Shear-induced orientation and yielding of Cellulose nanocrystal suspensions: A Rheo-PLI study
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Type
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Model builders
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Abstract
This thesis presents an investigation of the shear-induced orientation and yielding
behavior of CNC water suspensions by employing a Rheo-PLI technique. Cellulose
is a structural protein found in plants and algae and plants produce them through
synthesis.CNC has demonstrated potential in numerous applications due to its properties
such as high mechanical strength, higher crystallinity, high aspect ratio, and
optical properties. They are usually using in automotive industries,pharmaceutical
industry, reinforcements in fillers and much more.The orientation and its microstructure
highly impact to optical and mechanical properties. This study includes the
preparation of CNC suspensions and analyze their rheological properties from rheological
tests combined with polarized light imaging. In this study we combined the
rheological tests with the polarized light imaging technique inorder to examine the
yielding and shear-induced orientation of CNC structures in their suspension. We
have performed hysteresis loop tests to investigate the thixotropic behavior, oscillatory
tests to analyze the viscoelastic behavior, creep tests to examine the stability
of CNC suspensions, and Yield stress to determine yielding behavior
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Keywords
CNC, Rheo- PLI, Shear Orientation, Yielding behavior of CNC, Viscoelasticity