Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J04: Dynamic Polymer Networks II
3:00 PM–5:36 PM,
Tuesday, March 16, 2021
Sponsoring
Units:
DPOLY DSOFT
Chair: Christopher Evans, University of Illinois at Urbana-Champaign
Abstract: J04.00001 : Molecular Control over Vitrimer-like Mechanics – Tuneable Dynamic Motifs based on the Hammett Equation in Polyimine Materials*
3:00 PM–3:12 PM
Live
Presenter:
Maarten Smulders
(Laboratory of Organic Chemistry, Wageningen University)
Authors:
Sybren Schoustra
(Laboratory of Organic Chemistry, Wageningen University)
Han Zuilhof
(Laboratory of Organic Chemistry, Wageningen University)
Joshua Dijksman
(Laboratory of Physical Chemistry and Soft Matter, Wageningen University)
Maarten Smulders
(Laboratory of Organic Chemistry, Wageningen University)
Five tuneable, crosslinked polyimine network materials, derived from dianiline monomers with varying Hammett parameter (σ) were studied by rheology. We found a distinct, often linear correlation between the σ value and a range of dynamic material properties, including the kinetic activation energy for the imine bond exchange, the creep behaviour, the glass transition and topology freezing temperature. As a result, it was possible to tune the dynamic mechanical and thermal properties of dynamic covalent polyimines via the electronic effect of dianiline monomers based on the Hammett equation.
Lastly, the dynamic nature of the imine bond enabled recycling and intrinsic self-healing of the materials over multiple cycles without any external input.
*The Netherlands Organization for Scientific Research (NWO) is thanked for funding.
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