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 N00: Poster Session II (11am-2pm PST)
11:00 AM,
Wednesday, March 8, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: N00.00018 : Polymer-particle interfacial effect on the bond exchange rate of vitrimer composites*
Presenter:
Jaehyun Cho
(Georgia Institute of Technology)
Authors:
Jaehyun Cho
(Georgia Institute of Technology)
Binoy Maiti
(Georgia Institute of Technology)
M.G. Finn
(Georgia Institute of Technology)
Blair Brettmann
(Georgia Institute of Technology)
In order to understand the bulk reprocessability of multicomponent composite systems, we need to deconvolute the interfacial effect of polymer-particle interface from bulk polymer-polymer domains. We designed mechanically resilient and reprocessable polymer composites by introducing surface-functionalized silica particles as a dual tunable moiety. We modify the surface of particles with functionalities that allow them to dynamically crosslink into the network themselves and study the kinetics of crosslinking and degradation. We use Aza-Michael adducts with the silica particles modified to have amine surface functional groups. The trimethylolpropane triacrylate (TMPTA) and various molecular amine crosslinkers form a dynamic covalent crosslinking network and particles are added that also bond with the resin through the additional Aza-Michael reaction. We examine how the functionalized particles affect not only the bond exchange rates of the composites but also detect how the polymer-particle interface impacts the overall bond exchange rates and mechanical properties. In addition to the insights gained by designing new composite systems with dynamically bonding particles, our studies of polymer-particle and polymer-polymer interfaces will play a large role in moving this work towards applications.
*MULTIDISCIPLINARY UNIVERSITY RESEARCH INITIATIVES (MURI) PROGRAM funded by ONR
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