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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Solvent transport through hard-soft segmented polymer nanocomposites.

Sangram K Rath¹, Saji S Edatholath², T Umasankar Patro³

¹Naval Materials Research Laboratory, Shil-Badlapur Road, Ambernath, Maharashtra 421506, India.

Physical Chemistry Chemical Physics : PCCP

|January 5, 2016

Summary

Solvent transport in polyurethane nanocomposites showed non-monotonic diffusivity, defying traditional models. Nanoscale fillers alter polymer morphology, influencing solvent diffusion in complex ways.

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Understanding solvent transport in polymers is crucial for material design.
Polyurethane nanocomposites offer tunable properties but their transport behavior is complex.
Classical theories predict monotonic changes in diffusivity with filler content.

Purpose of the Study:

Investigate toluene transport in segmented polyurethane-clay nanocomposites.
Analyze the relationship between filler concentration and solvent diffusivity.
Elucidate the role of filler-induced morphological changes on solvent transport.

Main Methods:

Transport studies using toluene as a solvent.
Measurement of solvent diffusivity and equilibrium swelling.
Pre- and post-swollen segmented phase analysis of polymer nanocomposites.
Comparison of experimental data with classical tortuous path theory and free volume measurements.

Main Results:

Observed non-monotonic solvent diffusivity with increasing clay volume fraction.
Significant deviations between experimental and theoretically estimated diffusivity.
No change in equilibrium swelling (solubility coefficient) with filler content.
Identified filler-altered hard-soft segmented morphology influencing solvent interaction.

Conclusions:

Nanoscale fillers exert non-barrier influences on solvent diffusivity in phase-segmented block copolymers.
Filler concentration significantly affects the spatial distribution and reorientation of polymer segments upon solvent interaction.
Postulated a mechanism where filler-induced thermodynamic phase separation drives non-monotonic solvent transport behavior.