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Heterogeneous photocatalytic polymerization has emerged as a successful method for the development of greener reversible deactivation radical polymerization protocols. In this article, a halogen-free covalent organic framework (1,3,6,8-tetrakis(4-aminophenyl) pyrene-1,3,6,8-tetrakis(4-formylphenyl) pyrene-covalent organic framework [TAPPy-TFPPy-COF]) based on imine bonds was prepared, which mediated reversible complexation-mediated polymerization of methacrylates for the synthesis of various polymers with controllable molecular weight and relatively uniform distribution under white light-emitting diode light irradiation. TAPPy-TFPPy-COF absorbed the energy from photo and was transformed to excited state (COF.), and then the energy transfer occurred between COF. and initiator 2-iodo-2-methylpropionitrile (CP-I), which cleaved the carbon-iodine bond of CP-I to generate carbon radicals, thereby initiating the polymerization reaction. The density function theory calculation suggests that the coordination of iodine of CP-I with nitrogen on TAPPy-TFPPy-COF significant decrease the bond dissociation energy, making the polymerization more efficiency. The monomer conversion and reaction time showed a linear kinetic relationship of first order. The number average molecular weight of the obtained polymers increased along with the monomer conversion rate, and in good agreement with theoretical molecular weight, indicating a high frequency of the activation-deactivation cycle. The obtained polymer has high chain end fidelity, which can be used to synthesize various block copolymers. This work provided a new di-rection for the development of heterogeneous catalysts for reversible complexation-mediated polymerization. (c) 2022 Elsevier Ltd. All rights reserved.
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MATERIALS TODAY CHEMISTRY
ISSN: 2468-5194
Year: 2022
Volume: 26
7 . 3
JCR@2022
6 . 7 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:91
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 3
SCOPUS Cited Count: 3
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2