| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Real Time Quantification of Shear-induced Molecular Ordering in Direct Write Printing of Bottlebrush Based Polymer Networks |
| Author(s) |
Daniel A. Rau, Baiqiang Huang, Liheng Cai |
| On-Site Speaker (Planned) |
Daniel A. Rau |
| Abstract Scope |
Bottlebrush polymer networks provide a new class of inks with extreme softness for Direct Ink Write. However, it remains a challenge to understand the effects of the extrusion process on the molecular ordering of bottlebrush polymers, which have a long linear backbone densely grafted by many relatively short linear side chains. Here, we leverage a customized extrusion system and use small and wide-angle x-ray scattering to quantify the molecular ordering of linear-bottlebrush-linear triblock copolymers in-situ. We discover that higher shear rates promote the alignment of the self-assembled microstructures resulting in much larger characteristic length scales. Moreover, the ordering profile across the nozzle diameter is highly correlated to the flow profile of the viscoelastic triblock copolymer inks. Our results provide insights into the previously unexplored processing-microstructure-mechanical property relationships of bottlebrush-based polymer networks and may provide a new avenue for printing single material structures with functionally graded mechanical properties. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |