Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 219, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201700356
Keywords
decarboxylation; long-wavelength initiation; nonaqueous solvents; photopolymerization; quantum dots
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Funding
- TUBITAK [115Z463]
- Koc University [SF.00018]
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Photoexcitation of luminescent semiconductor quantum dots (QDs) generates an electron-hole pair, which can be utilized for photoinitiation of radical polymerization reactions. Here, oleic acid coated CdS QDs (CdS-OA) are demonstrated as successful photoinitiators in the absence of a protic solvent or a hole scavenger for the first time. This provides photopolymerization of hydrophobic methyl methacrylate in toluene, providing colloidal and strongly luminescent CdS/poly(methacrylic acid) (PMMA) hybrid structures with improved stability of the CdS. Besides, successful photopolymerization of poly(ethylene glycol)diacrylate at different excitation windows (320-480 and 400-500 nm) is demonstrated. This indicates that CdS-OA can act as a long-wavelength initiator. Electron spin resonance (ESR) studies and control experiments suggest decarboxylation of the oleic acid as the initial source of the free radical. This method represents a unique and very simple way to create luminescent, small, stable, and colloidal QD/polymer hybrids.
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