Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session N00: Poster Session II (11:30am-2:30pm CST)
11:30 AM,
Wednesday, March 6, 2024
Room: Hall BC
Sponsoring
Unit:
APS/SPS
Abstract: N00.00107 : Dynamic mechanical properties during formation and degradation of star polymer hydrogels*
Presenter:
Eleanor Quirk
(Stanford University)
Authors:
Eleanor Quirk
(Stanford University)
Michael C Burroughs
(Stanford University)
Brendan M Wirtz
(Stanford University)
Tracy H Schloemer
(Stanford University)
Daniel N Congreve
(Stanford University)
Danielle J Mai
(Stanford University)
Light-driven crosslinking and un-crosslinking of polymer networks has potential as a low-cost, low-energy, sustainable 3D printing technology. To study the effects of polymer architecture on network formation, we designed photo-reversible polymer networks comprising multi-arm star polyethylene glycol functionalized with anthracene (PEG-anthracene). PEG-anthracene undergoes crosslinking upon irradiation with ultraviolet light (UV, 365 nm) and un-crosslinking upon irradiation with deeper UV light (265 nm). The mechanical evolution of PEG-anthracene with 3, 4, 6, or 8 arms (5 kg/mol per arm) was compared using in situ dynamic rheology. During photocrosslinking, more arms generally led to quicker formation of stiffer materials. Higher polymer concentrations also led to stiffer materials, with less impact on the rate of crosslinking. During un-crosslinking, fewer arms and lower polymer concentrations generally led to the appearance of a “recycling window,” where samples exhibited more liquid-like behavior than solid-like behavior. This window enables the re-crosslinking of PEG-anthracene samples. Thus, we demonstrate polymer networks with built-in recyclability mechanisms and potential to improve the sustainability of 3D printing.
*Stanford Precourt Institute for Energy; ACS Petroleum Research Fund
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