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13:57
Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
Published on: December 24, 2014
Transient interfacial tension of partially miscible polymers
C Tufano1, G W M Peters, P D Anderson
1Eindhoven University of Technology, Department of Mechanical Engineering, Eindhoven, The Netherlands.
Journal of Colloid and Interface Science
|July 4, 2008
Summary
Interfacial tension in polymer blends changes over time due to component migration, indicating partial immiscibility. Models were developed to explain these dynamic changes and diffusion processes.
Area of Science:
- Polymer Science
- Materials Science
- Physical Chemistry
Background:
- Binary polymer blends are crucial in materials science, but their interfacial properties dictate blend performance.
- Understanding interfacial tension dynamics is key to predicting blend morphology and stability.
- Previous studies often assumed complete immiscibility, neglecting time-dependent interfacial phenomena.
Purpose of the Study:
- To measure and analyze the time-dependent interfacial tension of polybutene (PB)/polydimethylsiloxane (PDMS) blends.
- To investigate the influence of molecular weight, polydispersity, and temperature on interfacial tension dynamics.
- To develop and validate models explaining the diffusion and migration mechanisms governing interfacial tension changes.
Main Methods:
- Interfacial tension measurements using a pendent drop apparatus at temperatures from 24°C to 80°C.
- Utilized three grades of polybutene (PB) with varying molecular weights and polydispersities against a polydimethylsiloxane (PDMS) continuous phase.
- Applied continuous and discrete diffusion models to interpret experimental results, considering interphase thickness variations.
Main Results:
- Interfacial tension was found to change with time, confirming partial immiscibility in the studied polymer blends.
- Changes were attributed to the migration of low-molecular-weight components, leading to an initial decrease and subsequent increase in interfacial tension.
- Time to reach stationary interfacial tension increased with molecular weight and temperature; higher polydispersity reduced stationary tension and its temperature dependence.
Conclusions:
- The dynamic interfacial tension behavior is governed by diffusion and migration of low-molecular-weight species.
- Developed models accurately describe the time-dependent interfacial tension and provide insights into diffusion time scales.
- The study provides a framework for understanding and predicting interfacial behavior in partially immiscible polymer blends.
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