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)

1. Martinez Narvaez, Carina (University of Illinois at Chicago, Chemical Engineering)
2. Sharma, Vivek (University of Illinois at Chicago, Chemical Engineering)

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.