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Relaxation behavior of poly(methyl methacrylate) at a water interface
Yoshihisa Fujii1, Toshihiko Nagamura, Keiji Tanaka
1Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan.
The Journal of Physical Chemistry. B
|February 25, 2010
Summary
Water plasticizes poly(methyl methacrylate) (PMMA) at the interface, lowering its glass transition temperature (Tg). This plasticization effect, driven by water content, impacts PMMA
Area of Science:
- Polymer Science
- Materials Science
- Surface Science
Background:
- Poly(methyl methacrylate) (PMMA) is a widely used polymer.
- Understanding polymer behavior at interfaces is crucial for material applications.
- Water's effect on polymer properties, especially at interfaces, requires detailed investigation.
Purpose of the Study:
- To investigate the relaxation behavior of PMMA at the water interface.
- To determine the influence of water on the glass transition temperature (Tg) of PMMA films.
- To elucidate the mechanisms behind Tg depression in PMMA at the water interface.
Main Methods:
- Spin-coating of PMMA on silicon wafers.
- Lateral Force Microscopy (LFM) for interfacial analysis.
- Variable temperature and scanning rate experiments.
Main Results:
- A distinct lateral force peak, attributed to water-plasticized segmental motion, was observed for PMMA in water.
- The apparent activation energy for the plasticized alpha-relaxation was significantly lower than for bulk or intact surface PMMA.
- A depth profile of Tg revealed a decrease in Tg with proximity to the water phase.
Conclusions:
- Water acts as a plasticizer for PMMA at the water interface.
- The observed Tg depression is primarily due to water content, not confinement effects.
- Interfacial water significantly alters the relaxation dynamics and thermal properties of PMMA.
