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Hydrogen Atom
Transfer-Triggered Chemical Recycling
of Commercial Poly(methyl methacrylate) Utilizing Continuous Monomer
Removal
Matylda Szewczyk-Łagodzińska (16803994)
Ferdinando De Luca Bossa (11867999)
Yanzhe Fang (25135088)
Jakub Józiewicz (25135091)
Halil Ibrahim Coskun (20770097)
Krzysztof Matyjaszewski (1247034)
Biophysics
Biochemistry
Cell Biology
Physiology
Biotechnology
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Inorganic Chemistry
triggered chemical recycling
key design principles
hydrogen atom transfer
efficient chemical recycling
total chp loading
chp loading ),
unmodified commercial poly
method remained effective
continuous monomer removal
continuous removal
commercial poly
monomer consumption
unit concentration
successfully repolymerized
pmma ).
methyl methacrylate
high dilution
chlorinated solvents
5 mol
20 g
We report a thermal hydrogen atom transfer (HAT) depolymerization
strategy for the efficient chemical recycling of unmodified commercial
poly(methyl methacrylate) (PMMA). A reaction engineering approach
combining controlled radical concentration with continuous monomer
removal enables efficient depolymerization under practical conditions
without light, chlorinated solvents, or high dilution. A semibatch
protocol employing multiple small additions of cumene hydroperoxide
(CHP) and continuous removal of methyl methacrylate (MMA) suppressed
radical side reactions and shifted the equilibrium toward monomer
formation. At a repeating-unit concentration of 1.83 M and a total
CHP loading of 3 mol %, depolymerization reached 90% with only 2%
monomer consumption. The method remained effective at 3.00 M, scaled
to 20 g of polymer (79% depolymerization, 4.5 mol % CHP loading),
and was effective for commercial Plexiglas containing stabilizing
additives. Recovered MMA was successfully repolymerized, demonstrating
its circularity. These results establish radical concentration control
and continuous monomer removal as the key design principles for hydroperoxide-assisted
thermal HAT depolymerization.
2026-09-29T00:00:00Z
Text
Journal contribution
10.1021/acsmacrolett.6c00454.s001
https://figshare.com/articles/journal_contribution/Hydrogen_Atom_Transfer-Triggered_Chemical_Recycling_of_Commercial_Poly_methyl_methacrylate_Utilizing_Continuous_Monomer_Removal/34021085
CC BY-NC 4.0