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Dynamic structure factor for large aggregate clusters with internal motions: a self-consistent light-scattering study

Yu H Wen¹, Po C Lin, Chi C Hua

¹Department of Chemical Engineering, National Chung Cheng University, Chiayi, Taiwan, ROC.

The Journal of Physical Chemistry. B

|November 4, 2011

Summary

This study used light scattering to analyze poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) aggregation. Results reveal rigid-sphere morphology and suppressed segmental dynamics in MEH-PPV solutions.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Conjugated polymers like poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) are crucial for organic electronics.
Understanding their aggregation in solution is vital for optimizing thin-film properties.
MEH-PPV solutions present challenges due to broad size distributions and complex dynamics.

Purpose of the Study:

To unequivocally resolve the aggregation properties of MEH-PPV in chloroform and toluene.
To develop a robust method for analyzing dynamic light scattering (DLS) data from complex polymer solutions.
To characterize aggregate morphology, size distribution, aggregation number, and internal dynamics.

Main Methods:

Combined dynamic and static light scattering (DLS/SLS) techniques were employed.
A self-consistent formulation for DLS analysis was developed, extending bead-spring chain theory.
Rigid-sphere and Gaussian coil form factors were used to model aggregate structures.

Main Results:

Light scattering data strongly support a rigid-sphere form factor for MEH-PPV aggregates, contrasting with prior fractal models.
Aggregate morphology, size distribution, and mean aggregation numbers were determined.
Internal dynamics revealed significantly suppressed segmental motions compared to non-aggregated solutions.

Conclusions:

The study provides the first detailed characterization of MEH-PPV solution aggregation properties.
The findings offer crucial insights for linking solution behavior to thin-film performance in conjugated polymer applications.
The developed DLS analysis protocol is applicable to conventional light-scattering setups.