Redefining Solvent Resistance: The Dominant Role of Solvent-Surface Interactions in Nanoconfined Polymers

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polymer-based materials often exhibit poor solvent resistance, leading to swelling, deformation, and dissolution.
• Existing materials struggle to maintain integrity when exposed to aggressive solvents.

Purpose of the Study:

• To enhance the solvent resistance of polymer materials.
• To investigate the role of nanoparticle-solvent interactions in polymer retention within nanocomposites.

Main Methods:

• Infiltrating polymers into the interstices of densely packed nanoparticles.
• Analyzing polymer removal based on polymer-solvent and solvent-nanoparticle interactions.
• Tuning nanoparticle surface chemistry, confinement scale, and polymer identity.

Main Results:

• Polymer nanocomposites (PINFs) demonstrated dramatically enhanced solvent resistance, even against good solvents.
• Solvent-nanoparticle interactions were found to be crucial in displacing adsorbed polymer chains.
• Stronger solvent affinity for the nanoparticle surface facilitated polymer displacement, overriding polymer-solvent thermodynamics.

Conclusions:

• Solvent-surface interactions are a critical, overlooked parameter for engineering robust polymer nanocomposites.
• The interplay of polymer adsorption, confinement, and solvent-surface affinity governs solvent resistance.
• This approach enables the creation of polymer nanocomposites that retain polymer content under harsh solvent exposure.