Journal
MACROMOLECULES
Volume 55, Issue 1, Pages 262-269Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.1c01737
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Funding
- National Natural Science Foundation of China [52033011, 51773229, 51873235]
- Scientific and Technological Program of Guangdong Province [2017A010103008]
- Natural Science Foundation of Guangdong Province [2018B030311017]
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A novel strategy utilizing reversible boronic ester bonds and imine bonds has been proposed for controllable depolymerization and recovery of polymer blends. Through the preparation of reversibly interlocked polymer networks (RILNs) from two preformed crosslinked polymers, a cascading effect between boronic ester bonds and imine bonds is enabled, allowing controlled depolymerization and recovery.
A novel strategy for controllable depolymerization and recovery of polymer blends is proposed. The core advance lies in the application of reversible boronic ester bonds and imine bonds, which possess the abilities of correlative scission and rebuilding. Accordingly, reversibly interlocked polymer networks (RILNs) are prepared from two preformed crosslinked polymers, which respectively carry the two reversible bonds. By taking advantage of the intimate packing of the macromolecules from the two networks in the RILNs, the cascading effect between boronic ester bonds and imine bonds is enabled. When the dimethylformamide swollen RILNs are triggered by a little water, the boronic ester bonds in one component network are decomposed, affording boronic acid, which subsequently catalyzes the cleavage of the adjacent imine bonds in the other component network. Meanwhile, scission of the imine bonds also promotes decomposition of the boronic ester bonds as well. The cascading processes can be reversed via dehydration-induced reformation of boronic ester bonds. Hence, RILNs are allowed to be depolymerized in a controlled manner and then recovered by removing the solvent and water.
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