Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q03: Programmed Responsive Polymers and Soft Matter II
3:00 PM–5:24 PM,
Wednesday, March 8, 2023
Room: Room 126
Sponsoring
Unit:
DPOLY
Chair: Liheng Cai, University of Virginia
Abstract: Q03.00007 : Towards Subcritical Phase Transitions in Liquid Crystalline Elastomers
4:12 PM–4:48 PM
Presenter:
Timothy White
(University of Colorado, Boulder)
Author:
Timothy White
(University of Colorado, Boulder)
One approach that we have taken toward realizing phase transitions in LCEs is molecular engineering of the mesogenic core in liquid crystalline monomers. Historically, many LCEs utilize a mesogen with three aromatic rings in the rigid core. Here, we demonstrate that using a mesogen with two aromatic rings reduces the energy input required for order disruption by reducing the strength of intermolecular interactions between mesogens. We show that the reduced magnitude of mesogen-mesogen interaction strength enables thermomechanical actuation at lower temperatures and faster rates as well as photomechanical actuation with higher magnitude strain generation and faster response times.
A second route we have taken toward achieving first order phase transitions is the incorporation of supramolecular bonds in LCEs. The work presented in this talk will highlight the use of mesogenic moieties that contain hydrogen-bonding carboxylic acid groups within the mesogenic monomer core. When incorporated in a crosslinked LCE, these supramolecular bonds dissociate at elevated temperatures. We couple this supramolecular bond dissociation with thermomechanical actuation to achieve faster, more efficient actuation as a result of reduced crosslink density during order disruption.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700