|Title||Surface structure relaxation of poly(methyl methacrylate)|
|Publication Type||Journal Article|
|Year of Publication||2008|
|Authors||Li, QF, Hua, R, Cheah, IJ, Chou, KC|
|Journal||Journal of Physical Chemistry B|
Surface structure relaxations caused by temperature changes at the free surface of poly(methyl methacrylate) were studied using IR-visible sum-frequency generation (SFG). A polarization-rotating technique was introduced to enhance the sensitivity of SFG for monitoring the surface structure relaxations during a cooling process. A new surface structure relaxation was observed at 67 degrees C. This temperature does not match any known structure relaxation temperatures for the bulk and is 40 degrees C below the bulk glass transition temperature. As expected for a free-surface phenomenon, the surface relaxation temperature was found to be independent of film thickness in the range of 0.1-0.5 mu m.
|URL||<Go to ISI>://000252484200005|