Paper Number
PO83
Session
Poster Session
Title
Understanding DIW “printability” in terms of recovery rheology
Presentation Date and Time
October 12, 2022 (Wednesday) 6:30
Track / Room
Poster Session / Riverwalk A
Authors
- Shi, Jiachun (University of Illinois Urbana-Champaign, Department of Chemical and Biomolecular Engineering)
- Kamble, Yash (University of Illinois Urbana-Champaign, Chemical and Biomolecular Engineering)
- Guironnet, Damien (University of Illinois Urbana-Champaign, Chemical and Biomolecular Engineering)
- Rogers, Simon A. (University of Illinois at Urbana-Champaign, Department of Chemical and Biomolecular Engineering)
Author and Affiliation Lines
Jiachun Shi, Yash Kamble, Damien Guironnet and Simon A. Rogers
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Speaker / Presenter
Shi, Jiachun
Keywords
experimental methods; theoretical methods; additive manufacturing; jammed systems; polymer solutions
Text of Abstract
Direct ink writing is a 3-D printing technology that has received increasing attention in recent years due to its low cost, energy-efficient, and design freedom. However, few detailed rheological characterizations are used for evaluating the concept of printability of ink formulation and the usage of the term itself. In the present work, we use a yield stress material formed by bottlebrush block copolymers (bBCPs) suspended in m-xylene as a model DIW ink formulation. We perform creep recovery measurements over a wide range of stresses, closely resembling the printing conditions, to map out the transient responses of recoverable and unrecoverable contributions. The resultant recovery material metrics consisting of the recoverable modulus and the flow viscosity are compared favorably to the predictions of a previously developed constitutive model. We discuss the concept of “printability” in terms of recovery rheology to provide a firm set of rheological criteria for successful printing outcomes. These criteria are distinct from criteria typically quoted in the literature. The present findings provide new insights into understanding the rheological phenomena involved in the DIW printing process and the requirements for obtaining self-standing structures.