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- 저자 : Yasuhisa Ando (검색결과 5 건)
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원자간힘 현미경을 이용한 폴리머 박막의 트라이볼로지 특성에 대한 온도의 영향
김광섭(Kwang-Seop Kim),Yasuhisa Ando,김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6
In this study, adhesion and friction tests were carried out in order to investigate the effect of temperature on the tribological characteristics of poly(methyl methacrylate)(PMMA) film using atomic force microscope. The pull-off and friction forces on PMMA film were measured under high vacuum condition (below 1 × 10?⁴ Pa) at various temperatures in the range from 300 K to 420 K. Friction tests also were conducted under high vacuum and atmospheric condition at room temperature. The surface properties of PMMA film was changed suddenly at 420 K, higher 50 K than the Tg of PMMA. Subsequently, the pull-off force increased and was proportional to the maximum applied load at 420 K while it did not depend on the maximum applied load at below 395 K. The friction force started to increase at 370 K and increased greatly at 420 K. In addition, from force-displacement curves, it was observed that the stiffness of PMMA film decreased and the plastic deformation was generated at only 420 K. After the heating of PMMA film up to 420 K, the friction and pull-off forces decreased generally. The RMS roughness was increased and the friction coefficient in atmospheric condition was decreased as well. As a result, it was found that the temperature affected greatly the tribological characteristics of PMMA, especially, at high temperature where PMMA film became soft enough. In addition, the surface property of PMMA film can be changed by the heating and the change affected strongly the tribological characteristics of PMMA film.
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Kim, Kwang-Seop,Ando, Yasuhisa,Kim, Kyung-Woong IOP Pub 2008 Nanotechnology Vol.19 No.10
<P>Adhesion and friction tests were carried out in order to investigate the effect of temperature on the tribological characteristics of poly(methylmethacrylate) (PMMA) film using AFM. The pull-off and friction forces on the PMMA film were measured under a high vacuum condition (below 1 × 10<SUP>−4</SUP> Pa) as the temperature of the PMMA film was increased from 300 to 420 K (heating) and decreased to 300 K (cooling). Friction tests were also conducted in both high vacuum and air conditions at room temperature. When the temperature was 420 K, which is 25 K higher than the glass-transition temperature (<I>T</I><SUB>g</SUB>) of PMMA, the PMMA film surface became deformable. Subsequently, the pull-off force increased in proportion to the maximum applied load during the pull-off force measurement. In contrast, when the temperature was under 395 K, the pull-off force did not depend on the maximum applied load. The friction force began to increase when the temperature rose above 370 K, which is 25 K lower than the <I>T</I><SUB>g</SUB> of PMMA, and rapidly increased at 420 K. Decrease of the PMMA film stiffness and plastic deformation of the PMMA film were observed at 420 K in force–displacement curves. After the heating to 420 K, the coefficient of friction was measured under air condition at room temperature and was found to be lower than that measured before the heating. Additionally, the RMS roughness increased as a result of heating.</P>
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열가소성 폴리머 필름의 나노 응착 및 마찰 거동에 대한 온도의 영향
김광섭(Kwang-Seop Kim),安藤泰久(Yasuhisa Ando),김경웅(Kyung-Woong Kim) 한국트라이볼로지학회 2007 한국윤활학회지(윤활학회지) Vol.23 No.6
Adhesion and friction tests were carried out in order to investigate the effect of temperature on the tribological characteristics of poly (methylmethacrylate) (PMMA) film using AFM. The pull-off and friction forces on the PMMA film were measured under a high vacuum condition (below 1×10?⁴ Pa) as the temperature of the PMMA film was increased from 300 K to 420 K (heating) and decreased to 300K (cooling). Friction tests were also conducted in both high vacuum and air conditions at room temperature. When the temperature was 420 K, which is 25 K higher than the glass transition temperature (Tg) of PMMA, the PMMA film surface became deformable. Subsequently, the pull-off force was proportional to the maximum applied load during the pull-off force measurement. In contrast, when the temperature was under 395 K, the pull-off force showed no correlation to the maximum applied load. The friction force began to increase when the temperature rose above 370 K, which is 25 K lower than the Tg of PMMA, and rapidly increased at 420 K. Decrease of the PMMA film stiffness and plastic deformation of the PMMA film were observed at 420 K in force-displacement curves. After the heating to 420 K, the fiction coefficient was measured under the air condition at room temperature and was found to be lower than that measured before the heating. Additionally, the RMS roughness increased as a result of the heating.
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