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Surface structure relaxation of poly(methyl methacrylate)

TitleSurface structure relaxation of poly(methyl methacrylate)
Publication TypeJournal Article
Year of Publication2008
AuthorsLi, QF, Hua, R, Cheah, IJ, Chou, KC
JournalJournal of Physical Chemistry B
Date PublishedJan
ISBN Number1520-6106

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.

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