Journal
ACS MACRO LETTERS
Volume 3, Issue 12, Pages 1235-1239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz500704y
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Funding
- EPSRC
- Homerton College
- University of Warwick
- University of Cambridge
- European Regional Development Fund (ERDF)
- EPSRC [EP/G004897/1, EP/I035579/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G004897/1, EP/I035579/1] Funding Source: researchfish
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Recyclable core shell (CS) nanogels based on L-proline-containing hydrophobic cores with a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) shell have been synthesized via a seeded precipitation polymerization process. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to verify the successful addition of the shell and investigate the thermoresponsive properties of the nanostructures. The catalytic activity of the nanogels was assessed in a model asymmetric aldol reaction, where an enhancement was observed with increasing temperature, attributed to the hydrophobic nature of the PNIPAM shell. However, when a nanogel was synthesized with core shell morphology based on a gradient of cross-linking density in the corona (GS), a dramatic drop in activity was observed at elevated temperatures: the collapse of the outer, lightly cross-linked, corona polymer chains appears to block access to the catalytic core. High activity and enantioselectivity were maintained in a number of recovery and reuse cycles, highlighting the recycling potential of these catalytic nanostructures.
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