Journal
ACS MACRO LETTERS
Volume 9, Issue 1, Pages 7-13Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.9b00891
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Funding
- Center for Light Energy-Activated Redox Processes (LEAP), an Energy, Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001059]
- NASA Ames Research Center Grant [NNA04CC36G]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- MRSEC Program at the Materials Research Center [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the TIN
- National Science Foundation [DGE-1324585]
- American Australian Association Dow Chemical Company Fellowship
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This Letter describes the use of CdSe quantum dots (QDs) as photocatalysts for photoinduced electron transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization of a series of aqueous acrylamides and acrylates. The high colloidal solubility and photostability of these QDs allowed polymerization to occur with high efficiency (>90% conversion in 2.5 h), low dispersity (PDI < 1.1), and ultralow catalyst loading (<0.5 ppm). The use of protein concentrators enabled the removal of the photocatalyst from the polymer and monomer with tolerable metal contamination (8.41 ug/g). These isolated QDs could be recycled for four separate polymerizations without a significant decrease in efficiency. By changing the pore size of the protein concentrators, the QDs and polymer could be separated from the remaining monomer, allowing for the synthesis of block copolymers using a single batch of QDs with minimal purification steps and demonstrating the fidelity of chain ends.
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