2nd Place, 92nd Annual Meeting, Oct 2021, Bangor - Carina Martinez Narvaez
2nd Place, 92nd Annual Meeting, Oct 2021, Bangor
Extensional rheology, pinching dynamics, and processability of polymer solutions Carina Martinez Narvaez and Vivek Sharma
Chemical Engineering, University of Illinois at Chicago, Chicago, IL
Paper Number
PO70
Session
Poster Session
Title
Extensional rheology, pinching dynamics, and processability of polymer solutions
Presentation Date and Time
October 13, 2021 (Wednesday) 6:30
Track / Room
Poster Session / Ballroom 1-2-3-4
Authors (Click on name to view author profile)
Author and Affiliation Lines (in printed abstract book)
Carina Martinez Narvaez and Vivek Sharma
Chemical Engineering, University of Illinois at Chicago, Chicago, IL 60607
Speaker / Presenter
Martinez Narvaez, Carina
Keywords
experimental methods; applied rheology; micelles; polymer solutions; rheology methods; surfactants; suspensions
Text of Abstract
The processability of polymer solutions is determined by the shear and extensional rheology response, pinching dynamics, and interfacial properties. Particularly, dispensing, and liquid transfer to substrates by dripping, jetting, spraying, or coating flows involve capillarity-driven pinching of liquid necks with strong extensional flows. However, due to a lack of suitable techniques, the extensional rheology response of polymeric complex fluids with low viscosity and low elasticity that are industrially relevant in a vast variety of formulations, has not been characterized in adequate detail. In this study, we examine how pinching and interfacial dynamics and the shear and extensional rheological response of polymer solutions are modified by the addition of ionic surfactants and particles or additional interactions. We utilize dripping-onto-substrate rheometry protocols and show that shear and extensional rheology response display contrasting concentration-dependent variation. We elucidate the effect of multiple interactions on the pinching dynamics and extensional rheology response, and we discuss the implications for dispensing of macromolecular complex fluids.