AI Article Synopsis
- Chemical recycling of polymers using ATRP typically requires high temperatures (around 170 °C), which leads to high energy consumption and reduced depolymerization yields due to end-group deterioration.
- The introduction of initiators for continuous activator regeneration (ICAR) allows for significantly lower reaction temperatures, enabling depolymerization efficiency to increase from less than 1% to 96% at 120 °C.
- ICAR methodology has been shown to eliminate harmful side reactions at lower temperatures, is scalable up to 1 g, and is effective for both chlorine and bromine terminated polymers, working well with various catalysts.
Article Abstract
Chemical recycling of polymers synthesized by atom transfer radical polymerization (ATRP) typically requires high temperatures (i.e., 170 °C) to operate effectively, not only consuming unnecessary energy but also compromising depolymerization yields due to unavoidable end-group deterioration. To overcome this, the concept of initiators for continuous activator regeneration (ICAR) depolymerization is introduced herein as a broadly applicable approach to significantly reduce reaction temperatures for ATRP depolymerizations. Addition of commercially available free radical initiators enables the on-demand increase of depolymerization efficiency from <1% to 96%, achieving monomer generation at 120 °C, with conversions on par with thermal reversible addition-fragmentation chain transfer (RAFT) depolymerizations. Incubation studies confirm the elimination of deleterious side reactions at the milder temperatures employed, while the methodology can be scaled up to 1 g. The robustness and versatility of ICAR depolymerization is further demonstrated by the possibility to effectively depolymerize both chlorine and bromine terminated polymers and its compatibility with both copper and iron catalysts.
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| http://dx.doi.org/10.1021/jacs.4c13785 | DOI Listing |
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11673573 | PMC |
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