• Magazine of the Korea Concrete Institute
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• v.19 no.2
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• pp.66-70
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• 2007

• Journal of Adhesion and Interface
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• v.23 no.4
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• pp.108-115
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• 2022

In this study, we synthesized poly(itaconic acid-co-acrylamide) (IAcAAM) used as a novel polymer adhesion promoter to improve the adhesion strength of surface-treated Cu lead frames and epoxy composites. IAcAAM comprising itaconic acid, acrylamide was prepared through radical aqueous polymerization. The chemical structure and properties of IAcAAM was analyzed by FT-IR, ¹H-NMR, GPC, and DSC. The surface of the copper lead frame was treated with high temperature, alkali, and UV ozone to reduce the water contact angle and increase the surface energy. The adhesive strength of Cu lead frame and epoxy composite increased with the decrease of contact angle. The adhesive strength of Cu lead frame/epoxy composite increased with the addition of IAcAAM in epoxy composite. As silica content increased, the adhesive strength of Cu lead frame and epoxy composite tended to slightly decrease.

• The korean journal of orthodontics
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• v.26 no.3
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• pp.301-307
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• 1996

The purpose of this study was to evaluate the effect of surface treatment of porcelain on tensile bond strength. To accomplish this purpose, this study was carried out with 120 samples which were divided into 12 groups with each 10 samples, and the first group was not surface treated, groups 2 through 5 underwent single surface treatment, and groups 6 through 12 underwent compound surface treatment. The results were as follows : 1. In statistic, all the single surface-treated groups showed higher tensile bond strength than the non surface-treated group and the sandblasted group showed the highest tensile bond strength as $10.34{\pm}2.50MPa$. 2. All the compound surface-treated groups showed no noticeable difference in the tensile bond strength(9-11.5MPa). 3. In statistic, no significant difference was found between the sandblasted group and the compound surface-treated groups. 4. There was no fracture of porcelain while testing in this study. Above study demonstrated that compound surface treatment or sandblasing, if used single surface treatment, should be employed to guarantee successful clinical application.

• Korean Journal of Materials Research
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• v.9 no.7
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• pp.724-734
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• 1999

The adhesion characteristics of the thermoplastic resins such as PE, PP PVC, PET and PS were investigated on the surfaces of conventional steel (SS41), steel (SS41P) treated with ultrasonic waves and the SS41P coated with several ceramic powders (SS41PC) by the plasma spray. Alumina (Al$_2$O$_3$), alumina titania (Al$_2$O$_3$95%, TiO$_2$ 5%) and zirconia yttria (ZrO$_2$ 95%, $Y_2$O$_3$5% ) were used for the materials plasma spray The morphologies, surface hardness, surface roughness, and contact angles on SS41, SS41P, and SS41PC were examined. The tensile shear strength and peel strength of the polymers which were attached to the surfaces of ceramics coated on SS41P also were measured. The tensile shear strength and peel strength of polymers adhered to ceramic surface coated on steel were found to be stronger than those of conventional steel. The tensile shear strength and peel strength of the polymers adhered on the surfaces of ceramics coated steel increased in the following order PE > PET > PP > PS > PVC. The high adhesion strength of PE may be attributed to the surface roughness and its anchor effect on the ceramic surface.

• Composites Research
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• v.23 no.5
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• pp.1-7
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• 2010

To increase the adhesive strength of acrylonitrile butadiene rubber(NBR) and steel plate, the atmospheric pressure flame plasma(APFP) treatment device is applied. The effect of various conditions(processing velocity and distance) is experimentally investigated to ascertain the optimum conditions to yield the best adhesive properties. It is found that the optimum distance between burner port and steel plate is 40mm and the optimum processing velocity is 50m/min at given condition. When the surface is coated twice with the bonding agent, the adhesion strength of APFP treated steel plate is increased to about 20.5%. It suggests that the surface modification of steel by flame plasma treatment at atmospheric pressure is a proper and applicable method to improve the adhesion strength between steel and rubber.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.56.2-56.2
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• 2011

최근 철강, 알루미늄, 이종재료의 접합 등 용접이 어려운 부분에 구조용 접착제의 적용이 증가하고 있는 추세이다. 이를 위해 변성 에폭시레진을 활용한 고접합 강도, 고인성의 구조용 접착제가 연구되어 지고 있다. 피착제의 표면처리는 접합부의 접합강도를 향상시키는 방법으로 알려져 있으나 최근의 구조용 접착제는 표면 전처리 없이도 우수한 접착 특성을 보이는 것으로 기대되고 있다. 본 연구에서는 변성레진에 대해서 각종 표면처리가 접합부 특성에 미치는 영향을 조사하였다. 피착제로는 자동차용 냉연강판인 SPRC440을 사용하였고, 전처리로는 무처리 상태, SiC연마지를 이용한 연마, 아르곤 및 산소가스를 이용한 마이크로웨이브 플라즈마 표면처리, 산세 등의 표면처리를 실시하였다. 에폭시 접착제는 변성 에폭시 레진과 경화제 및 촉매제를 이용하여 직접 포뮬레이션하였다. 단일 겹치기 전단강도 시험과 T-Peel 시험은 각각 ASTM D 1002 규격에 따라 준비하였으며 인장 시험 후 파면은 SEM으로 관찰하였다.

