Title page for ETD etd-08262009-022444


Type of Document Master's Thesis
Author Agarwal, Neeraj
URN etd-08262009-022444
Title Transient Shear Flow Rheology of Concentrated Long Glass Fiber Suspensions in a Sliding Plate Rheometer
Degree Master of Science
Department Chemical Engineering
Advisory Committee
Advisor Name Title
Baird, Donald G. Committee Chair
Davis, Richey M. Committee Member
Wapperom, Peter Committee Member
Keywords
  • long glass fiber suspension
  • transient viscosity growth at startup of shear fl
  • Sliding plate rheometer
Date of Defense 2009-08-14
Availability unrestricted
Abstract
Transient viscosity growth measurements at the startup of shear flow were performed on long glass fiber-filled polypropylene. Samples were prepared with fibers pre-oriented either in 1-direction, 3-direction or random in 1-3 plane, where the 1-direction is the direction of shear motion, the 2-direction is perpendicular to the shear plane and the 3-direction is the neutral direction. A sliding plate rheometer incorporating a shear stress transducer was constructed in the lab. It was shown that this device works well for the tested materials including a Newtonian oil, a low density polyethylene (LDPE) and short glass fiber-filled polypropylene. The transient viscosity growth behavior for long glass fiber suspensions was subsequently investigated. The results suggested that both, fiber length and fiber concentration have pronounced effect on the steady state suspension viscosity. It was also observed that the transient behavior of the pre-oriented samples was highly dependent on the initial orientation state of the fibers.
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