Abstract/Details

Full tensor optical rheometry: Dynamics of flowing polymers in three -dimensional space


2000 2000

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Abstract (summary)

Control of material structure during processing is essential for the production of high performance parts. Polymeric materials are rheologically complex and flows during processing cause complex fluctuation in the molecular orientation, thus modifying the properties of the final product. The relationship between processing, rheology and the development of structure and phase separation, particularly for complex polymer systems such as blends, solutions and composites, is not fully understood.

Over the past few decades flow birefringence experiments have proven an increasingly valuable tool for determining the rheology and structure of flowing polymer systems. Birefringence measures the degree of extension and orientation of polymer molecules. By the use of the stress-optical rule, birefringence can also measure components of the stress tensor.

Initially, flow birefringence experiments were limited to steady-state measurements. This was due to the fact that birefringence experiments were incapable of measuring both the birefringence and angle of orientation of the polymers simultaneously. With the development of light-modulation techniques time-dependent measurements were possible. Conventionally, birefringence measurement techniques used a single probing laser beam, thus limiting measurements of polymer conformation to two-dimensional space.

The objective of this project is to determine the real-time, three-dimensional, full stress tensor by developing the Full Tensor Optical Rheometry (FTOR) technique. This technique utilizes three phase-modulated laser beams that impinge on the sample along three independent directions. Information about the molecular orientation in three-dimensions is measured and through appropriate geometric transformations the decoupling of this information yields the full conformation tensor.

Indexing (details)


Subject
Chemical engineering;
Plastics
Classification
0542: Chemical engineering
0795: Plastics
Identifier / keyword
Applied sciences, Flowing polymers, Optical rheometry, Polystyrene, Three-dimensional space
Title
Full tensor optical rheometry: Dynamics of flowing polymers in three -dimensional space
Author
Kalogrianitis, Socratis
Number of pages
111
Publication year
2000
Degree date
2000
School code
0118
Source
DAI-B 61/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599645691, 0599645695
Advisor
Egmond, Jan van
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9960763
ProQuest document ID
304606740
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304606740
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