ja9b12164_si_001.pdf (2.04 MB)
Download fileA Self-Cross-Linking Supramolecular Polymer Network Enabled by Crown-Ether-Based Molecular Recognition
journal contribution
posted on 2020-01-15, 22:29 authored by Lei Wang, Lin Cheng, Guangfeng Li, Kai Liu, Zhaoming Zhang, Peitong Li, Shengyi Dong, Wei Yu, Feihe Huang, Xuzhou YanSupramolecular
polymers based on host–guest molecular recognition
have emerged as promising platforms for the development of smart materials.
However, the studies on them are primarily conducted in solution and/or
in the gel state. In contrast, little is known about dynamic properties
and applications of supramolecular polymers in bulk. Herein, we present
a self-cross-linking supramolecular polymer network (SPN) as a model
system to understand the bulk properties controlled by noncovalent
interactions. Specifically, the SPN monomer is composed of two benzo-21-crown-7
(B21C7) host units and two dialkylammonium salt guest moieties on
a four-arm core, wherein complementary host–guest complexation
drives the formation of the SPN with [2]pseudorotaxane linkages between
B21C7 and ammonium motifs. The dynamic and reversible behaviors of
the linkages are evaluated by measurement of viscoelasticity. The
results indicate that the host–guest molecular recognition
becomes highly dynamic at elevated temperature. Moreover, the relatively
high activation energy of the SPN manifests itself as a new type of
thermoplastic material with network topology freezing glass transition.
Finally, we demonstrate how these findings provide insights into the
malleability and processability of the SPN by simple demos. The fundamental
understanding gained from the research on this SPN in bulk will facilitate
the advancement and application of supramolecular materials.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
noncovalent interactionsself-cross-linking supramolecular polymer networknetwork topologySPN monomersupramolecular polymersdialkylammonium salt guest moietiesfour-arm coreSPN manifestsglass transitionsupramolecular materialsB 21C host unitsbenzo -21-crownB 21CCrown-Ether-Based Molecular Recognition Supramolecular polymersbulk propertiesammonium motifsSelf-Cross-Linking Supramolecular Polymer Network Enabledgel statemodel systemactivation energy