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CO 2 ‐Strengthened Double‐Cross‐Linked Polymer Gels from Frustrated Lewis Pair Networks
Author(s) -
Liu Renjie,
Wang Yixin,
Yan Qiang
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000699
Subject(s) - covalent bond , supramolecular chemistry , polymer network , polymer , frustrated lewis pair , toughness , materials science , chemical bond , non covalent interactions , network covalent bonding , polymer science , nanotechnology , polymer chemistry , lewis acids and bases , chemistry , molecule , composite material , catalysis , hydrogen bond , organic chemistry
Conventional thermosets consisting of polymer networks with robust and irreversible chemical linkages are incapable of reshaping or reprocessing once formed. In contrast, reversible non‐covalent crosslinks can impart structurally flexible and reconfigurable feature to the networks, but at the expense of certain mechanical strength. The integration of fixed covalent bonds and noncovalent bonds into these materials can usually attain enhanced mechanical properties and meanwhile provide dynamic and adaptable functions, such as responsive and healing ability to external stimuli. Here a double‐cross‐linked frustrated Lewis pair network (FLPN) is developed through a specific three‐component reaction among triarylborane, triarylphosphine, and CO 2 , which is composed of permanent chemical crosslinks and dynamic CO 2 gas‐bridged connections. The amount of CO 2 added can regulate the density of supramolecular node in such FLPN, so as to control the strength and toughness of the gel material. Moreover, the broken gel can be rapidly healed by CO 2 stimulus through the reconstruction of dynamic covalent network. This study will inspire a new way to create gas‐based smart materials by incorporating frustrated Lewis pair chemistry into traditional gel system.