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Apparatus for Simultaneous Small Angle Neutron Scattering and Steady Shear Viscosity Studies of Polymer Melts and Solutions.

Authors
  • Nakatani, Alan I1
  • Kim, Hongdoo1
  • Han, Charles C1
  • 1 National Institute of Standards and Technology, Gaithersburg, MD 20899.
Type
Published Article
Journal
Journal of research of the National Institute of Standards and Technology
Publication Date
Jan 01, 1990
Volume
95
Issue
1
Pages
7–14
Identifiers
DOI: 10.6028/jres.095.003
PMID: 28179754
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The design and construction of an apparatus for studying the simultaneous small angle neutron scattering (SANS) and steady shear viscosity behavior of polymer melts and concentrated solutions is discussed. Successful operation of the device is demonstrated on a blend of 20 weight percent deuterated polystyrene and 80 weight percent poly(vinylmethylether). The effects of shear on the critical behavior of the blend are observed in the SANS behavior as a function of temperature and shear rate and indicate shear induced mixing behavior for the range of shear rates examined. The steady shear viscosity results alone are insufficient for detecting the transition from one to two phases. The examination of shear effects in polymer blends is important for understanding the critical behavior of binary systems. Technologically, knowledge of the phase behavior of polymer blends under shear are important for the design and improvement of commercial blend processing.

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