Benzene Tetraamide: A Covalent Supramolecular Dual Motif in Dynamic Covalent Polymer Networks

Huiyi Zhang, Annemiek van Hertrooij, Tobias Schnitzer, Yinjun Chen, Soumabrata Majumdar, Rolf A.T.M. van Benthem, Rint P. Sijbesma (Corresponding author), Johan P.A. Heuts (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaten (Scopus)
25 Downloads (Pure)

Samenvatting

In dynamic polyamide networks, 1,2,4,5-benzene tetraamide (B4A) units act simultaneously as a dynamic covalent cross-linker and as supramolecular stacking motif. This results in materials with a rubbery plateau modulus that is about 20 times higher than that of a corresponding reference network in which the supramolecular interaction is suppressed. In branched polyamides with the same B4A dynamic motif, hydrogen bonding and stacking lead to strong and reversible supramolecular networks, whereas a branched polyamide with the nonstacking reference linker is a viscous liquid under the same conditions. Wide-angle X-ray scattering and variable-temperature infrared experiments confirm that covalent cross-linking and stacking cooperatively contribute to the dynamics of the network. Stress relaxation in the reference network is dominated by a single mode related to the dynamic covalent chemistry, whereas relaxation in the B4A network has additional modes assigned to the stacking dynamics.

Originele taal-2Engels
Pagina's (van-tot)6452-6460
Aantal pagina's9
TijdschriftMacromolecules
Volume56
Nummer van het tijdschrift16
DOI's
StatusGepubliceerd - 22 aug. 2023

Bibliografische nota

Funding Information:
This work was funded by the Dutch Research Council (NWO), Project No. 731.016.202.

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