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Exploiting Reactor Geometry to Manipulate the Properties of Plasma Polymerized Acrylic Acid Films
Karyn Jarvis1, Sally McArthur2,3
1ANFF-Vic Biointerface Engineering Hub, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia. kljarvis@swin.edu.au.
Reactor geometry significantly impacts plasma polymerized acrylic acid (ppAAc) film properties. Optimizing electrode placement in plasma reactors is crucial for tailoring film characteristics like thickness and stability.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Engineering
Background:
- Plasma polymerization offers a versatile method for creating functional polymer films.
- Reactor design and electrode configuration critically influence plasma characteristics and film properties.
Purpose of the Study:
- To investigate the effect of electrode geometry and distance on plasma polymerized acrylic acid (ppAAc) film properties.
- To demonstrate how reactor configuration can be optimized to tailor ppAAc film characteristics.
Main Methods:
- Plasma polymerization of acrylic acid in a custom T-shaped reactor.
- Varied internal electrode geometries (parallel and perpendicular) and distances.
- Surface chemistry analysis using X-ray photoelectron spectroscopy (XPS).
- Film thickness and aqueous stability assessed via spectroscopic ellipsometry and immersion tests.
Main Results:
- Perpendicular electrode: increased distance led to decreased film thickness and aqueous stability, but increased COOH/R group concentration due to reduced fragmentation.
- Parallel electrode: resulted in thicker films with lower COOH/R group concentration and enhanced aqueous stability compared to perpendicular at similar distances.
- Electrode position and distance demonstrably altered ppAAc film properties.
Conclusions:
- Reactor geometry is a key factor in controlling plasma polymerization outcomes.
- Well-characterized plasma reactors and strategic electrode placement enable precise tailoring of functional polymer film properties.
- This study highlights the importance of reactor design for reproducible and specific film deposition.
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