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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

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Surface engineering of mixed conjugated/polyelectrolyte brushes - Tailoring interface structure and electrical

Karol Wolski¹, Joanna Smenda¹, Anna Grobelny¹

¹Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Krakow, Poland.

Journal of Colloid and Interface Science

|December 19, 2022

Summary

Researchers developed a new method to create mixed polymer brushes (MPBs) with tunable properties. Conjugated polymer brushes reduced nanophase separation, enabling applications in smart surfaces and memristive devices.

Keywords:

Conductivity Conjugated polymers Controlled radical polymerizations Memristive effect Mixed polymer brushes Poly(sodium 4-styrenesulfonate)Surface dynamics

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Area of Science:

Polymer Science
Materials Science
Surface Chemistry

Background:

Mixed polymer brushes (MPBs) offer tunable surface properties through controlled chain architecture.
Synthesizing MPBs involves surface dilution and grafting, influencing nanophase separation and dynamics.
Polyelectrolyte and conjugated chains synergistically enhance coating characteristics.

Purpose of the Study:

To develop a spatially controlled synthesis of mixed conjugated/polyelectrolyte brushes.
To investigate the nanophase separation and surface dynamics of these MPBs.
To explore their potential in smart surfaces and memristive devices.

Main Methods:

Surface-initiated polymerizations for spatially controlled grafting of poly(sodium 4-styrenesulfonate) (PSSNa) and poly(3-methylthienyl methacrylate) (PMTM) brushes.
Template polymerization to create conjugated PMTM chains within the MPB structure.
Nanoscale resolution IR imaging, SIMS profiling, and AFM mapping to analyze surface dynamics and nanophase separation in selective solvents.

Main Results:

Unconjugated MPBs exhibited vertical and horizontal nanophase separation, influenced by chain ratios and lengths.
Conjugated MPBs showed diminished nanophase separation due to enhanced interactions between conjugated PMTM and PSSNa chains (macromolecular mixing).
The resulting systems displayed tunable interfacial structures and resistance switching properties.

Conclusions:

A novel synthetic strategy enables precise control over mixed polymer brush composition and architecture.
Conjugation significantly alters nanophase separation, leading to macromolecular mixing.
These tailored MPBs are promising for advanced applications like smart surfaces and memristive devices.