Behavior of Deformed Droplets in an Immiscible Polymer Blend: A Comparative Study of Electron Microscopy and Small-Angle X-Ray Scattering

✍ Scribed by Zdeněk Starý; Josef Baldrian; Hana Stará

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 645 KB
• Volume: 294
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200900145

✦ Synopsis

Abstract

The deformation of dispersed droplets in a PS/LLDPE 95:5 blend during uniaxial elongation and after cessation of the flow was studied. The behavior of the dispersed droplets during elongation is in a good agreement with a prediction of the modified capillary number model using transient elongational viscosities. The phase structure changes after the elongation was studied in relaxation and recovery modes. The morphology was investigated using scanning electron microscopy and small‐angle X‐ray scattering. Thus the dimensions of the dispersed particles and their degree of orientation were estimated. It was shown that the SAXS as an integral method gives new additional information which is hardly accessible by SEM as a method providing local information about discrete locations in the sample. The results of both methods proved that the stress in the sample is a decisive parameter determining the morphology development after cessation of the flow.

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