期刊
NANOSCALE
卷 10, 期 41, 页码 19254-19261出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr05476b
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资金
- National Natural Science Foundation of China [51503155, 51773156, 51703167]
- Natural Science Foundation of Jiangsu Province [BK20160384, BK20170412]
- Pujiang Program [16PJ1402400]
The capability to spatiotemporally regulate polymerization kinetics in response to dual external stimuli of light and magnetism offers exciting pathways to precisely manipulate polymer composition and sequence. Herein, we report a strategy that adopts snowman-shaped Fe3O4@aSiO(2)-click-ZnPTPP Janus nanocomposites with a high magnetization value (12.9 emu g(-1)) and stably confined but accessible catalytic metalloporphyrin moieties as the nanocatalysts for photo-induced electron transfer reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. This method enables the synthesis of diverse polymeric structures from a large range of monomers using ultralow concentrations of nanocatalysts (less than 10 ppm) with simple modulation of light and magnetism. In addition, the nanocatalysts are found to be oxygen-tolerant, and they exhibit non-agglomeration during polymerization. Finally, repeated regeneration of the used nanocatalysts by magnetic extraction or facile centrifugation effectively reduces or even eliminates the contamination and/or decomposition on the final polymer products.
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