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In situ Structural Characterization of Semi-Crystalline Polymer Latex Particles by Small-Angle X-Ray Scattering

✍ Scribed by Joerg Bolze; Matthias Ballauff; Thorsten Rische; Daniel Rudhardt; Jürgen Meixner

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
188 KB
Volume
205
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: The inner structure of polyurethane latex particles has been studied in situ using small‐angle X‐ray scattering (SAXS). From contrast variation SAXS measurements evidence could be given that the dispersed particles are semi‐crystalline. The semi‐crystalline structure gives a strong contribution to the measured intensities in an intermediate range of scattering vectors. This contribution, which is independent of the adjusted contrast, could be separated and the long period of the lamellar structure could thus be determined quantitatively to 11 nm. In addition, it was found that the particles exhibit a core‐shell structure which arises from electron‐rich acid groups that are preferentially located at the particle surface.

Transmission electron microscopy (TEM) picture of the PUR particles.

imageTransmission electron microscopy (TEM) picture of the PUR particles.

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