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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Published on: January 26, 2016

Thickness induced structural changes in polystyrene films.

M K Mukhopadhyay¹, X Jiao, L B Lurio

¹Department of Physics, University of California San Diego, La Jolla, California 92093, USA.

Physical Review Letters

|October 15, 2008

Summary

This summary is machine-generated.

Polystyrene melt films show structural changes with thickness. Thinner films (below 4 times the polymer radius of gyration) exhibit increased compressibility due to reduced chain interpenetration.

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Area of Science:

Polymer Physics
Materials Science
Soft Matter Physics

Background:

Understanding polymer film structure is crucial for material properties.
Density fluctuations in polymer melts influence their behavior.
Film thickness significantly impacts polymer chain interactions.

Purpose of the Study:

To investigate structural changes in polystyrene melt films.
To correlate film thickness with density fluctuations and compressibility.
To understand the role of chain interpenetration in thin polymer films.

Main Methods:

Small angle X-ray scattering (SAXS) was employed.
A standing wave geometry was utilized to probe film interiors.
Density fluctuations were analyzed as a function of film thickness.

Main Results:

Films thicker than 4 times the polymer radius of gyration (Rg) displayed bulk-like density fluctuations.
Thinner films showed a growing peak near q=0 in the scattering spectrum S(q) with decreasing thickness.
This phenomenon was linked to reduced chain interpenetration and enhanced compressibility.

Conclusions:

Film thickness below 4Rg alters polystyrene melt film structure.
Decreased chain interpenetration in thinner films leads to higher compressibility.
SAXS in a standing wave geometry is effective for studying film interior properties.