(33a) Mitigation of Hysteresis in High Solids Content Polymers Using Photorheometry
AIChE Annual Meeting
2021
2021 Annual Meeting
Materials Engineering and Sciences Division
Polymer Viscoelasticity: Mechanics, Processing, and Rheology
Sunday, November 7, 2021 - 3:30pm to 3:45pm
This work highlights the use of oscillatory photorheometry to analyze the role that an in-situ UV cure can play in quickly restoring a materialâs interparticle network after subjection to high levels of stress. The research focuses primarily on how loading level, distribution, and transparency of fillers can contribute to thixotropy and hysteresis, specifically when an in-situ UV cure is applied to encourage network reformation. This is accomplished through a three-interval thixotropy test, where 1) a low stress time sweep is conducted to gather low-strain data, 2) high stress time sweep data is gathered until a new equilibrium is reached, and finally 3) UV is optionally turned on while baseline, low stress data is gathered again. Comparison of the third step with and without UV exposure allows conclusions to be drawn about how hysteresis of a highly filled system post-extrusion can be mitigated using varying intensities of UV light.