without emitting any volatile organic compounds and formaldehyde gas.