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High-temperature Adhesion Promoter Based on (3-Glycidoxypropyl) Trimethoxysilane for Cu Paste
Jianwei Jiang,구용환,Hye Won Kim,Ji Hyun Park,Hyun Suk Kang,이병철,김상호,송희은,Longhai Piao 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
To realize copper-based electrode materials for printed electronics applications, it is necessary to improve the adhesion strength between conductive lines and the substrate. Here, we report the preparation of Cu pastes using (3-glycidoxypropyl) trimethoxysilane (GPTMS) prepolymer as an adhesion promoter (AP). The Cu pastes were screen-printed on glass and polyimide (PI) substrates and sintered at high temperatures (> 250 oC) under a formic acid/N2 environment. According to the adhesion strengths and electrical conductivities of the sintered Cu films, the optimized Cu paste was composed of 1.0 wt % GPTMS prepolymer, 83.6 wt % Cu powder and 15.4 wt % vehicle. After sintering at 400 oC on a glass substrate and 275 oC on a PI substrate, the Cu films showed the sheet resistances of 10.0 mΩ/sq. and 5.2 mΩ/sq., respectively. Furthermore, the sintered Cu films exhibit excellent adhesion properties according to the results of the ASTM-D3359 standard test.
Hu Zhou,맹일호,구용환,김혜원,박지현,강현석,이병철,박용해,김상호 한국고분자학회 2013 Macromolecular Research Vol.21 No.11
The rheology of cellulose derivatives dissolved in highly viscous solvent was studied. Results demonstrated that a concentration-dependent transition occurred at ca. 10 vol% for ethyl cellulose, and at ca. 2.0 vol% for hydroxypropyl cellulose. Below the transition point, steady shear viscosity of solutions showed weak concentration dependency. The exponent of the power law model was about 3.7. Above the transition, the viscosity was strongly dependent on the concentration. Further studies showed that such a transition strongly depended on the association between chains. Above the transition point, their long-time dynamics were dominated by the hydrogen bonds acting as the transient cross-links between chains. While below this point, long-time dynamics were governed by the percolation statistics. As a result, their viscosities indicated different concentration dependence relationships. Our studies showed that the entanglement and association behaviors were different, for the flexible and semi-flexible chains.
Oligomer 특성에 따른 Touch Panel용 UV 경화형 Ag paste의 물성연구
남수용 ( Su Yong Nam ),구용환 ( Yong Hwan Koo ),김성빈 ( Sung Bin Kim ) 한국화상학회 2010 한국화상학회지 Vol.16 No.3
최근 전자 디스플레이에서 각광받고 있는 터치스크린은 급속한 정보화 사회 속에서 비약적인 발전을 거듭하고 있다. 터치패널은 키보드나 마우스와 같은 입력장치를 사용하지 않고, 화면에 나타난 문자나 특정위치에 사람의 손 또는 물체가 닿으면 그 위치를 파악하여 특정한 기능을 처리하도록 한 패널이다. 이러한 터치스크린에서의 터치패널용 Ag 페이스트는 대부분 열 경화형 페이스트를 사용하고 있다. 이러한 열 경화형 페이스트는 건조공정에 따른 열 에너지 소비와 유기용제에 따른 작업환경 개선의 문제점을 가지고 있다. 본 연구에서는 기존에 사용되는 열 경화형 Ag 페이스트가 아닌 친환경적이고 경제적인 UV 경화형 페이스트를 제조하였다. 현재 시판중인 열 경화형 바인더 대신 UV 경화형 올리고머를 사용하였고 유동특성을 부여하기 위해 단관능 모노머를 첨가하여 전도성 Ag paste 패턴형성을 할 수 있었다. 그 결과 열 경화형 Ag 페이스트만큼 접착력, 경도, 내성 등이 우수하였으며 미세패턴의 재현이 가능했으며 스크린 인쇄를 이용한 친 환경적인 패터닝 기술로서의 가능성을 확인할 수 있었다. The recent spotlight on electronic touch-screen display, a rapid breakthrough in the information society is evolving. Touch panel input device such as a keyboard or mouse without the use of, the on-screen character or a specific location or object on the person`s hand touches a particular feature to identify the location of a panel is to be handled. The touch screen on the touch panel is used in the Ag paste is used mostly for low-curable paste. The thermal-curing paste according to the drying process of thermal energy consumption and improve the working environment of organic solvents have problems. In this study, Ag paste used in the non-thermal curing friendly and cost-effective UV curable paste was prepared. Current commercially available thermal-curable binder, was used instead of the flow characteristics of UV-curable oligomers and monomers with functional groups to give a single conductive Ag paste with the addition of a pattern could be formed. Ag paste as a result, thermal-curing adhesive, hardness, resistance and excellent reproduction of fine patterns and was available with screen printing environmentally friendly could see its potential as a patterning technology.