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http://dx.doi.org/10.9725/kstle.2009.25.2.086

Effect of Temperature on the Micro-scale Adhesion Behavior of Thermoplastic Polymer Film  

Kim, Kwang-Seop (Nano-Mechanical systems Research Division, KIMM)
Heo, Jung-Chul (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Kim, Kyung-Woong (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Publication Information
Tribology and Lubricants / v.25, no.2, 2009 , pp. 86-95 More about this Journal
Abstract
Adhesion tests were carried out in order to investigate the effect of temperature on the adhesion behavior between a PMMA film and a fused silica lens in the micro scale. For the tests, a microtribometer system was specially designed and constructed. The pull-off forces on the PMMA film were measured under atmospheric condition as the temperature of the PMMA film was increased from 300 K to 443 K and decreased to 300 K. The contact area between the PMMA film and the lens was observed during the test. The adhesion behavior was changed with the change of the PMMA surface state as the temperature increased. In glassy state below 363 K, the pull-off force did not change with the increase of temperature. In rubbery state from 383 K to 413 K, the pull-off force increased greatly as the temperature increased. In addition, the area of contact was enlarged. In viscous state above 423 K, the fingering instability was observed in the area of contact when the PMMA film contacted with the lens. It was also found that the adhesion behavior can be varied with the thermal history of the PMMA film. The residual solvent in the PMMA film could emerge to the PMMA surface due to the heating and reduced the pull-off force.
Keywords
adhesion; thermoplastic polymer film; thermal effect; microtribometer;
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