Investigation of the three region flow curve of polymeric liquid crystals by rheo-optical methods.: An article from: Polymer Engineering and Science
Book Details
Author(s)Tadahiro Asada
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00092T3N4
ISBN-13978B00092T3N0
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on August 1, 1993. The length of the article is 2504 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Steady flow behavior of bulk liquid crystals and polymeric liquid crystals are summarized into a three region flow curve. Changes in the internal structure during deformation and flow were investigated by rheo-optical methods. Two different optical geometries were used. In one method, a light beam passed through perpendicular to the shear plate, and in the other method a light beam passed perpendicular to the edge of the lamina flow. The results indicate that the details of the internal texture do not necessarily appear in the rheological properties, such as viscosity, and that the molecular orientation mechanism under shear force is fundamentally different in a liquid crystal of rod-like molecules and a suspended solution of rod-like molecules. In the isotropic solution, the rod-like molecules float or are suspended in a solvent and are oriented by the flow field of the solvent fluid. However, in a liquid crystal, the torque propagates directly on the individual rod-like molecules, affecting their orientation. They flow as if it were a plastic solid.
Citation Details
Title: Investigation of the three region flow curve of polymeric liquid crystals by rheo-optical methods.
Author: Tadahiro Asada
Publication:Polymer Engineering and Science (Refereed)
Date: August 1, 1993
Publisher: Society of Plastics Engineers, Inc.
Volume: v33 Issue: n16 Page: p1022(5)
Distributed by Thomson Gale
From the author: Steady flow behavior of bulk liquid crystals and polymeric liquid crystals are summarized into a three region flow curve. Changes in the internal structure during deformation and flow were investigated by rheo-optical methods. Two different optical geometries were used. In one method, a light beam passed through perpendicular to the shear plate, and in the other method a light beam passed perpendicular to the edge of the lamina flow. The results indicate that the details of the internal texture do not necessarily appear in the rheological properties, such as viscosity, and that the molecular orientation mechanism under shear force is fundamentally different in a liquid crystal of rod-like molecules and a suspended solution of rod-like molecules. In the isotropic solution, the rod-like molecules float or are suspended in a solvent and are oriented by the flow field of the solvent fluid. However, in a liquid crystal, the torque propagates directly on the individual rod-like molecules, affecting their orientation. They flow as if it were a plastic solid.
Citation Details
Title: Investigation of the three region flow curve of polymeric liquid crystals by rheo-optical methods.
Author: Tadahiro Asada
Publication:Polymer Engineering and Science (Refereed)
Date: August 1, 1993
Publisher: Society of Plastics Engineers, Inc.
Volume: v33 Issue: n16 Page: p1022(5)
Distributed by Thomson Gale
