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Early stages of polymer interdiffusion.

E Sivaniah¹, R A L Jones, M Sferrazza

¹Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 6, 2003

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We studied polymer diffusion using neutron reflectivity, finding the diffusion coefficient is independent of sample position. This allowed us to model the polymer interface structure.

Area of Science:

Materials Science
Polymer Physics
Neutron Scattering

Background:

Understanding polymer diffusion is crucial for material properties.
Multilayer polymer systems offer unique diffusion dynamics.

Purpose of the Study:

To investigate the wavelength dependence of the diffusion coefficient in a polymer multilayer system.
To analyze the interface broadening in deuterated polystyrene-hydrogenated polystyrene bilayers.

Main Methods:

Neutron reflectivity measurements were employed.
The decay of the Bragg peak was monitored in detail.

Main Results:

The diffusion coefficient (D(k)) showed no spatial dependence on the distance from the substrate.

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The interface broadening was successfully reconstructed, exhibiting both a diffuse tail and a sharp core.

Conclusions:

The diffusion process in this polymer system is spatially uniform.
The reconstructed interface provides insights into polymer blending and morphology.