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Transition Temperature of Poly(methyl methacrylate) Determined by Time-of-Flight Secondary Ion Mass Spectrometry and Contact Angle Measurements

Authors Fu, Yi HKUST affiliated (currently or previously).
Lau, Richard Yiu Ting HKUST affiliated (currently or previously)
Weng, Lutao HKUST affiliated (currently or previously)
Ng, Kai Mo HKUST affiliated (currently or previously)
Chan, Chi Ming View this author's profile
Issue Date 2017
Source Journal of Colloid and Interface Science , v. 504, October 2017, p. 758-764
Summary The surface chain conformations of poly(methyl methacrylate) (PMMA) at different temperatures were extensively studied by time-of-flight secondary ion mass spectrometry (ToF-SIMS). Similar to our previous experimental studies on polystyrene (PS) and poly(2, 3, 4, 5, 6-pentafluorostyrene) (5FPS), a transition temperature (TT) could be identified through the principal component analysis (PCA) of the ToF-SIMS spectra obtained from the PMMA samples annealed at different temperatures. Interestingly, our results show that the TT depended on molecular weight and was about 50–60˚C below the bulk glass transition temperature (Tg) and therefore could possibly be related to the surface glass transition temperature (Tg S). These results were confirmed by contact angle measurements. ToF-SIMS results showed higher peak intensities of several low-mass oxygen-containing positive ions, hydrocarbon positive ions and OCH3 − negative ion at higher temperatures, which can be interpreted by a higher surface concentration of methoxy groups at the surface. © 2017 Elsevier Inc.
ISSN 0021-9797
Language English
Format Article
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