• The korean journal of orthodontics
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• v.28 no.5 s.70
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• pp.803-812
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• 1998

The purpose of this study was to evaluate the shear bond strength and failure mode of ceramic brackets according to the surface treatment of porcelain. Sixty Porcelain samples were randomly divided into six groups of ten samples. Then they were treated as follows: Group 1(silane only), Group 2(etching+silane), Group 3(stone+silane), Group 4(sandblasting+silane), Group 5(stone +etching+silane), Group 6(sandblasting+etching+silane) After surface treatment of porcelain, sixty Transcend 6000 brackets were bonded to the prepared porcelain surface and they were stored in $37^{\circ}C$ saline for 24 hours. An Instron universal testing machine was used to test the shear bond strength of ceramic brackets to porcelain. After debonding, bases of ceramic brackets and porcelain surfaces were examined under scanning electron microscope(SEM) to determine failure mode. Statistical analysis of the data was carried out with one-way ANOVA and Duncan's multiple range test. The results were as follows : 1. The shear bond strength of surface-treated groups 2 to 6 was higher than that of only silane-treated group 1, and there was statistical significance. (P<0.05) 2. There was no significant difference among the groups 3 to 6. (P>0.05) 3. The shear bond strength of etching-surface treated group 2 was significantly lower than those of sandblasting-surface treated group 4, complex surface treated group 5 and group 6. 4. According to the scanning electromicroscopic images, the surface roughness of sandblasting-surface treated group 4 was less than those of the group 5 and 6, but there was no significant difference in the shear bond strength. (P>0.05) As a conclusion we can have a clinically adequate bond strength when an application of silane is done after the treatment of porcelain surface with more than one way to bond ceramic bracket on the porcelain. Also, it is considered that the sandblasting and application of silane is effective for the simplication and convenience of the treatment.

• Composites Research
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• v.31 no.1
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• pp.17-22
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• 2018

Long Fiber Prepreg Sheet (LFPS) has the advantages of excellent production efficiency and formability for complex shapes compared to conventional continuous fiber reinforced composites. When fibrous composites are used with different materials, joining method is important because strength of the joining part determines the strength of the hybrid structure. In this study, the adhesive joint strengths of co-cured LFPS and aluminum were evaluated under various surface treatment conditions and environmental conditions (temperature and moisture conditions). Mechanical abrasion and plasma exposure were used for the surface treatment. The adhesive joints experienced various surface treatments were tested by using single lap joint specimens. Adhesive strengths under various conditions were compared and the most appropriate condition was determined.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.340-340
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• 2015

상지 절단 장애인들을 위한 미관형 의수는 95% 이상의 시장 보급률을 보인다. 하지만 외부 형상 향상에만 연구 초점이 맞추어져 있어 많은 장애인들이 의수를 착용할 때 차가운 표면으로 인해 이질감을 느낀다. 이로 인해 의수 제작 업체 및 절단 장애인들은 착용 시 이질감이 적은 의수의 보급을 희망하고 있다. 그러므로 본 연구에서는 인체와 유사한 온도를 발생시켜 이질감을 감소시키는 의수를 개발하기 위해 유연 기판인 TPU (Temperature Polyurethane)와 PET (Polyethylene terephthalate) 위에 상용 silver nano paste를 3D 프린터로 인쇄하였으며, UV 표면처리를 사용하여 단시간 내에 낮은 저항과, 높은 회로 접착강도를 갖는 회로를 개발 하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.04b
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• pp.59-60
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• 2009

PAI-CS 나노하이브리드 절연코팅의 표면접착과 기계적 강도 및 내아크 내구성에 대하여 실험 분석하였다. 졸-겔법으로 PAI의 강화입자로 선택한 나노 CS는 메트릭스 수지와의 상안정성이 잘 이루어졌다. 나노경도를 측정한 결과 순수 PAI수지와 비교하여 CS첨가량이 증가함에 따라 경도와 탄성율 그리고 강성이 개선되고 있다. 한편 실란처리 방법에 따라 경 도와 탄성율의 개선폭이 달라지는 경향이 있어 제조시 적절한 실란처리에 의한 표면제어가 필요한 것으로 나타났다. 전기적 표면 내아크시험에서 순수 수지와 비교하여 우수한 내구성을 가지고 있어서 이는 서지와 부분방전 등에 노출되는 전력용 절연 코팅으로 사용이 기대된다.