2017
DOI: 10.1021/jacs.7b08826
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Abstract: Here we introduce silyl ether linkage as a novel dynamic covalent motif for dynamic material design. Through introduction of a neighboring amino moiety, we show that the silyl ether exchange rate can be accelerated by almost three orders of magnitude. By incorporating such silyl ether linkages into covalently cross-linked polymer networks, we demonstrate dynamic covalent network polymers displaying both malleability and reprocessability. The malleability of the networks is studied by monitoring stress relaxati… Show more

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Cited by 394 publications
(405 citation statements)
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“…Si−O bond exchange can also be utilized in silyl ether based materials . In 2017, the Guan group reported thermally stable vitrimeric materials with silyl ether linkages in the network .…”
Section: Si−o Exchange In Siloxanes and Silyl Ethersmentioning
confidence: 99%
“…Si−O bond exchange can also be utilized in silyl ether based materials . In 2017, the Guan group reported thermally stable vitrimeric materials with silyl ether linkages in the network .…”
Section: Si−o Exchange In Siloxanes and Silyl Ethersmentioning
confidence: 99%
“…[1][2][3] Thec ross-linking density of av itrimer influences its thermal and mechanical properties:f or example,h igher network density increases the probability that cross-links will interact and be involved in bond-exchange reactions,w hich impact the dynamics of vitrimer reconfigurability across multiple length scales and therefore its rheology. Theenergetics of bond-exchange reactions have been studied for vitrimers undergoing uncatalyzed or catalyzed transesterification, [4][5][6] transcarbamoylation, [7][8][9][10] olefin metathesis, [11] boronic ester exchange, [12][13][14] siloxane exchange, [15,16] triazo-lium transalkylation, [17] imine bond exchange, [18,19] ketoenamine exchange, [20][21][22] and diketoenamine exchange. [23] However,there is alack of understanding of how conformational degrees of freedom available to the network influence av itrimerst hermal and rheological behavior in and out of equilibrium.…”
mentioning
confidence: 99%
“…[27] Furthermore,t he ability of silyl ethers to undergo migration reactions may unmask phenol and catechol species at the adhesive interface during curing at high temperatures. [28] Ring-opening polymerization of benzoxazines produces backbone phenols that may act as potential acceptors to facilitate silyl ether migration. Partial deprotection of catechols and silyl ether migration in amodel precursor was observed after heating on an aluminum surface (see Supporting Information, Figure S25).…”
Section: Lap-shear Adhesion Testingmentioning
confidence: 99%