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Thermal analysis of adsorbed poly(methyl methacrylate) on silica

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Modulated differential scanning calorimetry has been used to quantify the glass transitions of small adsorbed amounts of poly(methyl methacrylate) (PMMA) on silica. While a relatively narrow, single glass transition was found for bulk PMMA, broader two-component transitions were found for the adsorbed polymer. A two-state model based on loosely bound polymer (glass transition similar to bulk) and more tightly bound polymer (glass transition centered around 156 °C) was used to interpret the thermograms. On the basis of this model, the amount of tightly bound polymer was found to be approximately 1.3 mg/m2, corresponding to a 1.1 nm thick layer. The change in heat capacity for the tightly bound polymer at the glass transition temperature was estimated to be about 16% of that of the bulk polymer.
OriginalsprogEngelsk
TidsskriftLangmuir
Vol/bind22
Udgave nummer10
Sider (fra-til)4741-4744
Antal sider4
ISSN0743-7463
DOI
StatusUdgivet - 7 apr. 2006
Eksternt udgivetJa

ID: 188394926